/* Expand builtin functions.
Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
#define CALLED_AS_BUILT_IN(NODE) \
(!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
-/* Register mappings for target machines without register windows. */
-#ifndef INCOMING_REGNO
-#define INCOMING_REGNO(OUT) (OUT)
-#endif
-#ifndef OUTGOING_REGNO
-#define OUTGOING_REGNO(IN) (IN)
-#endif
-
#ifndef PAD_VARARGS_DOWN
#define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
#endif
tree built_in_decls[(int) END_BUILTINS];
/* Declarations used when constructing the builtin implicitly in the compiler.
It may be NULL_TREE when this is invalid (for instance runtime is not
- required to implement the function call in all cases. */
+ required to implement the function call in all cases). */
tree implicit_built_in_decls[(int) END_BUILTINS];
static int get_pointer_alignment (tree, unsigned int);
-static tree c_strlen (tree, int);
static const char *c_getstr (tree);
static rtx c_readstr (const char *, enum machine_mode);
static int target_char_cast (tree, char *);
static rtx result_vector (int, rtx);
#endif
static rtx expand_builtin_setjmp (tree, rtx);
+static void expand_builtin_update_setjmp_buf (rtx);
static void expand_builtin_prefetch (tree);
static rtx expand_builtin_apply_args (void);
static rtx expand_builtin_apply_args_1 (void);
static void expand_errno_check (tree, rtx);
static rtx expand_builtin_mathfn (tree, rtx, rtx);
static rtx expand_builtin_mathfn_2 (tree, rtx, rtx);
-static rtx expand_builtin_constant_p (tree, enum machine_mode);
+static rtx expand_builtin_mathfn_3 (tree, rtx, rtx);
static rtx expand_builtin_args_info (tree);
static rtx expand_builtin_next_arg (tree);
static rtx expand_builtin_va_start (tree);
static bool readonly_data_expr (tree);
static rtx expand_builtin_fabs (tree, rtx, rtx);
static rtx expand_builtin_cabs (tree, rtx);
-static tree fold_builtin_cabs (tree, tree, tree);
+static rtx expand_builtin_signbit (tree, rtx);
+static tree fold_builtin_cabs (tree, tree);
static tree fold_builtin_trunc (tree);
static tree fold_builtin_floor (tree);
static tree fold_builtin_ceil (tree);
+static tree fold_builtin_round (tree);
static tree fold_builtin_bitop (tree);
static tree fold_builtin_memcpy (tree);
static tree fold_builtin_mempcpy (tree);
static tree fold_builtin_memcmp (tree);
static tree fold_builtin_strcmp (tree);
static tree fold_builtin_strncmp (tree);
+static tree fold_builtin_signbit (tree);
+
+static tree simplify_builtin_memcmp (tree);
+static tree simplify_builtin_strcmp (tree);
+static tree simplify_builtin_strncmp (tree);
+static tree simplify_builtin_strpbrk (tree);
+static tree simplify_builtin_strstr (tree);
+static tree simplify_builtin_strchr (tree);
+static tree simplify_builtin_strrchr (tree);
+static tree simplify_builtin_strcat (tree);
+static tree simplify_builtin_strncat (tree);
+static tree simplify_builtin_strspn (tree);
+static tree simplify_builtin_strcspn (tree);
+static void simplify_builtin_next_arg (tree);
+static void simplify_builtin_va_start (tree);
+static tree simplify_builtin_sprintf (tree, int);
+
/* Return the alignment in bits of EXP, a pointer valued expression.
But don't return more than MAX_ALIGN no matter what.
Unfortunately, string_constant can't access the values of const char
arrays with initializers, so neither can we do so here. */
-static tree
+tree
c_strlen (tree src, int only_value)
{
tree offset_node;
len1 = c_strlen (TREE_OPERAND (src, 1), only_value);
len2 = c_strlen (TREE_OPERAND (src, 2), only_value);
- if (tree_int_cst_equal (len1, len2))
+ if (tree_int_cst_equal (len1, len2))
return len1;
}
return 0;
}
+/* Similar to save_expr, but assumes that arbitrary code is not executed
+ in between the multiple evaluations. In particular, we assume that a
+ non-addressable local variable will not be modified. */
+
+static tree
+builtin_save_expr (tree exp)
+{
+ if (TREE_ADDRESSABLE (exp) == 0
+ && (TREE_CODE (exp) == PARM_DECL
+ || (TREE_CODE (exp) == VAR_DECL && !TREE_STATIC (exp))))
+ return exp;
+
+ return save_expr (exp);
+}
+
/* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
times to get the address of either a higher stack frame, or a return
address located within it (depending on FNDECL_CODE). */
the buffer and use the rest of it for the stack save area, which
is machine-dependent. */
-#ifndef BUILTIN_SETJMP_FRAME_VALUE
-#define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
-#endif
-
mem = gen_rtx_MEM (Pmode, buf_addr);
set_mem_alias_set (mem, setjmp_alias_set);
- emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
+ emit_move_insn (mem, targetm.builtin_setjmp_frame_value ());
mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
set_mem_alias_set (mem, setjmp_alias_set);
}
}
+/* Expand a call to __builtin_nonlocal_goto. We're passed the target label
+ and the address of the save area. */
+
+static rtx
+expand_builtin_nonlocal_goto (tree arglist)
+{
+ tree t_label, t_save_area;
+ rtx r_label, r_save_area, r_fp, r_sp, insn;
+
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return NULL_RTX;
+
+ t_label = TREE_VALUE (arglist);
+ arglist = TREE_CHAIN (arglist);
+ t_save_area = TREE_VALUE (arglist);
+
+ r_label = expand_expr (t_label, NULL_RTX, VOIDmode, 0);
+ r_save_area = expand_expr (t_save_area, NULL_RTX, VOIDmode, 0);
+ r_fp = gen_rtx_MEM (Pmode, r_save_area);
+ r_sp = gen_rtx_MEM (STACK_SAVEAREA_MODE (SAVE_NONLOCAL),
+ plus_constant (r_save_area, GET_MODE_SIZE (Pmode)));
+
+ current_function_has_nonlocal_goto = 1;
+
+#if HAVE_nonlocal_goto
+ /* ??? We no longer need to pass the static chain value, afaik. */
+ if (HAVE_nonlocal_goto)
+ emit_insn (gen_nonlocal_goto (const0_rtx, r_label, r_sp, r_fp));
+ else
+#endif
+ {
+ r_label = copy_to_reg (r_label);
+
+ emit_insn (gen_rtx_CLOBBER (VOIDmode,
+ gen_rtx_MEM (BLKmode,
+ gen_rtx_SCRATCH (VOIDmode))));
+
+ emit_insn (gen_rtx_CLOBBER (VOIDmode,
+ gen_rtx_MEM (BLKmode,
+ hard_frame_pointer_rtx)));
+
+ /* Restore frame pointer for containing function.
+ This sets the actual hard register used for the frame pointer
+ to the location of the function's incoming static chain info.
+ The non-local goto handler will then adjust it to contain the
+ proper value and reload the argument pointer, if needed. */
+ emit_move_insn (hard_frame_pointer_rtx, r_fp);
+ emit_stack_restore (SAVE_NONLOCAL, r_sp, NULL_RTX);
+
+ /* USE of hard_frame_pointer_rtx added for consistency;
+ not clear if really needed. */
+ emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
+ emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
+ emit_indirect_jump (r_label);
+ }
+
+ /* Search backwards to the jump insn and mark it as a
+ non-local goto. */
+ for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
+ {
+ if (GET_CODE (insn) == JUMP_INSN)
+ {
+ REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO,
+ const0_rtx, REG_NOTES (insn));
+ break;
+ }
+ else if (GET_CODE (insn) == CALL_INSN)
+ break;
+ }
+
+ return const0_rtx;
+}
+
+/* __builtin_update_setjmp_buf is passed a pointer to an array of five words
+ (not all will be used on all machines) that was passed to __builtin_setjmp.
+ It updates the stack pointer in that block to correspond to the current
+ stack pointer. */
+
+static void
+expand_builtin_update_setjmp_buf (rtx buf_addr)
+{
+ enum machine_mode sa_mode = Pmode;
+ rtx stack_save;
+
+
+#ifdef HAVE_save_stack_nonlocal
+ if (HAVE_save_stack_nonlocal)
+ sa_mode = insn_data[(int) CODE_FOR_save_stack_nonlocal].operand[0].mode;
+#endif
+#ifdef STACK_SAVEAREA_MODE
+ sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
+#endif
+
+ stack_save
+ = gen_rtx_MEM (sa_mode,
+ memory_address
+ (sa_mode,
+ plus_constant (buf_addr, 2 * GET_MODE_SIZE (Pmode))));
+
+#ifdef HAVE_setjmp
+ if (HAVE_setjmp)
+ emit_insn (gen_setjmp ());
+#endif
+
+ emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
+}
+
/* Expand a call to __builtin_prefetch. For a target that does not support
data prefetch, evaluate the memory address argument in case it has side
effects. */
used for calling a function. */
static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
-/* Return the offset of register REGNO into the block returned by
- __builtin_apply_args. This is not declared static, since it is
- needed in objc-act.c. */
-
-int
-apply_args_register_offset (int regno)
-{
- apply_args_size ();
-
- /* Arguments are always put in outgoing registers (in the argument
- block) if such make sense. */
-#ifdef OUTGOING_REGNO
- regno = OUTGOING_REGNO (regno);
-#endif
- return apply_args_reg_offset[regno];
-}
-
/* Return the size required for the block returned by __builtin_apply_args,
and initialize apply_args_mode. */
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (FUNCTION_ARG_REGNO_P (regno))
{
- /* Search for the proper mode for copying this register's
- value. I'm not sure this is right, but it works so far. */
- enum machine_mode best_mode = VOIDmode;
-
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
- mode != VOIDmode;
- mode = GET_MODE_WIDER_MODE (mode))
- if (HARD_REGNO_MODE_OK (regno, mode)
- && HARD_REGNO_NREGS (regno, mode) == 1)
- best_mode = mode;
-
- if (best_mode == VOIDmode)
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
- mode != VOIDmode;
- mode = GET_MODE_WIDER_MODE (mode))
- if (HARD_REGNO_MODE_OK (regno, mode)
- && have_insn_for (SET, mode))
- best_mode = mode;
-
- if (best_mode == VOIDmode)
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
- mode != VOIDmode;
- mode = GET_MODE_WIDER_MODE (mode))
- if (HARD_REGNO_MODE_OK (regno, mode)
- && have_insn_for (SET, mode))
- best_mode = mode;
-
- if (best_mode == VOIDmode)
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
- mode != VOIDmode;
- mode = GET_MODE_WIDER_MODE (mode))
- if (HARD_REGNO_MODE_OK (regno, mode)
- && have_insn_for (SET, mode))
- best_mode = mode;
-
- mode = best_mode;
+ mode = reg_raw_mode[regno];
+
if (mode == VOIDmode)
abort ();
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (FUNCTION_VALUE_REGNO_P (regno))
{
- /* Search for the proper mode for copying this register's
- value. I'm not sure this is right, but it works so far. */
- enum machine_mode best_mode = VOIDmode;
-
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
- mode != TImode;
- mode = GET_MODE_WIDER_MODE (mode))
- if (HARD_REGNO_MODE_OK (regno, mode))
- best_mode = mode;
-
- if (best_mode == VOIDmode)
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
- mode != VOIDmode;
- mode = GET_MODE_WIDER_MODE (mode))
- if (HARD_REGNO_MODE_OK (regno, mode)
- && have_insn_for (SET, mode))
- best_mode = mode;
-
- if (best_mode == VOIDmode)
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
- mode != VOIDmode;
- mode = GET_MODE_WIDER_MODE (mode))
- if (HARD_REGNO_MODE_OK (regno, mode)
- && have_insn_for (SET, mode))
- best_mode = mode;
-
- if (best_mode == VOIDmode)
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
- mode != VOIDmode;
- mode = GET_MODE_WIDER_MODE (mode))
- if (HARD_REGNO_MODE_OK (regno, mode)
- && have_insn_for (SET, mode))
- best_mode = mode;
-
- mode = best_mode;
+ mode = reg_raw_mode[regno];
+
if (mode == VOIDmode)
abort ();
NULL_RTX);
#endif
emit_move_insn (adjust_address (registers, Pmode, 0), tem);
-
+
size = GET_MODE_SIZE (Pmode);
/* Save the structure value address unless this is passed as an
}
/* All arguments and registers used for the call are set up by now! */
- function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
+ function = prepare_call_address (function, NULL, &call_fusage, 0, 0);
/* Ensure address is valid. SYMBOL_REF is already valid, so no need,
and we don't want to load it into a register as an optimization,
return GEN_INT (no_type_class);
}
-/* Expand expression EXP, which is a call to __builtin_constant_p. */
-
-static rtx
-expand_builtin_constant_p (tree arglist, enum machine_mode target_mode)
-{
- rtx tmp;
-
- if (arglist == 0)
- return const0_rtx;
- arglist = TREE_VALUE (arglist);
-
- /* We have taken care of the easy cases during constant folding. This
- case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE
- get a chance to see if it can deduce whether ARGLIST is constant.
