/* Convert function calls to rtl insns, for GNU C compiler.
Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005
+ Free Software Foundation, Inc.
This file is part of GCC.
This is not the same register as for normal calls on machines with
register windows. */
rtx tail_call_reg;
+ /* If REG is a PARALLEL, this is a copy of VALUE pulled into the correct
+ form for emit_group_move. */
+ rtx parallel_value;
/* If REG was promoted from the actual mode of the argument expression,
indicates whether the promotion is sign- or zero-extended. */
int unsignedp;
- /* Number of registers to use. 0 means put the whole arg in registers.
- Also 0 if not passed in registers. */
+ /* Number of bytes to put in registers. 0 means put the whole arg
+ in registers. Also 0 if not passed in registers. */
int partial;
/* Nonzero if argument must be passed on stack.
Note that some arguments may be passed on the stack
returns a BLKmode struct) and expand_call must take special action
to make sure the object being constructed does not overlap the
argument list for the constructor call. */
-int stack_arg_under_construction;
-
-static int calls_function (tree, int);
-static int calls_function_1 (tree, int);
+static int stack_arg_under_construction;
static void emit_call_1 (rtx, tree, tree, tree, HOST_WIDE_INT, HOST_WIDE_INT,
HOST_WIDE_INT, rtx, rtx, int, rtx, int,
static int check_sibcall_argument_overlap (rtx, struct arg_data *, int);
static int combine_pending_stack_adjustment_and_call (int, struct args_size *,
- int);
-static tree fix_unsafe_tree (tree);
-static bool shift_returned_value (tree, rtx *);
+ unsigned int);
+static tree split_complex_values (tree);
+static tree split_complex_types (tree);
#ifdef REG_PARM_STACK_SPACE
static rtx save_fixed_argument_area (int, rtx, int *, int *);
static void restore_fixed_argument_area (rtx, rtx, int, int);
#endif
\f
-/* If WHICH is 1, return 1 if EXP contains a call to the built-in function
- `alloca'.
-
- If WHICH is 0, return 1 if EXP contains a call to any function.
- Actually, we only need return 1 if evaluating EXP would require pushing
- arguments on the stack, but that is too difficult to compute, so we just
- assume any function call might require the stack. */
-
-static tree calls_function_save_exprs;
-
-static int
-calls_function (tree exp, int which)
-{
- int val;
-
- calls_function_save_exprs = 0;
- val = calls_function_1 (exp, which);
- calls_function_save_exprs = 0;
- return val;
-}
-
-/* Recursive function to do the work of above function. */
-
-static int
-calls_function_1 (tree exp, int which)
-{
- int i;
- enum tree_code code = TREE_CODE (exp);
- int class = TREE_CODE_CLASS (code);
- int length = first_rtl_op (code);
-
- /* If this code is language-specific, we don't know what it will do. */
- if ((int) code >= NUM_TREE_CODES)
- return 1;
-
- switch (code)
- {
- case CALL_EXPR:
- if (which == 0)
- return 1;
- else if ((TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
- == FUNCTION_TYPE)
- && (TYPE_RETURNS_STACK_DEPRESSED
- (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))))
- return 1;
- else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
- && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
- == FUNCTION_DECL)
- && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
- 0)
- & ECF_MAY_BE_ALLOCA))
- return 1;
-
- break;
-
- case CONSTRUCTOR:
- {
- tree tem;
-
- for (tem = CONSTRUCTOR_ELTS (exp); tem != 0; tem = TREE_CHAIN (tem))
- if (calls_function_1 (TREE_VALUE (tem), which))
- return 1;
- }
-
- return 0;
-
- case SAVE_EXPR:
- if (SAVE_EXPR_RTL (exp) != 0)
- return 0;
- if (value_member (exp, calls_function_save_exprs))
- return 0;
- calls_function_save_exprs = tree_cons (NULL_TREE, exp,
- calls_function_save_exprs);
- return (TREE_OPERAND (exp, 0) != 0
- && calls_function_1 (TREE_OPERAND (exp, 0), which));
-
- case BLOCK:
- {
- tree local;
- tree subblock;
-
- for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local))
- if (DECL_INITIAL (local) != 0
- && calls_function_1 (DECL_INITIAL (local), which))
- return 1;
-
- for (subblock = BLOCK_SUBBLOCKS (exp);
- subblock;
- subblock = TREE_CHAIN (subblock))
- if (calls_function_1 (subblock, which))
- return 1;
- }
- return 0;
-
- case TREE_LIST:
- for (; exp != 0; exp = TREE_CHAIN (exp))
- if (calls_function_1 (TREE_VALUE (exp), which))
- return 1;
- return 0;
-
- default:
- break;
- }
-
- /* Only expressions and blocks can contain calls.