- If CSE isn't going to run, of course, don't bother waiting. */
-
- if (cse_not_expected)
- return const0_rtx;
-
- current_function_calls_constant_p = 1;
-
- tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
- tmp = gen_rtx_CONSTANT_P_RTX (target_mode, tmp);
- return tmp;
-}
-
/* This helper macro, meant to be used in mathfn_built_in below,
determines which among a set of three builtin math functions is
appropriate for a given type mode. The `F' and `L' cases are
tree
mathfn_built_in (tree type, enum built_in_function fn)
{
- const enum machine_mode type_mode = TYPE_MODE (type);
enum built_in_function fcode, fcodef, fcodel;
switch (fn)
return 0;
}
- if (type_mode == TYPE_MODE (double_type_node))
+ if (TYPE_MAIN_VARIANT (type) == double_type_node)
return implicit_built_in_decls[fcode];
- else if (type_mode == TYPE_MODE (float_type_node))
+ else if (TYPE_MAIN_VARIANT (type) == float_type_node)
return implicit_built_in_decls[fcodef];
- else if (type_mode == TYPE_MODE (long_double_type_node))
+ else if (TYPE_MAIN_VARIANT (type) == long_double_type_node)
return implicit_built_in_decls[fcodel];
else
return 0;
}
-/* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
+/* Expand a call to one of the builtin math functions (sqrt, exp, or log).
Return 0 if a normal call should be emitted rather than expanding the
function in-line. EXP is the expression that is a call to the builtin
function; if convenient, the result should be placed in TARGET.
switch (DECL_FUNCTION_CODE (fndecl))
{
- case BUILT_IN_SIN:
- case BUILT_IN_SINF:
- case BUILT_IN_SINL:
- builtin_optab = sin_optab; break;
- case BUILT_IN_COS:
- case BUILT_IN_COSF:
- case BUILT_IN_COSL:
- builtin_optab = cos_optab; break;
case BUILT_IN_SQRT:
case BUILT_IN_SQRTF:
case BUILT_IN_SQRTL:
case BUILT_IN_EXPF:
case BUILT_IN_EXPL:
errno_set = true; builtin_optab = exp_optab; break;
+ case BUILT_IN_EXP10:
+ case BUILT_IN_EXP10F:
+ case BUILT_IN_EXP10L:
+ case BUILT_IN_POW10:
+ case BUILT_IN_POW10F:
+ case BUILT_IN_POW10L:
+ errno_set = true; builtin_optab = exp10_optab; break;
+ case BUILT_IN_EXP2:
+ case BUILT_IN_EXP2F:
+ case BUILT_IN_EXP2L:
+ errno_set = true; builtin_optab = exp2_optab; break;
+ case BUILT_IN_EXPM1:
+ case BUILT_IN_EXPM1F:
+ case BUILT_IN_EXPM1L:
+ errno_set = true; builtin_optab = expm1_optab; break;
+ case BUILT_IN_LOGB:
+ case BUILT_IN_LOGBF:
+ case BUILT_IN_LOGBL:
+ errno_set = true; builtin_optab = logb_optab; break;
+ case BUILT_IN_ILOGB:
+ case BUILT_IN_ILOGBF:
+ case BUILT_IN_ILOGBL:
+ errno_set = true; builtin_optab = ilogb_optab; break;
case BUILT_IN_LOG:
case BUILT_IN_LOGF:
case BUILT_IN_LOGL:
errno_set = true; builtin_optab = log_optab; break;
+ case BUILT_IN_LOG10:
+ case BUILT_IN_LOG10F:
+ case BUILT_IN_LOG10L:
+ errno_set = true; builtin_optab = log10_optab; break;
+ case BUILT_IN_LOG2:
+ case BUILT_IN_LOG2F:
+ case BUILT_IN_LOG2L:
+ errno_set = true; builtin_optab = log2_optab; break;
+ case BUILT_IN_LOG1P:
+ case BUILT_IN_LOG1PF:
+ case BUILT_IN_LOG1PL:
+ errno_set = true; builtin_optab = log1p_optab; break;
+ case BUILT_IN_ASIN:
+ case BUILT_IN_ASINF:
+ case BUILT_IN_ASINL:
+ builtin_optab = asin_optab; break;
+ case BUILT_IN_ACOS:
+ case BUILT_IN_ACOSF:
+ case BUILT_IN_ACOSL:
+ builtin_optab = acos_optab; break;
case BUILT_IN_TAN:
case BUILT_IN_TANF:
case BUILT_IN_TANL:
/* Wrap the computation of the argument in a SAVE_EXPR, as we may
need to expand the argument again. This way, we will not perform
side-effects more the once. */
- narg = save_expr (arg);
+ narg = builtin_save_expr (arg);
if (narg != arg)
{
arglist = build_tree_list (NULL_TREE, arg);
case BUILT_IN_ATAN2F:
case BUILT_IN_ATAN2L:
builtin_optab = atan2_optab; break;
+ case BUILT_IN_FMOD:
+ case BUILT_IN_FMODF:
+ case BUILT_IN_FMODL:
+ builtin_optab = fmod_optab; break;
+ case BUILT_IN_DREM:
+ case BUILT_IN_DREMF:
+ case BUILT_IN_DREML:
+ builtin_optab = drem_optab; break;
default:
abort ();
}
if (! flag_errno_math || ! HONOR_NANS (mode))
errno_set = false;
- /* Alway stabilize the argument list. */
- narg = save_expr (arg1);
+ /* Always stabilize the argument list. */
+ narg = builtin_save_expr (arg1);
if (narg != arg1)
{
temp = build_tree_list (NULL_TREE, narg);
else
temp = TREE_CHAIN (arglist);
- narg = save_expr (arg0);
+ narg = builtin_save_expr (arg0);
if (narg != arg0)
{
arglist = tree_cons (NULL_TREE, narg, temp);
return target;
}
+/* Expand a call to the builtin sin and cos math functions.
+ Return 0 if a normal call should be emitted rather than expanding the
+ function in-line. EXP is the expression that is a call to the builtin
+ function; if convenient, the result should be placed in TARGET.
+ SUBTARGET may be used as the target for computing one of EXP's
+ operands. */
+
+static rtx
+expand_builtin_mathfn_3 (tree exp, rtx target, rtx subtarget)
+{
+ optab builtin_optab;
+ rtx op0, insns, before_call;
+ tree fndecl = get_callee_fndecl (exp);
+ tree arglist = TREE_OPERAND (exp, 1);
+ enum machine_mode mode;
+ bool errno_set = false;
+ tree arg, narg;
+
+ if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
+
+ arg = TREE_VALUE (arglist);
+
+ switch (DECL_FUNCTION_CODE (fndecl))
+ {
+ case BUILT_IN_SIN:
+ case BUILT_IN_SINF:
+ case BUILT_IN_SINL:
+ case BUILT_IN_COS:
+ case BUILT_IN_COSF:
+ case BUILT_IN_COSL:
+ builtin_optab = sincos_optab; break;
+ default:
+ abort ();
+ }
+
+ /* Make a suitable register to place result in. */
+ mode = TYPE_MODE (TREE_TYPE (exp));
+
+ if (! flag_errno_math || ! HONOR_NANS (mode))
+ errno_set = false;
+
+ /* Check if sincos insn is available, otherwise fallback
+ to sin or cos insn. */
+ if (builtin_optab->handlers[(int) mode].insn_code == CODE_FOR_nothing) {
+ switch (DECL_FUNCTION_CODE (fndecl))
+ {
+ case BUILT_IN_SIN:
+ case BUILT_IN_SINF:
+ case BUILT_IN_SINL:
+ builtin_optab = sin_optab; break;
+ case BUILT_IN_COS:
+ case BUILT_IN_COSF:
+ case BUILT_IN_COSL:
+ builtin_optab = cos_optab; break;
+ default:
+ abort();
+ }
+ }
+
+ /* Before working hard, check whether the instruction is available. */
+ if (builtin_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
+ {
+ target = gen_reg_rtx (mode);
+
+ /* Wrap the computation of the argument in a SAVE_EXPR, as we may
+ need to expand the argument again. This way, we will not perform
+ side-effects more the once. */
+ narg = save_expr (arg);
+ if (narg != arg)
+ {
+ arglist = build_tree_list (NULL_TREE, arg);
+ exp = build_function_call_expr (fndecl, arglist);
+ }
+
+ op0 = expand_expr (arg, subtarget, VOIDmode, 0);
+
+ emit_queue ();
+ start_sequence ();
+
+ /* Compute into TARGET.
+ Set TARGET to wherever the result comes back. */
+ if (builtin_optab == sincos_optab)
+ {
+ switch (DECL_FUNCTION_CODE (fndecl))
+ {
+ case BUILT_IN_SIN:
+ case BUILT_IN_SINF:
+ case BUILT_IN_SINL:
+ if (!expand_twoval_unop (builtin_optab, op0, 0, target, 0))
+ abort();
+ break;
+ case BUILT_IN_COS:
+ case BUILT_IN_COSF:
+ case BUILT_IN_COSL:
+ if (!expand_twoval_unop (builtin_optab, op0, target, 0, 0))
+ abort();
+ break;
+ default:
+ abort();
+ }
+ }
+ else
+ {
+ target = expand_unop (mode, builtin_optab, op0, target, 0);
+ }
+
+ if (target != 0)
+ {
+ if (errno_set)
+ expand_errno_check (exp, target);
+
+ /* Output the entire sequence. */
+ insns = get_insns ();
+ end_sequence ();
+ emit_insn (insns);
+ return target;
+ }
+
+ /* If we were unable to expand via the builtin, stop the sequence
+ (without outputting the insns) and call to the library function
+ with the stabilized argument list. */
+ end_sequence ();
+ }
+
+ before_call = get_last_insn ();
+
+ target = expand_call (exp, target, target == const0_rtx);
+
+ return target;
+}
+
/* To evaluate powi(x,n), the floating point value x raised to the
constant integer exponent n, we use a hybrid algorithm that
combines the "window method" with look-up tables. For an
multiplications to inline before calling the system library's pow
function. powi(x,n) requires at worst 2*bits(n)-2 multiplications,
so this default never requires calling pow, powf or powl. */
-
+
#ifndef POWI_MAX_MULTS
#define POWI_MAX_MULTS (2*HOST_BITS_PER_WIDE_INT-2)
#endif
result++;
}
}
-
+
return result + powi_lookup_cost (val, cache);
}
/* Expand the RTL to evaluate powi(x,n) in mode MODE. X is the
floating point operand in mode MODE, and N is the exponent. This
function needs to be kept in sync with powi_cost above. */
-
+
static rtx
expand_powi (rtx x, enum machine_mode mode, HOST_WIDE_INT n)
{
}
}
}
- return expand_builtin_mathfn_2 (exp, target, NULL_RTX);
+
+ if (! flag_unsafe_math_optimizations)
+ return NULL_RTX;
+ return expand_builtin_mathfn_2 (exp, target, subtarget);
}
/* Expand expression EXP which is a call to the strlen builtin. Return 0
return const0_rtx;
/* Return an offset into the constant string argument. */
- return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
- s1, convert (TREE_TYPE (s1),
- ssize_int (r - p1)))),
+ return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1), s1,
+ fold_convert (TREE_TYPE (s1),
+ ssize_int (r - p1)))),
target, mode, EXPAND_NORMAL);
}
return const0_rtx;
/* Return an offset into the constant string argument. */
- return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
- s1, convert (TREE_TYPE (s1),
- ssize_int (r - p1)))),
+ return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1), s1,
+ fold_convert (TREE_TYPE (s1),
+ ssize_int (r - p1)))),
target, mode, EXPAND_NORMAL);
}
return const0_rtx;
/* Return an offset into the constant string argument. */
- return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
- s1, convert (TREE_TYPE (s1),
- ssize_int (r - p1)))),
+ return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1), s1,
+ fold_convert (TREE_TYPE (s1),
+ ssize_int (r - p1)))),
target, mode, EXPAND_NORMAL);
}
return const0_rtx;
/* Return an offset into the constant string argument. */
- return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
- s1, convert (TREE_TYPE (s1),
- ssize_int (r - p1)))),
+ return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1), s1,
+ fold_convert (TREE_TYPE (s1),
+ ssize_int (r - p1)))),
target, mode, EXPAND_NORMAL);
}
if (endp == 2)
len = fold (build (MINUS_EXPR, TREE_TYPE (len), dest,
integer_one_node));
- len = convert (TREE_TYPE (dest), len);
+ len = fold_convert (TREE_TYPE (dest), len);
expr = fold (build (PLUS_EXPR, TREE_TYPE (dest), dest, len));
return expand_expr (expr, target, mode, EXPAND_NORMAL);
}
/* If LEN is not constant, call the normal function. */
if (! host_integerp (len, 1))
return 0;
-
+
/* If the LEN parameter is zero, return DEST. */
if (tree_low_cst (len, 1) == 0)
{
so that if it isn't expanded inline, we fallback to
calling bcopy instead of memmove. */
- newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
+ newarglist = build_tree_list (NULL_TREE, fold_convert (sizetype, size));
newarglist = tree_cons (NULL_TREE, src, newarglist);
newarglist = tree_cons (NULL_TREE, dest, newarglist);
so that if it isn't expanded inline, we fallback to
calling bzero instead of memset. */
- newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
+ newarglist = build_tree_list (NULL_TREE, fold_convert (sizetype, size));
newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
newarglist = tree_cons (NULL_TREE, dest, newarglist);
tree ind1 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
- build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
+ fold_convert (cst_uchar_ptr_node, arg1))));
tree ind2 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
- build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
+ fold_convert (cst_uchar_ptr_node, arg2))));
tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
return expand_expr (result, target, mode, EXPAND_NORMAL);
}
insn_mode = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
else
#endif
- return 0;
+ return 0;
/* If we don't have POINTER_TYPE, call the function. */
if (arg1_align == 0 || arg2_align == 0)
XEXP (arg1_rtx, 0), Pmode,
XEXP (arg2_rtx, 0), Pmode,
convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
- TREE_UNSIGNED (sizetype)),
+ TYPE_UNSIGNED (sizetype)),
TYPE_MODE (sizetype));
/* Return the value in the proper mode for this function. */
tree ind1 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
- build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
+ fold_convert (cst_uchar_ptr_node, arg1))));
tree ind2 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
- build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
+ fold_convert (cst_uchar_ptr_node, arg2))));
tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
return expand_expr (result, target, mode, EXPAND_NORMAL);
}
result = gen_reg_rtx (insn_mode);
/* Stabilize the arguments in case gen_cmpstrsi fails. */
- arg1 = save_expr (arg1);
- arg2 = save_expr (arg2);
+ arg1 = builtin_save_expr (arg1);
+ arg2 = builtin_save_expr (arg2);
arg1_rtx = get_memory_rtx (arg1);
arg2_rtx = get_memory_rtx (arg2);
tree ind1 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
- build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
+ fold_convert (cst_uchar_ptr_node, arg1))));
tree ind2 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
- build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
+ fold_convert (cst_uchar_ptr_node, arg2))));
tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
return expand_expr (result, target, mode, EXPAND_NORMAL);
}
result = gen_reg_rtx (insn_mode);
/* Stabilize the arguments in case gen_cmpstrsi fails. */
- arg1 = save_expr (arg1);
- arg2 = save_expr (arg2);
- len = save_expr (len);
+ arg1 = builtin_save_expr (arg1);
+ arg2 = builtin_save_expr (arg2);
+ len = builtin_save_expr (len);
arg1_rtx = get_memory_rtx (arg1);
arg2_rtx = get_memory_rtx (arg2);
pieces into (dst + strlen(dst)). */
tree newdst, arglist,
strlen_fn = implicit_built_in_decls[BUILT_IN_STRLEN];
-
+
/* This is the length argument. */
arglist = build_tree_list (NULL_TREE,
fold (size_binop (PLUS_EXPR,
ssize_int (1))));
/* Prepend src argument. */
arglist = tree_cons (NULL_TREE, src, arglist);
-
+
/* We're going to use dst more than once. */
- dst = save_expr (dst);
+ dst = builtin_save_expr (dst);
/* Create strlen (dst). */
newdst =
/* Prepend the new dst argument. */
arglist = tree_cons (NULL_TREE, newdst, arglist);
-
+
/* We don't want to get turned into a memcpy if the
target is const0_rtx, i.e. when the return value
isn't used. That would produce pessimized code so
tree p2 = build_pointer_type (va_list_type_node);
valist = build1 (ADDR_EXPR, p2, valist);
- valist = fold (build1 (NOP_EXPR, p1, valist));
+ valist = fold_convert (p1, valist);
}
}
else
tree align, alignm1;
tree rounded_size;
rtx addr;
+ HOST_WIDE_INT boundary;
/* Compute the rounded size of the type. */
align = size_int (PARM_BOUNDARY / BITS_PER_UNIT);
alignm1 = size_int (PARM_BOUNDARY / BITS_PER_UNIT - 1);
+ boundary = FUNCTION_ARG_BOUNDARY (TYPE_MODE (type), type);
+
+ /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
+ requires greater alignment, we must perform dynamic alignment. */
+
+ if (boundary > PARM_BOUNDARY)
+ {
+ if (!PAD_VARARGS_DOWN)
+ {
+ t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
+ build (PLUS_EXPR, TREE_TYPE (valist), valist,
+ build_int_2 (boundary / BITS_PER_UNIT - 1, 0)));
+ TREE_SIDE_EFFECTS (t) = 1;
+ expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
+ }
+ t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
+ build (BIT_AND_EXPR, TREE_TYPE (valist), valist,
+ build_int_2 (~(boundary / BITS_PER_UNIT - 1), -1)));
+ TREE_SIDE_EFFECTS (t) = 1;
+ expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
+ }
if (type == error_mark_node
|| (type_size = TYPE_SIZE_UNIT (TYPE_MAIN_VARIANT (type))) == NULL
|| TREE_OVERFLOW (type_size))
/* Generate a diagnostic for requesting data of a type that cannot
be passed through `...' due to type promotion at the call site. */
- else if ((promoted_type = (*lang_hooks.types.type_promotes_to) (type))
+ else if ((promoted_type = lang_hooks.types.type_promotes_to (type))
!= type)
{
const char *name = "<anonymous type>", *pname = 0;
/* We can, however, treat "undefined" any way we please.
Call abort to encourage the user to fix the program. */
+ inform ("if this code is reached, the program will abort");
expand_builtin_trap ();
/* This is dead code, but go ahead and finish so that the
{
tree valist = TREE_VALUE (arglist);
-#ifdef EXPAND_BUILTIN_VA_END
- valist = stabilize_va_list (valist, 0);
- EXPAND_BUILTIN_VA_END (arglist);
-#else
/* Evaluate for side effects, if needed. I hate macros that don't
do that. */
if (TREE_SIDE_EFFECTS (valist))
expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
-#endif
return const0_rtx;
}
rtx op0;
rtx result;
+ /* In -fmudflap-instrumented code, alloca() and __builtin_alloca()
+ should always expand to function calls. These can be intercepted
+ in libmudflap. */
+ if (flag_mudflap)
+ return 0;
+
if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
return 0;
break;
}
}
- /* FALLTHROUGH */
+ /* Fall through. */
case 1: /* length is greater than 1, call fwrite. */
{
tree string_arg;
if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
&& (integer_zerop (arg1) || integer_onep (arg1)))
{
- int num_jumps = 0;
- int save_pending_stack_adjust = pending_stack_adjust;
- rtx insn;
-
- /* If we fail to locate an appropriate conditional jump, we'll
- fall back to normal evaluation. Ensure that the expression
- can be re-evaluated. */
- switch (unsafe_for_reeval (arg0))
- {
- case 0: /* Safe. */
- break;
-
- case 1: /* Mildly unsafe. */
- arg0 = unsave_expr (arg0);
- break;
-
- case 2: /* Wildly unsafe. */
- return NULL_RTX;
- }
+ rtx insn, drop_through_label, temp;
/* Expand the jump insns. */
start_sequence ();
do_jump (arg0, if_false_label, if_true_label);
ret = get_insns ();
+
+ drop_through_label = get_last_insn ();
+ if (drop_through_label && GET_CODE (drop_through_label) == NOTE)
+ drop_through_label = prev_nonnote_insn (drop_through_label);
+ if (drop_through_label && GET_CODE (drop_through_label) != CODE_LABEL)
+ drop_through_label = NULL_RTX;
end_sequence ();
- /* For mildly unsafe builtin jump's, if unsave_expr_now
- creates a new tree instead of changing the old one
- TREE_VALUE (arglist) needs to be updated. */
- if (arg0 != TREE_VALUE (arglist)
- && TREE_CODE (arg0) == UNSAVE_EXPR
- && TREE_OPERAND (arg0, 0) != TREE_VALUE (arglist))
- TREE_VALUE (arglist) = TREE_OPERAND (arg0, 0);
-
- /* Now that the __builtin_expect has been validated, go through and add
- the expect's to each of the conditional jumps. If we run into an
- error, just give up and generate the 'safe' code of doing a SCC
- operation and then doing a branch on that. */
+ if (! if_true_label)
+ if_true_label = drop_through_label;
+ if (! if_false_label)
+ if_false_label = drop_through_label;
+
+ /* Go through and add the expect's to each of the conditional jumps. */
insn = ret;
while (insn != NULL_RTX)
{
if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn))
{
rtx ifelse = SET_SRC (pc_set (insn));
- rtx label;
- int taken;
-
- if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
+ rtx then_dest = XEXP (ifelse, 1);
+ rtx else_dest = XEXP (ifelse, 2);
+ int taken = -1;
+
+ /* First check if we recognize any of the labels. */
+ if (GET_CODE (then_dest) == LABEL_REF
+ && XEXP (then_dest, 0) == if_true_label)
+ taken = 1;
+ else if (GET_CODE (then_dest) == LABEL_REF
+ && XEXP (then_dest, 0) == if_false_label)
+ taken = 0;
+ else if (GET_CODE (else_dest) == LABEL_REF
+ && XEXP (else_dest, 0) == if_false_label)
+ taken = 1;
+ else if (GET_CODE (else_dest) == LABEL_REF
+ && XEXP (else_dest, 0) == if_true_label)
+ taken = 0;
+ /* Otherwise check where we drop through. */
+ else if (else_dest == pc_rtx)
{
- taken = 1;
- label = XEXP (XEXP (ifelse, 1), 0);
- }
- /* An inverted jump reverses the probabilities. */
- else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
- {
- taken = 0;
- label = XEXP (XEXP (ifelse, 2), 0);
+ if (next && GET_CODE (next) == NOTE)
+ next = next_nonnote_insn (next);
+
+ if (next && GET_CODE (next) == JUMP_INSN
+ && any_uncondjump_p (next))
+ temp = XEXP (SET_SRC (pc_set (next)), 0);
+ else
+ temp = next;
+
+ /* TEMP is either a CODE_LABEL, NULL_RTX or something
+ else that can't possibly match either target label. */
+ if (temp == if_false_label)
+ taken = 1;
+ else if (temp == if_true_label)
+ taken = 0;
}
- /* We shouldn't have to worry about conditional returns during
- the expansion stage, but handle it gracefully anyway. */
- else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
+ else if (then_dest == pc_rtx)
{
- taken = 1;
- label = NULL_RTX;
+ if (next && GET_CODE (next) == NOTE)
+ next = next_nonnote_insn (next);
+
+ if (next && GET_CODE (next) == JUMP_INSN
+ && any_uncondjump_p (next))
+ temp = XEXP (SET_SRC (pc_set (next)), 0);
+ else
+ temp = next;
+
+ if (temp == if_false_label)
+ taken = 0;
+ else if (temp == if_true_label)
+ taken = 1;
}
- /* An inverted return reverses the probabilities. */
- else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
+
+ if (taken != -1)
{
- taken = 0;
- label = NULL_RTX;
+ /* If the test is expected to fail, reverse the
+ probabilities. */
+ if (integer_zerop (arg1))
+ taken = 1 - taken;
+ predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
}
- else
- goto do_next_insn;
-
- /* If the test is expected to fail, reverse the
- probabilities. */
- if (integer_zerop (arg1))
- taken = 1 - taken;
-
- /* If we are jumping to the false label, reverse the
- probabilities. */
- if (label == NULL_RTX)
- ; /* conditional return */
- else if (label == if_false_label)
- taken = 1 - taken;
- else if (label != if_true_label)
- goto do_next_insn;
-
- num_jumps++;
- predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
}
- do_next_insn:
insn = next;
}
-
- /* If no jumps were modified, fail and do __builtin_expect the normal
- way. */
- if (num_jumps == 0)
- {
- ret = NULL_RTX;
- pending_stack_adjust = save_pending_stack_adjust;
- }
}
return ret;
type = build_array_type (elem, index);
TREE_TYPE (t) = type;
TREE_CONSTANT (t) = 1;
+ TREE_INVARIANT (t) = 1;
TREE_READONLY (t) = 1;
TREE_STATIC (t) = 1;
/* Expand a call to printf or printf_unlocked with argument list ARGLIST.
Return 0 if a normal call should be emitted rather than transforming
the function inline. If convenient, the result should be placed in
- TARGET with mode MODE. UNLOCKED indicates this is a printf_unlocked
+ TARGET with mode MODE. UNLOCKED indicates this is a printf_unlocked
call. */
static rtx
expand_builtin_printf (tree arglist, rtx target, enum machine_mode mode,
{
/* Create a NUL-terminated string that's one char shorter
than the original, stripping off the trailing '\n'. */
- char *newstr = (char *) alloca (len);
+ char *newstr = alloca (len);
memcpy (newstr, fmt_str, len - 1);
newstr[len - 1] = 0;
/* Expand a call to fprintf or fprintf_unlocked with argument list ARGLIST.
Return 0 if a normal call should be emitted rather than transforming
the function inline. If convenient, the result should be placed in
- TARGET with mode MODE. UNLOCKED indicates this is a fprintf_unlocked
+ TARGET with mode MODE. UNLOCKED indicates this is a fprintf_unlocked
call. */
static rtx
expand_builtin_fprintf (tree arglist, rtx target, enum machine_mode mode,
if (target == const0_rtx)
return const0_rtx;
exp = build_int_2 (strlen (fmt_str), 0);
- exp = fold (build1 (NOP_EXPR, integer_type_node, exp));
+ exp = fold_convert (integer_type_node, exp);
return expand_expr (exp, target, mode, EXPAND_NORMAL);
}
/* If the format is "%s", use strcpy if the result isn't used. */
return 0;
}
+
+/* Expand a call to either the entry or exit function profiler. */
+
+static rtx
+expand_builtin_profile_func (bool exitp)
+{
+ rtx this, which;
+
+ this = DECL_RTL (current_function_decl);
+ if (GET_CODE (this) == MEM)
+ this = XEXP (this, 0);
+ else
+ abort ();
+
+ if (exitp)
+ which = profile_function_exit_libfunc;
+ else
+ which = profile_function_entry_libfunc;
+
+ emit_library_call (which, LCT_NORMAL, VOIDmode, 2, this, Pmode,
+ expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS,
+ 0, hard_frame_pointer_rtx),
+ Pmode);
+
+ return const0_rtx;
+}
+
+/* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT. */
+
+static rtx
+round_trampoline_addr (rtx tramp)
+{
+ rtx temp, addend, mask;
+
+ /* If we don't need too much alignment, we'll have been guaranteed
+ proper alignment by get_trampoline_type. */
+ if (TRAMPOLINE_ALIGNMENT <= STACK_BOUNDARY)
+ return tramp;
+
+ /* Round address up to desired boundary. */
+ temp = gen_reg_rtx (Pmode);
+ addend = GEN_INT (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1);
+ mask = GEN_INT (-TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
+
+ temp = expand_simple_binop (Pmode, PLUS, tramp, addend,
+ temp, 0, OPTAB_LIB_WIDEN);
+ tramp = expand_simple_binop (Pmode, AND, temp, mask,
+ temp, 0, OPTAB_LIB_WIDEN);
+
+ return tramp;
+}
+
+static rtx
+expand_builtin_init_trampoline (tree arglist)
+{
+ tree t_tramp, t_func, t_chain;
+ rtx r_tramp, r_func, r_chain;
+#ifdef TRAMPOLINE_TEMPLATE
+ rtx blktramp;
+#endif
+
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE,
+ POINTER_TYPE, VOID_TYPE))
+ return NULL_RTX;
+
+ t_tramp = TREE_VALUE (arglist);
+ arglist = TREE_CHAIN (arglist);
+ t_func = TREE_VALUE (arglist);
+ arglist = TREE_CHAIN (arglist);
+ t_chain = TREE_VALUE (arglist);
+
+ r_tramp = expand_expr (t_tramp, NULL_RTX, VOIDmode, 0);
+ r_func = expand_expr (t_func, NULL_RTX, VOIDmode, 0);
+ r_chain = expand_expr (t_chain, NULL_RTX, VOIDmode, 0);
+
+ /* Generate insns to initialize the trampoline. */
+ r_tramp = round_trampoline_addr (r_tramp);
+#ifdef TRAMPOLINE_TEMPLATE
+ blktramp = gen_rtx_MEM (BLKmode, r_tramp);
+ set_mem_align (blktramp, TRAMPOLINE_ALIGNMENT);
+ emit_block_move (blktramp, assemble_trampoline_template (),
+ GEN_INT (TRAMPOLINE_SIZE), BLOCK_OP_NORMAL);
+#endif
+ trampolines_created = 1;
+ INITIALIZE_TRAMPOLINE (r_tramp, r_func, r_chain);
+
+ return const0_rtx;
+}
+
+static rtx
+expand_builtin_adjust_trampoline (tree arglist)
+{
+ rtx tramp;
+
+ if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
+ return NULL_RTX;
+
+ tramp = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
+ tramp = round_trampoline_addr (tramp);
+#ifdef TRAMPOLINE_ADJUST_ADDRESS
+ TRAMPOLINE_ADJUST_ADDRESS (tramp);
+#endif
+
+ return tramp;
+}
+
+/* Expand a call to the built-in signbit, signbitf or signbitl function.
+ Return NULL_RTX if a normal call should be emitted rather than expanding
+ the function in-line. EXP is the expression that is a call to the builtin
+ function; if convenient, the result should be placed in TARGET. */
+
+static rtx
+expand_builtin_signbit (tree exp, rtx target)
+{
+ const struct real_format *fmt;
+ enum machine_mode fmode, imode, rmode;
+ HOST_WIDE_INT hi, lo;
+ tree arg, arglist;
+ int bitpos;
+ rtx temp;
+
+ arglist = TREE_OPERAND (exp, 1);
+ if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
+
+ arg = TREE_VALUE (arglist);
+ fmode = TYPE_MODE (TREE_TYPE (arg));
+ rmode = TYPE_MODE (TREE_TYPE (exp));
+ fmt = REAL_MODE_FORMAT (fmode);
+
+ /* For floating point formats without a sign bit, implement signbit
+ as "ARG < 0.0". */
+ if (fmt->signbit < 0)
+ {
+ /* But we can't do this if the format supports signed zero. */
+ if (fmt->has_signed_zero && HONOR_SIGNED_ZEROS (fmode))
+ return 0;
+
+ arg = fold (build (LT_EXPR, TREE_TYPE (exp), arg,
+ build_real (TREE_TYPE (arg), dconst0)));
+ return expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
+ }
+
+ imode = int_mode_for_mode (fmode);
+ if (imode == BLKmode)
+ return 0;
+
+ bitpos = fmt->signbit;
+ /* Handle targets with different FP word orders. */
+ if (FLOAT_WORDS_BIG_ENDIAN != WORDS_BIG_ENDIAN)
+ {
+ int nwords = GET_MODE_BITSIZE (fmode) / BITS_PER_WORD;
+ int word = nwords - (bitpos / BITS_PER_WORD) - 1;
+ bitpos = word * BITS_PER_WORD + bitpos % BITS_PER_WORD;
+ }
+
+ /* If the sign bit is not in the lowpart and the floating point format
+ is wider than an integer, check that is twice the size of an integer
+ so that we can use gen_highpart below. */
+ if (bitpos >= GET_MODE_BITSIZE (rmode)
+ && GET_MODE_BITSIZE (imode) != 2 * GET_MODE_BITSIZE (rmode))
+ return 0;
+
+ temp = expand_expr (arg, NULL_RTX, VOIDmode, 0);
+ temp = gen_lowpart (imode, temp);
+
+ if (GET_MODE_BITSIZE (imode) > GET_MODE_BITSIZE (rmode))
+ {
+ if (BYTES_BIG_ENDIAN)
+ bitpos = GET_MODE_BITSIZE (imode) - 1 - bitpos;
+ temp = copy_to_mode_reg (imode, temp);
+ temp = extract_bit_field (temp, 1, bitpos, 1,
+ NULL_RTX, rmode, rmode,
+ GET_MODE_SIZE (imode));
+ }
+ else
+ {
+ if (GET_MODE_BITSIZE (imode) < GET_MODE_BITSIZE (rmode))
+ temp = gen_lowpart (rmode, temp);
+ if (bitpos < HOST_BITS_PER_WIDE_INT)
+ {
+ hi = 0;
+ lo = (HOST_WIDE_INT) 1 << bitpos;
+ }
+ else
+ {
+ hi = (HOST_WIDE_INT) 1 << (bitpos - HOST_BITS_PER_WIDE_INT);
+ lo = 0;
+ }
+
+ temp = force_reg (rmode, temp);
+ temp = expand_binop (rmode, and_optab, temp,
+ immed_double_const (lo, hi, rmode),
+ target, 1, OPTAB_LIB_WIDEN);
+ }
+ return temp;
+}
+
+/* Expand fork or exec calls. TARGET is the desired target of the
+ call. ARGLIST is the list of arguments of the call. FN is the
+ identificator of the actual function. IGNORE is nonzero if the
+ value is to be ignored. */
+
+static rtx
+expand_builtin_fork_or_exec (tree fn, tree arglist, rtx target, int ignore)
+{
+ tree id, decl;
+ tree call;
+
+ /* If we are not profiling, just call the function. */
+ if (!profile_arc_flag)
+ return NULL_RTX;
+
+ /* Otherwise call the wrapper. This should be equivalent for the rest of
+ compiler, so the code does not diverge, and the wrapper may run the
+ code necessary for keeping the profiling sane. */
+
+ switch (DECL_FUNCTION_CODE (fn))
+ {
+ case BUILT_IN_FORK:
+ id = get_identifier ("__gcov_fork");
+ break;
+
+ case BUILT_IN_EXECL:
+ id = get_identifier ("__gcov_execl");
+ break;
+
+ case BUILT_IN_EXECV:
+ id = get_identifier ("__gcov_execv");
+ break;
+
+ case BUILT_IN_EXECLP:
+ id = get_identifier ("__gcov_execlp");
+ break;
+
+ case BUILT_IN_EXECLE:
+ id = get_identifier ("__gcov_execle");
+ break;
+
+ case BUILT_IN_EXECVP:
+ id = get_identifier ("__gcov_execvp");
+ break;
+
+ case BUILT_IN_EXECVE:
+ id = get_identifier ("__gcov_execve");
+ break;
+
+ default:
+ abort ();
+ }
+
+ decl = build_decl (FUNCTION_DECL, id, TREE_TYPE (fn));
+ DECL_EXTERNAL (decl) = 1;
+ TREE_PUBLIC (decl) = 1;
+ DECL_ARTIFICIAL (decl) = 1;
+ TREE_NOTHROW (decl) = 1;
+ call = build_function_call_expr (decl, arglist);
+
+ return expand_call (call, target, ignore);
+}
\f
/* Expand an expression EXP that calls a built-in function,
with result going to TARGET if that's convenient
emit_queue ();
if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
- return (*targetm.expand_builtin) (exp, target, subtarget, mode, ignore);
+ return targetm.expand_builtin (exp, target, subtarget, mode, ignore);
/* When not optimizing, generate calls to library functions for a certain
set of builtins. */
and IMAGPART_EXPR. */
abort ();
- case BUILT_IN_SIN:
- case BUILT_IN_SINF:
- case BUILT_IN_SINL:
- case BUILT_IN_COS:
- case BUILT_IN_COSF:
- case BUILT_IN_COSL:
case BUILT_IN_EXP:
case BUILT_IN_EXPF:
case BUILT_IN_EXPL:
+ case BUILT_IN_EXP10:
+ case BUILT_IN_EXP10F:
+ case BUILT_IN_EXP10L:
+ case BUILT_IN_POW10:
+ case BUILT_IN_POW10F:
+ case BUILT_IN_POW10L:
+ case BUILT_IN_EXP2:
+ case BUILT_IN_EXP2F:
+ case BUILT_IN_EXP2L:
+ case BUILT_IN_EXPM1:
+ case BUILT_IN_EXPM1F:
+ case BUILT_IN_EXPM1L:
+ case BUILT_IN_LOGB:
+ case BUILT_IN_LOGBF:
+ case BUILT_IN_LOGBL:
+ case BUILT_IN_ILOGB:
+ case BUILT_IN_ILOGBF:
+ case BUILT_IN_ILOGBL:
case BUILT_IN_LOG:
case BUILT_IN_LOGF:
case BUILT_IN_LOGL:
+ case BUILT_IN_LOG10:
+ case BUILT_IN_LOG10F:
+ case BUILT_IN_LOG10L:
+ case BUILT_IN_LOG2:
+ case BUILT_IN_LOG2F:
+ case BUILT_IN_LOG2L:
+ case BUILT_IN_LOG1P:
+ case BUILT_IN_LOG1PF:
+ case BUILT_IN_LOG1PL:
case BUILT_IN_TAN:
case BUILT_IN_TANF:
case BUILT_IN_TANL:
+ case BUILT_IN_ASIN:
+ case BUILT_IN_ASINF:
+ case BUILT_IN_ASINL:
+ case BUILT_IN_ACOS:
+ case BUILT_IN_ACOSF:
+ case BUILT_IN_ACOSL:
case BUILT_IN_ATAN:
case BUILT_IN_ATANF:
case BUILT_IN_ATANL:
case BUILT_IN_POW:
case BUILT_IN_POWF:
case BUILT_IN_POWL:
- if (! flag_unsafe_math_optimizations)
- break;
target = expand_builtin_pow (exp, target, subtarget);
if (target)
return target;
case BUILT_IN_ATAN2:
case BUILT_IN_ATAN2F:
case BUILT_IN_ATAN2L:
+ case BUILT_IN_FMOD:
+ case BUILT_IN_FMODF:
+ case BUILT_IN_FMODL:
+ case BUILT_IN_DREM:
+ case BUILT_IN_DREMF:
+ case BUILT_IN_DREML:
if (! flag_unsafe_math_optimizations)
break;
target = expand_builtin_mathfn_2 (exp, target, subtarget);
return target;
break;
+ case BUILT_IN_SIN:
+ case BUILT_IN_SINF:
+ case BUILT_IN_SINL:
+ case BUILT_IN_COS:
+ case BUILT_IN_COSF:
+ case BUILT_IN_COSL:
+ if (! flag_unsafe_math_optimizations)
+ break;
+ target = expand_builtin_mathfn_3 (exp, target, subtarget);
+ if (target)
+ return target;
+ break;
+
case BUILT_IN_APPLY_ARGS:
return expand_builtin_apply_args ();
/* Return the address of the first anonymous stack arg. */
case BUILT_IN_NEXT_ARG:
+ simplify_builtin_next_arg (arglist);
return expand_builtin_next_arg (arglist);
case BUILT_IN_CLASSIFY_TYPE:
return expand_builtin_classify_type (arglist);
case BUILT_IN_CONSTANT_P:
- return expand_builtin_constant_p (arglist, target_mode);
+ return const0_rtx;
case BUILT_IN_FRAME_ADDRESS:
case BUILT_IN_RETURN_ADDRESS:
return target;
break;
+ case BUILT_IN_STACK_ALLOC:
+ expand_stack_alloc (TREE_VALUE (arglist),
+ TREE_VALUE (TREE_CHAIN (arglist)));
+ return const0_rtx;
+
+ case BUILT_IN_STACK_SAVE:
+ return expand_stack_save ();
+
+ case BUILT_IN_STACK_RESTORE:
+ expand_stack_restore (TREE_VALUE (arglist));
+ return const0_rtx;
+
case BUILT_IN_FFS:
case BUILT_IN_FFSL:
case BUILT_IN_FFSLL:
return const0_rtx;
}
+ case BUILT_IN_NONLOCAL_GOTO:
+ target = expand_builtin_nonlocal_goto (arglist);
+ if (target)
+ return target;
+ break;
+
+ /* This updates the setjmp buffer that is its argument with the value
+ of the current stack pointer. */
+ case BUILT_IN_UPDATE_SETJMP_BUF:
+ if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
+ {
+ rtx buf_addr
+ = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
+
+ expand_builtin_update_setjmp_buf (buf_addr);
+ return const0_rtx;
+ }
+ break;
+
case BUILT_IN_TRAP:
expand_builtin_trap ();
return const0_rtx;
if (target)
return target;
break;
-
case BUILT_IN_FPUTS_UNLOCKED:
target = expand_builtin_fputs (arglist, target, true);
if (target)
return target;
break;
+ case BUILT_IN_SIGNBIT:
+ case BUILT_IN_SIGNBITF:
+ case BUILT_IN_SIGNBITL:
+ target = expand_builtin_signbit (exp, target);
+ if (target)
+ return target;
+ break;
+
/* Various hooks for the DWARF 2 __throw routine. */
case BUILT_IN_UNWIND_INIT:
expand_builtin_unwind_init ();
case BUILT_IN_EH_RETURN_DATA_REGNO:
return expand_builtin_eh_return_data_regno (arglist);
#endif
+ case BUILT_IN_EXTEND_POINTER:
+ return expand_builtin_extend_pointer (TREE_VALUE (arglist));
+
case BUILT_IN_VA_START:
case BUILT_IN_STDARG_START:
return expand_builtin_va_start (arglist);
expand_builtin_prefetch (arglist);
return const0_rtx;
+ case BUILT_IN_PROFILE_FUNC_ENTER:
+ return expand_builtin_profile_func (false);
+ case BUILT_IN_PROFILE_FUNC_EXIT:
+ return expand_builtin_profile_func (true);
+
+ case BUILT_IN_INIT_TRAMPOLINE:
+ return expand_builtin_init_trampoline (arglist);
+ case BUILT_IN_ADJUST_TRAMPOLINE:
+ return expand_builtin_adjust_trampoline (arglist);
+
+ case BUILT_IN_FORK:
+ case BUILT_IN_EXECL:
+ case BUILT_IN_EXECV:
+ case BUILT_IN_EXECLP:
+ case BUILT_IN_EXECLE:
+ case BUILT_IN_EXECVP:
+ case BUILT_IN_EXECVE:
+ target = expand_builtin_fork_or_exec (fndecl, arglist, target, ignore);
+ if (target)
+ return target;
+ break;
default: /* just do library call, if unknown builtin */
if (!DECL_ASSEMBLER_NAME_SET_P (fndecl))
return 0;
}
+/* Fold a call to __builtin_expect, if we expect that a comparison against
+ the argument will fold to a constant. In practice, this means a true
+ constant or the address of a non-weak symbol. ARGLIST is the argument
+ list of the call. */
+
+static tree
+fold_builtin_expect (tree arglist)
+{
+ tree arg, inner;
+
+ if (arglist == 0)
+ return 0;
+
+ arg = TREE_VALUE (arglist);
+
+ /* If the argument isn't invariant, then there's nothing we can do. */
+ if (!TREE_INVARIANT (arg))
+ return 0;
+
+ /* If we're looking at an address of a weak decl, then do not fold. */
+ inner = arg;
+ STRIP_NOPS (inner);
+ if (TREE_CODE (inner) == ADDR_EXPR)
+ {
+ do
+ {
+ inner = TREE_OPERAND (inner, 0);
+ }
+ while (TREE_CODE (inner) == COMPONENT_REF
+ || TREE_CODE (inner) == ARRAY_REF);
+ if (DECL_P (inner) && DECL_WEAK (inner))
+ return 0;
+ }
+
+ /* Otherwise, ARG already has the proper type for the return value. */
+ return arg;
+}
+
/* Fold a call to __builtin_classify_type. */
static tree
case BUILT_IN_NEARBYINT:
case BUILT_IN_NEARBYINTF:
case BUILT_IN_NEARBYINTL:
+ case BUILT_IN_RINT:
+ case BUILT_IN_RINTF:
+ case BUILT_IN_RINTL:
case BUILT_IN_ROUND:
case BUILT_IN_ROUNDF:
case BUILT_IN_ROUNDL:
&& (decl = mathfn_built_in (newtype, fcode)))
{
arglist =
- build_tree_list (NULL_TREE, fold (convert (newtype, arg0)));
- return convert (ftype,
- build_function_call_expr (decl, arglist));
+ build_tree_list (NULL_TREE, fold_convert (newtype, arg0));
+ return fold_convert (ftype,
+ build_function_call_expr (decl, arglist));
+ }
+ }
+ return 0;
+}
+
+/* EXP is assumed to be builtin call which can narrow the FP type of
+ the argument, for instance lround((double)f) -> lroundf (f). */
+
+static tree
+fold_fixed_mathfn (tree exp)
+{
+ tree fndecl = get_callee_fndecl (exp);
+ tree arglist = TREE_OPERAND (exp, 1);
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ tree arg;
+
+ if (! validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
+
+ arg = TREE_VALUE (arglist);
+
+ /* If argument is already integer valued, and we don't need to worry
+ about setting errno, there's no need to perform rounding. */
+ if (! flag_errno_math && integer_valued_real_p (arg))
+ return fold (build1 (FIX_TRUNC_EXPR, TREE_TYPE (exp), arg));
+
+ if (optimize)
+ {
+ tree ftype = TREE_TYPE (arg);
+ tree arg0 = strip_float_extensions (arg);
+ tree newtype = TREE_TYPE (arg0);
+ tree decl;
+
+ if (TYPE_PRECISION (newtype) < TYPE_PRECISION (ftype)
+ && (decl = mathfn_built_in (newtype, fcode)))
+ {
+ arglist =
+ build_tree_list (NULL_TREE, fold_convert (newtype, arg0));
+ return build_function_call_expr (decl, arglist);
}
}
return 0;
}
-/* Fold function call to builtin cabs, cabsf or cabsl. FNDECL is the
- function's DECL, ARGLIST is the argument list and TYPE is the return
- type. Return NULL_TREE if no simplification can be made. */
+/* Fold function call to builtin cabs, cabsf or cabsl. ARGLIST
+ is the argument list and TYPE is the return type. Return
+ NULL_TREE if no if no simplification can be made. */
static tree
-fold_builtin_cabs (tree fndecl, tree arglist, tree type)
+fold_builtin_cabs (tree arglist, tree type)
{
tree arg;
if (flag_unsafe_math_optimizations)
{
- enum built_in_function fcode;
- tree sqrtfn;
-
- fcode = DECL_FUNCTION_CODE (fndecl);
- if (fcode == BUILT_IN_CABS)
- sqrtfn = implicit_built_in_decls[BUILT_IN_SQRT];
- else if (fcode == BUILT_IN_CABSF)
- sqrtfn = implicit_built_in_decls[BUILT_IN_SQRTF];
- else if (fcode == BUILT_IN_CABSL)
- sqrtfn = implicit_built_in_decls[BUILT_IN_SQRTL];
- else
- sqrtfn = NULL_TREE;
+ tree sqrtfn = mathfn_built_in (type, BUILT_IN_SQRT);
if (sqrtfn != NULL_TREE)
{
tree rpart, ipart, result, arglist;
- arg = save_expr (arg);
+ arg = builtin_save_expr (arg);
rpart = fold (build1 (REALPART_EXPR, type, arg));
ipart = fold (build1 (IMAGPART_EXPR, type, arg));
- rpart = save_expr (rpart);
- ipart = save_expr (ipart);
+ rpart = builtin_save_expr (rpart);
+ ipart = builtin_save_expr (ipart);
result = fold (build (PLUS_EXPR, type,
fold (build (MULT_EXPR, type,
return fold_trunc_transparent_mathfn (exp);
}
-/* Fold function call to builtin ffs, clz, ctz, popcount and parity
- and their long and long long variants (i.e. ffsl and ffsll).
- Return NULL_TREE if no simplification can be made. */
+/* Fold function call to builtin round, roundf or roundl. Return
+ NULL_TREE if no simplification can be made. */
static tree
-fold_builtin_bitop (tree exp)
+fold_builtin_round (tree exp)
{
- tree fndecl = get_callee_fndecl (exp);
tree arglist = TREE_OPERAND (exp, 1);
tree arg;
- if (! validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
- return NULL_TREE;
+ if (! validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
- /* Optimize for constant argument. */
+ /* Optimize round of constant value. */
arg = TREE_VALUE (arglist);
- if (TREE_CODE (arg) == INTEGER_CST && ! TREE_CONSTANT_OVERFLOW (arg))
+ if (TREE_CODE (arg) == REAL_CST && ! TREE_CONSTANT_OVERFLOW (arg))
{
- HOST_WIDE_INT hi, width, result;
- unsigned HOST_WIDE_INT lo;
- tree type, t;
+ REAL_VALUE_TYPE x;
- type = TREE_TYPE (arg);
- width = TYPE_PRECISION (type);
- lo = TREE_INT_CST_LOW (arg);
+ x = TREE_REAL_CST (arg);
+ if (! REAL_VALUE_ISNAN (x) || ! flag_errno_math)
+ {
+ tree type = TREE_TYPE (exp);
+ REAL_VALUE_TYPE r;
+
+ real_round (&r, TYPE_MODE (type), &x);
+ return build_real (type, r);
+ }
+ }
+
+ return fold_trunc_transparent_mathfn (exp);
+}
+
+/* Fold function call to builtin lround, lroundf or lroundl (or the
+ corresponding long long versions). Return NULL_TREE if no
+ simplification can be made. */
+
+static tree
+fold_builtin_lround (tree exp)
+{
+ tree arglist = TREE_OPERAND (exp, 1);
+ tree arg;
+
+ if (! validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
+
+ /* Optimize lround of constant value. */
+ arg = TREE_VALUE (arglist);
+ if (TREE_CODE (arg) == REAL_CST && ! TREE_CONSTANT_OVERFLOW (arg))
+ {
+ const REAL_VALUE_TYPE x = TREE_REAL_CST (arg);
+
+ if (! REAL_VALUE_ISNAN (x) && ! REAL_VALUE_ISINF (x))
+ {
+ tree itype = TREE_TYPE (exp), ftype = TREE_TYPE (arg), result;
+ HOST_WIDE_INT hi, lo;
+ REAL_VALUE_TYPE r;
+
+ real_round (&r, TYPE_MODE (ftype), &x);
+ REAL_VALUE_TO_INT (&lo, &hi, r);
+ result = build_int_2 (lo, hi);
+ if (int_fits_type_p (result, itype))
+ return fold_convert (itype, result);
+ }
+ }
+
+ return fold_fixed_mathfn (exp);
+}
+
+/* Fold function call to builtin ffs, clz, ctz, popcount and parity
+ and their long and long long variants (i.e. ffsl and ffsll).
+ Return NULL_TREE if no simplification can be made. */
+
+static tree
+fold_builtin_bitop (tree exp)
+{
+ tree fndecl = get_callee_fndecl (exp);
+ tree arglist = TREE_OPERAND (exp, 1);
+ tree arg;
+
+ if (! validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
+ return NULL_TREE;
+
+ /* Optimize for constant argument. */
+ arg = TREE_VALUE (arglist);
+ if (TREE_CODE (arg) == INTEGER_CST && ! TREE_CONSTANT_OVERFLOW (arg))
+ {
+ HOST_WIDE_INT hi, width, result;
+ unsigned HOST_WIDE_INT lo;
+ tree type, t;
+
+ type = TREE_TYPE (arg);
+ width = TYPE_PRECISION (type);
+ lo = TREE_INT_CST_LOW (arg);
/* Clear all the bits that are beyond the type's precision. */
if (width > HOST_BITS_PER_WIDE_INT)
}
/* A subroutine of fold_builtin to fold the various logarithmic
- functions. EXP is the CALL_EXPR of a call to a builtin log*
- function. VALUE is the base of the log* function. */
+ functions. EXP is the CALL_EXPR of a call to a builtin logN
+ function. VALUE is the base of the logN function. */
static tree
fold_builtin_logarithm (tree exp, const REAL_VALUE_TYPE *value)
tree type = TREE_TYPE (TREE_TYPE (fndecl));
tree arg = TREE_VALUE (arglist);
const enum built_in_function fcode = builtin_mathfn_code (arg);
-
- /* Optimize log*(1.0) = 0.0. */
+
+ /* Optimize logN(1.0) = 0.0. */
if (real_onep (arg))
return build_real (type, dconst0);
if (real_dconstp (arg, &value_truncate))
return build_real (type, dconst1);
}
-
+
/* Special case, optimize logN(expN(x)) = x. */
if (flag_unsafe_math_optimizations
&& ((value == &dconste
&& (fcode == BUILT_IN_EXP2
|| fcode == BUILT_IN_EXP2F
|| fcode == BUILT_IN_EXP2L))
- || (value == &dconst10
- && (fcode == BUILT_IN_EXP10
- || fcode == BUILT_IN_EXP10F
- || fcode == BUILT_IN_EXP10L))))
- return convert (type, TREE_VALUE (TREE_OPERAND (arg, 1)));
+ || (value == &dconst10 && (BUILTIN_EXP10_P (fcode)))))
+ return fold_convert (type, TREE_VALUE (TREE_OPERAND (arg, 1)));
- /* Optimize log*(func()) for various exponential functions. We
+ /* Optimize logN(func()) for various exponential functions. We
want to determine the value "x" and the power "exponent" in
order to transform logN(x**exponent) into exponent*logN(x). */
if (flag_unsafe_math_optimizations)
{
tree exponent = 0, x = 0;
-
+
switch (fcode)
{
case BUILT_IN_EXP:
return 0;
}
-
+
/* A subroutine of fold_builtin to fold the various exponent
functions. EXP is the CALL_EXPR of a call to a builtin function.
VALUE is the value which will be raised to a power. */
&& (fcode == BUILT_IN_LOG10
|| fcode == BUILT_IN_LOG10F
|| fcode == BUILT_IN_LOG10L)))
- return convert (type, TREE_VALUE (TREE_OPERAND (arg, 1)));
+ return fold_convert (type, TREE_VALUE (TREE_OPERAND (arg, 1)));
}
}
/* If SRC and DEST are the same (and not volatile), return DEST+LEN. */
if (operand_equal_p (src, dest, 0))
{
- tree temp = convert (TREE_TYPE (dest), len);
- temp = fold (build (PLUS_EXPR, TREE_TYPE (dest), dest, len));
- return convert (TREE_TYPE (exp), temp);
+ tree temp = fold_convert (TREE_TYPE (dest), len);
+ temp = fold (build (PLUS_EXPR, TREE_TYPE (dest), dest, temp));
+ return fold_convert (TREE_TYPE (exp), temp);
}
return 0;
/* If SRC and DEST are the same (and not volatile), return DEST. */
if (operand_equal_p (src, dest, 0))
- return convert (TREE_TYPE (exp), dest);
+ return fold_convert (TREE_TYPE (exp), dest);
return 0;
}
/* If ARG1 and ARG2 are the same (and not volatile), return zero. */
if (operand_equal_p (arg1, arg2, 0))
- return convert (TREE_TYPE (exp), integer_zero_node);
+ return fold_convert (TREE_TYPE (exp), integer_zero_node);
p1 = c_getstr (arg1);
p2 = c_getstr (arg2);
temp = integer_one_node;
else
temp = integer_zero_node;
- return convert (TREE_TYPE (exp), temp);
+ return fold_convert (TREE_TYPE (exp), temp);
}
return 0;
temp = integer_one_node;
else
temp = integer_zero_node;
- return convert (TREE_TYPE (exp), temp);
+ return fold_convert (TREE_TYPE (exp), temp);
}
return 0;
}
+/* Fold function call to builtin signbit, signbitf or signbitl. Return
+ NULL_TREE if no simplification can be made. */
+
+static tree
+fold_builtin_signbit (tree exp)
+{
+ tree arglist = TREE_OPERAND (exp, 1);
+ tree arg, temp;
+
+ if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return NULL_TREE;
+
+ arg = TREE_VALUE (arglist);
+
+ /* If ARG is a compile-time constant, determine the result. */
+ if (TREE_CODE (arg) == REAL_CST
+ && !TREE_CONSTANT_OVERFLOW (arg))
+ {
+ REAL_VALUE_TYPE c;
+
+ c = TREE_REAL_CST (arg);
+ temp = REAL_VALUE_NEGATIVE (c) ? integer_one_node : integer_zero_node;
+ return fold_convert (TREE_TYPE (exp), temp);
+ }
+
+ /* If ARG is non-negative, the result is always zero. */
+ if (tree_expr_nonnegative_p (arg))
+ return omit_one_operand (TREE_TYPE (exp), integer_zero_node, arg);
+
+ /* If ARG's format doesn't have signed zeros, return "arg < 0.0". */
+ if (!HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (arg))))
+ return fold (build (LT_EXPR, TREE_TYPE (exp), arg,
+ build_real (TREE_TYPE (arg), dconst0)));
+
+ return NULL_TREE;
+}
+
+/* Fold a call to builtin isascii. */
+
+static tree
+fold_builtin_isascii (tree arglist)
+{
+ if (! validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ /* Transform isascii(c) -> ((c & ~0x7f) == 0). */
+ tree arg = TREE_VALUE (arglist);
+
+ arg = fold (build (EQ_EXPR, integer_type_node,
+ build (BIT_AND_EXPR, integer_type_node, arg,
+ build_int_2 (~ (unsigned HOST_WIDE_INT) 0x7f,
+ ~ (HOST_WIDE_INT) 0)),
+ integer_zero_node));
+
+ if (in_gimple_form && !TREE_CONSTANT (arg))
+ return NULL_TREE;
+ else
+ return arg;
+ }
+}
+
+/* Fold a call to builtin toascii. */
+
+static tree
+fold_builtin_toascii (tree arglist)
+{
+ if (! validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ /* Transform toascii(c) -> (c & 0x7f). */
+ tree arg = TREE_VALUE (arglist);
+
+ return fold (build (BIT_AND_EXPR, integer_type_node, arg,
+ build_int_2 (0x7f, 0)));
+ }
+}
+
+/* Fold a call to builtin isdigit. */
+
+static tree
+fold_builtin_isdigit (tree arglist)
+{
+ if (! validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */
+ /* According to the C standard, isdigit is unaffected by locale. */
+ tree arg = TREE_VALUE (arglist);
+ arg = fold_convert (unsigned_type_node, arg);
+ arg = build (MINUS_EXPR, unsigned_type_node, arg,
+ fold_convert (unsigned_type_node,
+ build_int_2 (TARGET_DIGIT0, 0)));
+ arg = build (LE_EXPR, integer_type_node, arg,
+ fold_convert (unsigned_type_node, build_int_2 (9, 0)));
+ arg = fold (arg);
+ if (in_gimple_form && !TREE_CONSTANT (arg))
+ return NULL_TREE;
+ else
+ return arg;
+ }
+}
+
/* Used by constant folding to eliminate some builtin calls early. EXP is
the CALL_EXPR of a call to a builtin function. */
-tree
-fold_builtin (tree exp)
+static tree
+fold_builtin_1 (tree exp)
{
tree fndecl = get_callee_fndecl (exp);
tree arglist = TREE_OPERAND (exp, 1);
case BUILT_IN_CONSTANT_P:
return fold_builtin_constant_p (arglist);
+ case BUILT_IN_EXPECT:
+ return fold_builtin_expect (arglist);
+
case BUILT_IN_CLASSIFY_TYPE:
return fold_builtin_classify_type (arglist);
{
/* Convert from the internal "sizetype" type to "size_t". */
if (size_type_node)
- len = convert (size_type_node, len);
+ len = fold_convert (size_type_node, len);
return len;
}
}
case BUILT_IN_CABS:
case BUILT_IN_CABSF:
case BUILT_IN_CABSL:
- return fold_builtin_cabs (fndecl, arglist, type);
+ return fold_builtin_cabs (arglist, type);
case BUILT_IN_SQRT:
case BUILT_IN_SQRTF:
return build_real (type, r);
}
- /* Optimize sqrt(exp(x)) = exp(x*0.5). */
+ /* Optimize sqrt(expN(x)) = expN(x*0.5). */
fcode = builtin_mathfn_code (arg);
- if (flag_unsafe_math_optimizations
- && (fcode == BUILT_IN_EXP
- || fcode == BUILT_IN_EXPF
- || fcode == BUILT_IN_EXPL))
+ if (flag_unsafe_math_optimizations && BUILTIN_EXPONENT_P (fcode))
{
tree expfn = TREE_OPERAND (TREE_OPERAND (arg, 0), 0);
arg = fold (build (MULT_EXPR, type,
return build_function_call_expr (expfn, arglist);
}
+ /* Optimize sqrt(Nroot(x)) -> pow(x,1/(2*N)). */
+ if (flag_unsafe_math_optimizations && BUILTIN_ROOT_P (fcode))
+ {
+ tree powfn = mathfn_built_in (type, BUILT_IN_POW);
+
+ if (powfn)
+ {
+ tree arg0 = TREE_VALUE (TREE_OPERAND (arg, 1));
+ tree tree_root;
+ /* The inner root was either sqrt or cbrt. */
+ REAL_VALUE_TYPE dconstroot =
+ BUILTIN_SQRT_P (fcode) ? dconsthalf : dconstthird;
+
+ /* Adjust for the outer root. */
+ SET_REAL_EXP (&dconstroot, REAL_EXP (&dconstroot) - 1);
+ dconstroot = real_value_truncate (TYPE_MODE (type), dconstroot);
+ tree_root = build_real (type, dconstroot);
+ arglist = tree_cons (NULL_TREE, arg0,
+ build_tree_list (NULL_TREE, tree_root));
+ return build_function_call_expr (powfn, arglist);
+ }
+ }
+
/* Optimize sqrt(pow(x,y)) = pow(x,y*0.5). */
if (flag_unsafe_math_optimizations
&& (fcode == BUILT_IN_POW
}
break;
+ case BUILT_IN_CBRT:
+ case BUILT_IN_CBRTF:
+ case BUILT_IN_CBRTL:
+ if (validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ {
+ tree arg = TREE_VALUE (arglist);
+ const enum built_in_function fcode = builtin_mathfn_code (arg);
+
+ /* Optimize cbrt of constant value. */
+ if (real_zerop (arg) || real_onep (arg) || real_minus_onep (arg))
+ return arg;
+
+ /* Optimize cbrt(expN(x)) -> expN(x/3). */
+ if (flag_unsafe_math_optimizations && BUILTIN_EXPONENT_P (fcode))
+ {
+ tree expfn = TREE_OPERAND (TREE_OPERAND (arg, 0), 0);
+ const REAL_VALUE_TYPE third_trunc =
+ real_value_truncate (TYPE_MODE (type), dconstthird);
+ arg = fold (build (MULT_EXPR, type,
+ TREE_VALUE (TREE_OPERAND (arg, 1)),
+ build_real (type, third_trunc)));
+ arglist = build_tree_list (NULL_TREE, arg);
+ return build_function_call_expr (expfn, arglist);
+ }
+
+ /* Optimize cbrt(sqrt(x)) -> pow(x,1/6). */
+ /* We don't optimize cbrt(cbrt(x)) -> pow(x,1/9) because if
+ x is negative pow will error but cbrt won't. */
+ if (flag_unsafe_math_optimizations && BUILTIN_SQRT_P (fcode))
+ {
+ tree powfn = mathfn_built_in (type, BUILT_IN_POW);
+
+ if (powfn)
+ {
+ tree arg0 = TREE_VALUE (TREE_OPERAND (arg, 1));
+ tree tree_root;
+ REAL_VALUE_TYPE dconstroot = dconstthird;
+
+ SET_REAL_EXP (&dconstroot, REAL_EXP (&dconstroot) - 1);
+ dconstroot = real_value_truncate (TYPE_MODE (type), dconstroot);
+ tree_root = build_real (type, dconstroot);
+ arglist = tree_cons (NULL_TREE, arg0,
+ build_tree_list (NULL_TREE, tree_root));
+ return build_function_call_expr (powfn, arglist);
+ }
+
+ }
+ }
+ break;
+
case BUILT_IN_SIN:
case BUILT_IN_SINF:
case BUILT_IN_SINL:
REAL_VALUE_TYPE cst;
real_convert (&cst, TYPE_MODE (type), &dconstpi);
- cst.exp -= 2;
+ SET_REAL_EXP (&cst, REAL_EXP (&cst) - 2);
return build_real (type, cst);
}
}
if (flag_unsafe_math_optimizations
&& REAL_VALUES_EQUAL (c, dconsthalf))
{
- tree sqrtfn;
-
- fcode = DECL_FUNCTION_CODE (fndecl);
- if (fcode == BUILT_IN_POW)
- sqrtfn = implicit_built_in_decls[BUILT_IN_SQRT];
- else if (fcode == BUILT_IN_POWF)
- sqrtfn = implicit_built_in_decls[BUILT_IN_SQRTF];
- else if (fcode == BUILT_IN_POWL)
- sqrtfn = implicit_built_in_decls[BUILT_IN_SQRTL];
- else
- sqrtfn = NULL_TREE;
+ tree sqrtfn = mathfn_built_in (type, BUILT_IN_SQRT);
if (sqrtfn != NULL_TREE)
{
}
}
- /* Optimize pow(exp(x),y) = exp(x*y). */
+ /* Optimize pow(expN(x),y) = expN(x*y). */
fcode = builtin_mathfn_code (arg0);
- if (flag_unsafe_math_optimizations
- && (fcode == BUILT_IN_EXP
- || fcode == BUILT_IN_EXPF
- || fcode == BUILT_IN_EXPL))
+ if (flag_unsafe_math_optimizations && BUILTIN_EXPONENT_P (fcode))
{
tree expfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
tree arg = TREE_VALUE (TREE_OPERAND (arg0, 1));
}
/* Optimize pow(sqrt(x),y) = pow(x,y*0.5). */
- if (flag_unsafe_math_optimizations
- && (fcode == BUILT_IN_SQRT
- || fcode == BUILT_IN_SQRTF
- || fcode == BUILT_IN_SQRTL))
+ if (flag_unsafe_math_optimizations && BUILTIN_SQRT_P (fcode))
{
tree narg0 = TREE_VALUE (TREE_OPERAND (arg0, 1));
tree narg1 = fold (build (MULT_EXPR, type, arg1,
case BUILT_IN_ROUND:
case BUILT_IN_ROUNDF:
case BUILT_IN_ROUNDL:
+ return fold_builtin_round (exp);
+
case BUILT_IN_NEARBYINT:
case BUILT_IN_NEARBYINTF:
case BUILT_IN_NEARBYINTL:
+ case BUILT_IN_RINT:
+ case BUILT_IN_RINTF:
+ case BUILT_IN_RINTL:
return fold_trunc_transparent_mathfn (exp);
+ case BUILT_IN_LROUND:
+ case BUILT_IN_LROUNDF:
+ case BUILT_IN_LROUNDL:
+ case BUILT_IN_LLROUND:
+ case BUILT_IN_LLROUNDF:
+ case BUILT_IN_LLROUNDL:
+ return fold_builtin_lround (exp);
+
+ case BUILT_IN_LRINT:
+ case BUILT_IN_LRINTF:
+ case BUILT_IN_LRINTL:
+ case BUILT_IN_LLRINT:
+ case BUILT_IN_LLRINTF:
+ case BUILT_IN_LLRINTL:
+ return fold_fixed_mathfn (exp);
+
case BUILT_IN_FFS:
case BUILT_IN_FFSL:
case BUILT_IN_FFSLL:
case BUILT_IN_STRNCMP:
return fold_builtin_strncmp (exp);
+ case BUILT_IN_SIGNBIT:
+ case BUILT_IN_SIGNBITF:
+ case BUILT_IN_SIGNBITL:
+ return fold_builtin_signbit (exp);
+
+ case BUILT_IN_ISASCII:
+ return fold_builtin_isascii (arglist);
+
+ case BUILT_IN_TOASCII:
+ return fold_builtin_toascii (arglist);
+
+ case BUILT_IN_ISDIGIT:
+ return fold_builtin_isdigit (arglist);
+
default:
break;
}
return 0;
}
+/* A wrapper function for builtin folding that prevents warnings for
+ "statement without effect" and the like, caused by removing the
+ call node earlier than the warning is generated. */
+
+tree
+fold_builtin (tree exp)
+{
+ exp = fold_builtin_1 (exp);
+ if (exp)
+ {
+ /* ??? Don't clobber shared nodes such as integer_zero_node. */
+ if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
+ exp = build1 (NOP_EXPR, TREE_TYPE (exp), exp);
+ TREE_NO_WARNING (exp) = 1;
+ }
+ return exp;
+}
+
/* Conveniently construct a function call expression. */
tree
call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
- call_expr, arglist);
+ call_expr, arglist, NULL_TREE);
return fold (call_expr);
}
return NULL_RTX;
}
-/* Instantiate all remaining CONSTANT_P_RTX nodes. */
-
-void
-purge_builtin_constant_p (void)
-{
- rtx insn, set, arg, new, note;
-
- for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
- if (INSN_P (insn)
- && (set = single_set (insn)) != NULL_RTX
- && (GET_CODE (arg = SET_SRC (set)) == CONSTANT_P_RTX
- || (GET_CODE (arg) == SUBREG
- && (GET_CODE (arg = SUBREG_REG (arg))
- == CONSTANT_P_RTX))))
- {
- arg = XEXP (arg, 0);
- new = CONSTANT_P (arg) ? const1_rtx : const0_rtx;
- validate_change (insn, &SET_SRC (set), new, 0);
-
- /* Remove the REG_EQUAL note from the insn. */
- if ((note = find_reg_note (insn, REG_EQUAL, NULL_RTX)) != 0)
- remove_note (insn, note);
- }
-}
-
/* Returns true is EXP represents data that would potentially reside
in a readonly section. */
else
return false;
}
+
+/* Front-end to the simplify_builtin_XXX routines.
+
+ EXP is a call to a builtin function. If possible try to simplify
+ that into a constant, expression or call to a more efficient
+ builtin function.
+
+ If IGNORE is nonzero, then the result of this builtin function
+ call is ignored.
+
+ If simplification is possible, return the simplified tree, otherwise
+ return NULL_TREE. */
+
+tree
+simplify_builtin (tree exp, int ignore)
+{
+ tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
+ tree arglist = TREE_OPERAND (exp, 1);
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ tree val;
+
+ switch (fcode)
+ {
+ case BUILT_IN_FPUTS:
+ val = simplify_builtin_fputs (arglist, ignore, 0, NULL_TREE);
+ break;
+ case BUILT_IN_FPUTS_UNLOCKED:
+ val = simplify_builtin_fputs (arglist, ignore, 1, NULL_TREE);
+ break;
+ case BUILT_IN_STRSTR:
+ val = simplify_builtin_strstr (arglist);
+ break;
+ case BUILT_IN_STRCAT:
+ val = simplify_builtin_strcat (arglist);
+ break;
+ case BUILT_IN_STRNCAT:
+ val = simplify_builtin_strncat (arglist);
+ break;
+ case BUILT_IN_STRSPN:
+ val = simplify_builtin_strspn (arglist);
+ break;
+ case BUILT_IN_STRCSPN:
+ val = simplify_builtin_strcspn (arglist);
+ break;
+ case BUILT_IN_STRCHR:
+ case BUILT_IN_INDEX:
+ val = simplify_builtin_strchr (arglist);
+ break;
+ case BUILT_IN_STRRCHR:
+ case BUILT_IN_RINDEX:
+ val = simplify_builtin_strrchr (arglist);
+ break;
+ case BUILT_IN_STRCPY:
+ val = simplify_builtin_strcpy (arglist, NULL_TREE);
+ break;
+ case BUILT_IN_STRNCPY:
+ val = simplify_builtin_strncpy (arglist, NULL_TREE);
+ break;
+ case BUILT_IN_STRCMP:
+ val = simplify_builtin_strcmp (arglist);
+ break;
+ case BUILT_IN_STRNCMP:
+ val = simplify_builtin_strncmp (arglist);
+ break;
+ case BUILT_IN_STRPBRK:
+ val = simplify_builtin_strpbrk (arglist);
+ break;
+ case BUILT_IN_BCMP:
+ case BUILT_IN_MEMCMP:
+ val = simplify_builtin_memcmp (arglist);
+ break;
+ case BUILT_IN_VA_START:
+ simplify_builtin_va_start (arglist);
+ val = NULL_TREE;
+ break;
+ case BUILT_IN_SPRINTF:
+ val = simplify_builtin_sprintf (arglist, ignore);
+ break;
+ case BUILT_IN_CONSTANT_P:
+ val = fold_builtin_constant_p (arglist);
+ /* Gimplification will pull the CALL_EXPR for the builtin out of
+ an if condition. When not optimizing, we'll not CSE it back.
+ To avoid link error types of regressions, return false now. */
+ if (!val && !optimize)
+ val = integer_zero_node;
+ break;
+ default:
+ val = NULL_TREE;
+ break;
+ }
+
+ if (val)
+ val = fold_convert (TREE_TYPE (exp), val);
+ return val;
+}
+
+/* Simplify a call to the strstr builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strstr (tree arglist)
+{
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
+ tree fn;
+ const char *p1, *p2;
+
+ p2 = c_getstr (s2);
+ if (p2 == NULL)
+ return 0;
+
+ p1 = c_getstr (s1);
+ if (p1 != NULL)
+ {
+ const char *r = strstr (p1, p2);
+
+ if (r == NULL)
+ return fold_convert (TREE_TYPE (s1), integer_zero_node);
+
+ /* Return an offset into the constant string argument. */
+ return fold (build2 (PLUS_EXPR, TREE_TYPE (s1),
+ s1, fold_convert (TREE_TYPE (s1),
+ ssize_int (r - p1))));
+ }
+
+ if (p2[0] == '\0')
+ return s1;
+
+ if (p2[1] != '\0')
+ return 0;
+
+ fn = implicit_built_in_decls[BUILT_IN_STRCHR];
+ if (!fn)
+ return 0;
+
+ /* New argument list transforming strstr(s1, s2) to
+ strchr(s1, s2[0]). */
+ arglist = build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
+ arglist = tree_cons (NULL_TREE, s1, arglist);
+ return build_function_call_expr (fn, arglist);
+ }
+}
+
+/* Simplify a call to the strstr builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strchr (tree arglist)
+{
+ if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
+ const char *p1;
+
+ if (TREE_CODE (s2) != INTEGER_CST)
+ return 0;
+
+ p1 = c_getstr (s1);
+ if (p1 != NULL)
+ {
+ char c;
+ const char *r;
+
+ if (target_char_cast (s2, &c))
+ return 0;
+
+ r = strchr (p1, c);
+
+ if (r == NULL)
+ return fold_convert (TREE_TYPE (s1), integer_zero_node);
+
+ /* Return an offset into the constant string argument. */
+ return fold (build (PLUS_EXPR, TREE_TYPE (s1),
+ s1, fold_convert (TREE_TYPE (s1),
+ ssize_int (r - p1))));
+ }
+
+ /* FIXME: Should use here strchrM optab so that ports can optimize
+ this. */
+ return 0;
+ }
+}
+
+/* Simplify a call to the strrchr builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strrchr (tree arglist)
+{
+ if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
+ tree fn;
+ const char *p1;
+
+ if (TREE_CODE (s2) != INTEGER_CST)
+ return 0;
+
+ p1 = c_getstr (s1);
+ if (p1 != NULL)
+ {
+ char c;
+ const char *r;
+
+ if (target_char_cast (s2, &c))
+ return 0;
+
+ r = strrchr (p1, c);
+
+ if (r == NULL)
+ return fold_convert (TREE_TYPE (s1), integer_zero_node);
+
+ /* Return an offset into the constant string argument. */
+ return fold (build (PLUS_EXPR, TREE_TYPE (s1),
+ s1, fold_convert (TREE_TYPE (s1),
+ ssize_int (r - p1))));
+ }
+
+ if (! integer_zerop (s2))
+ return 0;
+
+ fn = implicit_built_in_decls[BUILT_IN_STRCHR];
+ if (!fn)
+ return 0;
+
+ /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
+ return build_function_call_expr (fn, arglist);
+ }
+}
+
+/* Simplify a call to the strpbrk builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strpbrk (tree arglist)
+{
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
+ tree fn;
+ const char *p1, *p2;
+
+ p2 = c_getstr (s2);
+ if (p2 == NULL)
+ return 0;
+
+ p1 = c_getstr (s1);
+ if (p1 != NULL)
+ {
+ const char *r = strpbrk (p1, p2);
+
+ if (r == NULL)
+ return fold_convert (TREE_TYPE (s1), integer_zero_node);
+
+ /* Return an offset into the constant string argument. */
+ return fold (build (PLUS_EXPR, TREE_TYPE (s1),
+ s1, fold_convert (TREE_TYPE (s1),
+ ssize_int (r - p1))));
+ }
+
+ if (p2[0] == '\0')
+ {
+ /* strpbrk(x, "") == NULL.
+ Evaluate and ignore the arguments in case they had
+ side-effects. */
+ return build (COMPOUND_EXPR, integer_type_node, s1,
+ integer_zero_node);
+ }
+
+ if (p2[1] != '\0')
+ return 0; /* Really call strpbrk. */
+
+ fn = implicit_built_in_decls[BUILT_IN_STRCHR];
+ if (!fn)
+ return 0;
+
+ /* New argument list transforming strpbrk(s1, s2) to
+ strchr(s1, s2[0]). */
+ arglist =
+ build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
+ arglist = tree_cons (NULL_TREE, s1, arglist);
+ return build_function_call_expr (fn, arglist);
+ }
+}
+
+/* Simplify a call to the strcpy builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+tree
+simplify_builtin_strcpy (tree arglist, tree len)
+{
+ tree fn, src, dst;
+
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return 0;
+
+ fn = implicit_built_in_decls[BUILT_IN_MEMCPY];
+ if (!fn)
+ return 0;
+
+ src = TREE_VALUE (TREE_CHAIN (arglist));
+ dst = TREE_VALUE (arglist);
+
+ if (!len)
+ {
+ len = c_strlen (src, 1);
+ if (!len || TREE_SIDE_EFFECTS (len))
+ return 0;
+ }
+
+ len = size_binop (PLUS_EXPR, len, ssize_int (1));
+ arglist = build_tree_list (NULL_TREE, len);
+ arglist = tree_cons (NULL_TREE, src, arglist);
+ arglist = tree_cons (NULL_TREE, dst, arglist);
+ return build_function_call_expr (fn, arglist);
+}
+
+/* Simplify a call to the strncpy builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+tree
+simplify_builtin_strncpy (tree arglist, tree slen)
+{
+ if (!validate_arglist (arglist,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
+ tree fn;
+
+ /* We must be passed a constant len parameter. */
+ if (TREE_CODE (len) != INTEGER_CST)
+ return 0;
+
+ /* If the len parameter is zero, return the dst parameter. */
+ if (integer_zerop (len))
+ {
+ /* Evaluate and ignore the src argument in case it has
+ side-effects and return the dst parameter. */
+ return build (COMPOUND_EXPR, TREE_TYPE (TREE_VALUE (arglist)),
+ TREE_VALUE (TREE_CHAIN (arglist)),
+ TREE_VALUE (arglist));
+ }
+
+ if (!slen)
+ slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)), 0);
+
+ /* Now, we must be passed a constant src ptr parameter. */
+ if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
+ return 0;
+
+ slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
+
+ /* We do not support simplification of this case, though we do
+ support it when expanding trees into RTL. */
+ /* FIXME: generate a call to __builtin_memset. */
+ if (tree_int_cst_lt (slen, len))
+ return 0;
+
+ /* OK transform into builtin memcpy. */
+ fn = implicit_built_in_decls[BUILT_IN_MEMCPY];
+ if (!fn)
+ return 0;
+ return build_function_call_expr (fn, arglist);
+ }
+}
+
+/* Simplify a call to the memcmp builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_memcmp (tree arglist)
+{
+ tree arg1, arg2, len;
+ const char *p1, *p2;
+
+ if (!validate_arglist (arglist,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+
+ arg1 = TREE_VALUE (arglist);
+ arg2 = TREE_VALUE (TREE_CHAIN (arglist));
+ len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
+
+ /* If the len parameter is zero, return zero. */
+ if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
+ {
+ /* Evaluate and ignore arg1 and arg2 in case they have
+ side-effects. */
+ return build (COMPOUND_EXPR, integer_type_node, arg1,
+ build (COMPOUND_EXPR, integer_type_node,
+ arg2, integer_zero_node));
+ }
+
+ p1 = c_getstr (arg1);
+ p2 = c_getstr (arg2);
+
+ /* If all arguments are constant, and the value of len is not greater
+ than the lengths of arg1 and arg2, evaluate at compile-time. */
+ if (host_integerp (len, 1) && p1 && p2
+ && compare_tree_int (len, strlen (p1) + 1) <= 0
+ && compare_tree_int (len, strlen (p2) + 1) <= 0)
+ {
+ const int r = memcmp (p1, p2, tree_low_cst (len, 1));
+
+ return (r < 0
+ ? integer_minus_one_node
+ : (r > 0 ? integer_one_node : integer_zero_node));
+ }
+
+ /* If len parameter is one, return an expression corresponding to
+ (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
+ if (host_integerp (len, 1) && tree_low_cst (len, 1) == 1)
+ {
+ tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
+ tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
+ tree ind1 =
+ fold (build1 (CONVERT_EXPR, integer_type_node,
+ build1 (INDIRECT_REF, cst_uchar_node,
+ build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
+ tree ind2 =
+ fold (build1 (CONVERT_EXPR, integer_type_node,
+ build1 (INDIRECT_REF, cst_uchar_node,
+ build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
+ return fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
+ }
+
+ return 0;
+}
+
+/* Simplify a call to the strcmp builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strcmp (tree arglist)
+{
+ tree arg1, arg2;
+ const char *p1, *p2;
+
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return 0;
+
+ arg1 = TREE_VALUE (arglist);
+ arg2 = TREE_VALUE (TREE_CHAIN (arglist));
+
+ /* If both arguments are equal (and not volatile), return zero. */
+ if (operand_equal_p (arg1, arg2, 0))
+ return integer_zero_node;
+
+ p1 = c_getstr (arg1);
+ p2 = c_getstr (arg2);
+
+ if (p1 && p2)
+ {
+ const int i = strcmp (p1, p2);
+ return (i < 0
+ ? integer_minus_one_node
+ : (i > 0 ? integer_one_node : integer_zero_node));
+ }
+
+ /* If either arg is "", return an expression corresponding to
+ (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
+ if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
+ {
+ tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
+ tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
+ tree ind1 =
+ fold (build1 (CONVERT_EXPR, integer_type_node,
+ build1 (INDIRECT_REF, cst_uchar_node,
+ build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
+ tree ind2 =
+ fold (build1 (CONVERT_EXPR, integer_type_node,
+ build1 (INDIRECT_REF, cst_uchar_node,
+ build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
+ return fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
+ }
+
+ return 0;
+}
+
+/* Simplify a call to the strncmp builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strncmp (tree arglist)
+{
+ tree arg1, arg2, arg3;
+ const char *p1, *p2;
+
+ if (!validate_arglist (arglist,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+
+ arg1 = TREE_VALUE (arglist);
+ arg2 = TREE_VALUE (TREE_CHAIN (arglist));
+ arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
+
+ /* If the len parameter is zero, return zero. */
+ if (integer_zerop (arg3))
+ {
+ /* Evaluate and ignore arg1 and arg2 in case they have
+ side-effects. */
+ return build (COMPOUND_EXPR, integer_type_node, arg1,
+ build (COMPOUND_EXPR, integer_type_node,
+ arg2, integer_zero_node));
+ }
+
+ /* If arg1 and arg2 are equal (and not volatile), return zero. */
+ if (operand_equal_p (arg1, arg2, 0))
+ {
+ /* Evaluate and ignore arg3 in case it has side-effects. */
+ return build (COMPOUND_EXPR, integer_type_node, arg3, integer_zero_node);
+ }
+
+ p1 = c_getstr (arg1);
+ p2 = c_getstr (arg2);
+
+ /* If all arguments are constant, evaluate at compile-time. */
+ if (host_integerp (arg3, 1) && p1 && p2)
+ {
+ const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
+ return (r < 0
+ ? integer_minus_one_node
+ : (r > 0 ? integer_one_node : integer_zero_node));
+ }
+
+ /* If len == 1 or (either string parameter is "" and (len >= 1)),
+ return (*(const u_char*)arg1 - *(const u_char*)arg2). */
+ if (host_integerp (arg3, 1)
+ && (tree_low_cst (arg3, 1) == 1
+ || (tree_low_cst (arg3, 1) > 1
+ && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
+ {
+ tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
+ tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
+ tree ind1 =
+ fold (build1 (CONVERT_EXPR, integer_type_node,
+ build1 (INDIRECT_REF, cst_uchar_node,
+ build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
+ tree ind2 =
+ fold (build1 (CONVERT_EXPR, integer_type_node,
+ build1 (INDIRECT_REF, cst_uchar_node,
+ build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
+ return fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
+ }
+
+ return 0;
+}
+
+/* Simplify a call to the strcat builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strcat (tree arglist)
+{
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree dst = TREE_VALUE (arglist),
+ src = TREE_VALUE (TREE_CHAIN (arglist));
+ const char *p = c_getstr (src);
+
+ /* If the string length is zero, return the dst parameter. */
+ if (p && *p == '\0')
+ return dst;
+
+ return 0;
+ }
+}
+
+/* Simplify a call to the strncat builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strncat (tree arglist)
+{
+ if (!validate_arglist (arglist,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree dst = TREE_VALUE (arglist);
+ tree src = TREE_VALUE (TREE_CHAIN (arglist));
+ tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
+ const char *p = c_getstr (src);
+
+ /* If the requested length is zero, or the src parameter string
+ length is zero, return the dst parameter. */
+ if (integer_zerop (len) || (p && *p == '\0'))
+ return build (COMPOUND_EXPR, TREE_TYPE (dst), src,
+ build (COMPOUND_EXPR, integer_type_node, len, dst));
+
+ /* If the requested len is greater than or equal to the string
+ length, call strcat. */
+ if (TREE_CODE (len) == INTEGER_CST && p
+ && compare_tree_int (len, strlen (p)) >= 0)
+ {
+ tree newarglist
+ = tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src));
+ tree fn = implicit_built_in_decls[BUILT_IN_STRCAT];
+
+ /* If the replacement _DECL isn't initialized, don't do the
+ transformation. */
+ if (!fn)
+ return 0;
+
+ return build_function_call_expr (fn, newarglist);
+ }
+ return 0;
+ }
+}
+
+/* Simplify a call to the strspn builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strspn (tree arglist)
+{
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
+ const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
+
+ /* If both arguments are constants, evaluate at compile-time. */
+ if (p1 && p2)
+ {
+ const size_t r = strspn (p1, p2);
+ return size_int (r);
+ }
+
+ /* If either argument is "", return 0. */
+ if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
+ {
+ /* Evaluate and ignore both arguments in case either one has
+ side-effects. */
+ return build (COMPOUND_EXPR, integer_type_node, s1,
+ build (COMPOUND_EXPR, integer_type_node,
+ s2, integer_zero_node));
+ }
+ return 0;
+ }
+}
+
+/* Simplify a call to the strcspn builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+simplify_builtin_strcspn (tree arglist)
+{
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return 0;
+ else
+ {
+ tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
+ const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
+
+ /* If both arguments are constants, evaluate at compile-time. */
+ if (p1 && p2)
+ {
+ const size_t r = strcspn (p1, p2);
+ return size_int (r);
+ }
+
+ /* If the first argument is "", return 0. */
+ if (p1 && *p1 == '\0')
+ {
+ /* Evaluate and ignore argument s2 in case it has
+ side-effects. */
+ return build (COMPOUND_EXPR, integer_type_node,
+ s2, integer_zero_node);
+ }
+
+ /* If the second argument is "", return __builtin_strlen(s1). */
+ if (p2 && *p2 == '\0')
+ {
+ tree newarglist = build_tree_list (NULL_TREE, s1),
+ fn = implicit_built_in_decls[BUILT_IN_STRLEN];
+
+ /* If the replacement _DECL isn't initialized, don't do the
+ transformation. */
+ if (!fn)
+ return 0;
+
+ return build_function_call_expr (fn, newarglist);
+ }
+ return 0;
+ }
+}
+
+/* Simplify a call to the fputs builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
+
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
+
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call.
+
+ If KNOWN_LEN is non-NULL, it represents the known length of the string.
+ This is determined by SSA-CCP in cases where the string itself is not
+ known to be constant but its length is always the same constant. */
+
+tree
+simplify_builtin_fputs (tree arglist, int ignore, int unlocked, tree known_len)
+{
+ tree len, fn;
+ tree fn_fputc = unlocked ? implicit_built_in_decls[BUILT_IN_FPUTC_UNLOCKED]
+ : implicit_built_in_decls[BUILT_IN_FPUTC];
+ tree fn_fwrite = unlocked ? implicit_built_in_decls[BUILT_IN_FWRITE_UNLOCKED]
+ : implicit_built_in_decls[BUILT_IN_FWRITE];
+
+ /* If the return value is used, or the replacement _DECL isn't
+ initialized, don't do the transformation. */
+ if (!ignore || !fn_fputc || !fn_fwrite)
+ return 0;
+
+ /* Verify the arguments in the original call. */
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return 0;
+
+ len = (known_len) ? known_len : c_strlen (TREE_VALUE (arglist), 0);
+
+ /* Get the length of the string passed to fputs. If the length
+ can't be determined, punt. */
+ if (!len
+ || TREE_CODE (len) != INTEGER_CST)
+ return 0;
+
+ switch (compare_tree_int (len, 1))
+ {
+ case -1: /* length is 0, delete the call entirely . */
+ {
+ return build (COMPOUND_EXPR, integer_type_node,
+ TREE_VALUE (TREE_CHAIN (arglist)), integer_zero_node);
+ }
+ case 0: /* length is 1, call fputc. */
+ {
+ const char *p = c_getstr (TREE_VALUE (arglist));
+
+ if (p != NULL)
+ {
+ /* New argument list transforming fputs(string, stream) to
+ fputc(string[0], stream). */
+ arglist =
+ build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
+ arglist =
+ tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
+ fn = fn_fputc;
+ break;
+ }
+ }
+ /* FALLTHROUGH */
+ case 1: /* length is greater than 1, call fwrite. */
+ {
+ tree string_arg;
+
+ /* If optimizing for size keep fputs. */
+ if (optimize_size)
+ return 0;
+ string_arg = TREE_VALUE (arglist);
+ /* New argument list transforming fputs(string, stream) to
+ fwrite(string, 1, len, stream). */
+ arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
+ arglist = tree_cons (NULL_TREE, len, arglist);
+ arglist = tree_cons (NULL_TREE, size_one_node, arglist);
+ arglist = tree_cons (NULL_TREE, string_arg, arglist);
+ fn = fn_fwrite;
+ break;
+ }
+ default:
+ abort ();
+ }
+
+ return build_function_call_expr (fn, arglist);
+}
+
+static void
+simplify_builtin_va_start (tree arglist)
+{
+ tree chain = TREE_CHAIN (arglist);
+
+ if (TREE_CHAIN (chain))
+ error ("too many arguments to function `va_start'");
+
+ simplify_builtin_next_arg (chain);
+}
+
+static void
+simplify_builtin_next_arg (tree arglist)
+{
+ tree fntype = TREE_TYPE (current_function_decl);
+
+ if (TYPE_ARG_TYPES (fntype) == 0
+ || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
+ == void_type_node))
+ error ("`va_start' used in function with fixed args");
+ else if (arglist)
+ {
+ tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
+ tree arg = TREE_VALUE (arglist);
+
+ /* Strip off all nops for the sake of the comparison. This
+ is not quite the same as STRIP_NOPS. It does more.
+ We must also strip off INDIRECT_EXPR for C++ reference
+ parameters. */
+ while (TREE_CODE (arg) == NOP_EXPR
+ || TREE_CODE (arg) == CONVERT_EXPR
+ || TREE_CODE (arg) == NON_LVALUE_EXPR
+ || TREE_CODE (arg) == INDIRECT_REF)
+ arg = TREE_OPERAND (arg, 0);
+ if (arg != last_parm)
+ warning ("second parameter of `va_start' not last named argument");
+ TREE_VALUE (arglist) = arg;
+ }
+ else
+ /* Evidently an out of date version of <stdarg.h>; can't validate
+ va_start's second argument, but can still work as intended. */
+ warning ("`__builtin_next_arg' called without an argument");
+}
+
+
+/* Simplify a call to the sprintf builtin.
+
+ Return 0 if no simplification was possible, otherwise return the
+ simplified form of the call as a tree. If IGNORED is true, it means that
+ the caller does not use the returned value of the function. */
+
+static tree
+simplify_builtin_sprintf (tree arglist, int ignored)
+{
+ tree call, retval, dest, fmt;
+ const char *fmt_str = NULL;
+
+ /* Verify the required arguments in the original call. We deal with two
+ types of sprintf() calls: 'sprintf (str, fmt)' and
+ 'sprintf (dest, "%s", orig)'. */
+ if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
+ && !validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, POINTER_TYPE,
+ VOID_TYPE))
+ return NULL_TREE;
+
+ /* Get the destination string and the format specifier. */
+ dest = TREE_VALUE (arglist);
+ fmt = TREE_VALUE (TREE_CHAIN (arglist));
+
+ /* Check whether the format is a literal string constant. */
+ fmt_str = c_getstr (fmt);
+ if (fmt_str == NULL)
+ return NULL_TREE;
+
+ call = NULL_TREE;
+ retval = NULL_TREE;
+
+ /* If the format doesn't contain % args or %%, use strcpy. */
+ if (strchr (fmt_str, '%') == NULL)
+ {
+ tree fn = implicit_built_in_decls[BUILT_IN_STRCPY];
+
+ if (!fn)
+ return NULL_TREE;
+
+ /* Convert sprintf (str, fmt) into strcpy (str, fmt) when
+ 'format' is known to contain no % formats. */
+ arglist = build_tree_list (NULL_TREE, fmt);
+ arglist = tree_cons (NULL_TREE, dest, arglist);
+ call = build_function_call_expr (fn, arglist);
+ if (!ignored)
+ retval = build_int_2 (strlen (fmt_str), 0);
+ }
+
+ /* If the format is "%s", use strcpy if the result isn't used. */
+ else if (fmt_str && strcmp (fmt_str, "%s") == 0)
+ {
+ tree fn, orig;
+ fn = implicit_built_in_decls[BUILT_IN_STRCPY];
+
+ if (!fn)
+ return NULL_TREE;
+
+ /* Convert sprintf (str1, "%s", str2) into strcpy (str1, str2). */
+ orig = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
+ arglist = build_tree_list (NULL_TREE, orig);
+ arglist = tree_cons (NULL_TREE, dest, arglist);
+ if (!ignored)
+ {
+ retval = c_strlen (orig, 1);
+ if (!retval || TREE_CODE (retval) != INTEGER_CST)
+ return NULL_TREE;
+ }
+ call = build_function_call_expr (fn, arglist);
+ }
+
+ if (call && retval)
+ {
+ retval = convert
+ (TREE_TYPE (TREE_TYPE (implicit_built_in_decls[BUILT_IN_SPRINTF])),
+ retval);
+ return build (COMPOUND_EXPR, TREE_TYPE (retval), call, retval);
+ }
+ else
+ return call;
+}
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