- Blocks were handled above. */
- if (! IS_EXPR_CODE_CLASS (class))
- return 0;
-
- for (i = 0; i < length; i++)
- if (TREE_OPERAND (exp, i) != 0
- && calls_function_1 (TREE_OPERAND (exp, i), which))
- return 1;
-
- return 0;
-}
-\f
/* Force FUNEXP into a form suitable for the address of a CALL,
and return that as an rtx. Also load the static chain register
if FNDECL is a nested function.
prepare_call_address (rtx funexp, rtx static_chain_value,
rtx *call_fusage, int reg_parm_seen, int sibcallp)
{
- funexp = protect_from_queue (funexp, 0);
-
/* Make a valid memory address and copy constants through pseudo-regs,
but not for a constant address if -fno-function-cse. */
if (GET_CODE (funexp) != SYMBOL_REF)
if (static_chain_value != 0)
{
+ static_chain_value = convert_memory_address (Pmode, static_chain_value);
emit_move_insn (static_chain_rtx, static_chain_value);
if (REG_P (static_chain_rtx))
}
else
#endif
- abort ();
+ gcc_unreachable ();
/* Find the call we just emitted. */
call_insn = last_call_insn ();
if (ecf_flags & ECF_NORETURN)
REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_NORETURN, const0_rtx,
REG_NOTES (call_insn));
- if (ecf_flags & ECF_ALWAYS_RETURN)
- REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_ALWAYS_RETURN, const0_rtx,
- REG_NOTES (call_insn));
if (ecf_flags & ECF_RETURNS_TWICE)
{
if (rounded_stack_size != 0)
{
- if (ecf_flags & (ECF_SP_DEPRESSED | ECF_NORETURN | ECF_LONGJMP))
+ if (ecf_flags & (ECF_SP_DEPRESSED | ECF_NORETURN))
/* Just pretend we did the pop. */
stack_pointer_delta -= rounded_stack_size;
else if (flag_defer_pop && inhibit_defer_pop == 0
For example, if the function might return more than one time (setjmp), then
set RETURNS_TWICE to a nonzero value.
- Similarly set LONGJMP for if the function is in the longjmp family.
+ Similarly set NORETURN if the function is in the longjmp family.
Set MAY_BE_ALLOCA for any memory allocation function that might allocate
space from the stack such as alloca. */
hacky imitation of DECL_ASSEMBLER_NAME. It's (also) wrong
because you can declare fork() inside a function if you
wish. */
- && (DECL_CONTEXT (fndecl) == NULL_TREE
+ && (DECL_CONTEXT (fndecl) == NULL_TREE
|| TREE_CODE (DECL_CONTEXT (fndecl)) == TRANSLATION_UNIT_DECL)
&& TREE_PUBLIC (fndecl))
{
if (tname[1] == 'i'
&& ! strcmp (tname, "siglongjmp"))
- flags |= ECF_LONGJMP;
+ flags |= ECF_NORETURN;
}
else if ((tname[0] == 'q' && tname[1] == 's'
&& ! strcmp (tname, "qsetjmp"))
else if (tname[0] == 'l' && tname[1] == 'o'
&& ! strcmp (tname, "longjmp"))
- flags |= ECF_LONGJMP;
+ flags |= ECF_NORETURN;
}
return flags;
}
-/* Return nonzero when tree represent call to longjmp. */
+/* Return nonzero when FNDECL represents a call to setjmp. */
int
setjmp_call_p (tree fndecl)
if (DECL_IS_MALLOC (exp))
flags |= ECF_MALLOC;
+ /* The function exp may have the `returns_twice' attribute. */
+ if (DECL_IS_RETURNS_TWICE (exp))
+ flags |= ECF_RETURNS_TWICE;
+
/* The function exp may have the `pure' attribute. */
if (DECL_IS_PURE (exp))
flags |= ECF_PURE | ECF_LIBCALL_BLOCK;
+ if (DECL_IS_NOVOPS (exp))
+ flags |= ECF_NOVOPS;
+
if (TREE_NOTHROW (exp))
flags |= ECF_NOTHROW;
Set REG_PARM_SEEN if we encounter a register parameter. */
static void
-precompute_register_parameters (int num_actuals, struct arg_data *args, int *reg_parm_seen)
+precompute_register_parameters (int num_actuals, struct arg_data *args,
+ int *reg_parm_seen)
{
int i;
VOIDmode, 0);
preserve_temp_slots (args[i].value);
pop_temp_slots ();
-
- /* ANSI doesn't require a sequence point here,
- but PCC has one, so this will avoid some problems. */
- emit_queue ();
}
/* If the value is a non-legitimate constant, force it into a
TYPE_MODE (TREE_TYPE (args[i].tree_value)),
args[i].value, args[i].unsignedp);
+ /* If we're going to have to load the value by parts, pull the
+ parts into pseudos. The part extraction process can involve
+ non-trivial computation. */
+ if (GET_CODE (args[i].reg) == PARALLEL)
+ {
+ tree type = TREE_TYPE (args[i].tree_value);
+ args[i].parallel_value
+ = emit_group_load_into_temps (args[i].reg, args[i].value,
+ type, int_size_in_bytes (type));
+ }
+
/* If the value is expensive, and we are inside an appropriately
short loop, put the value into a pseudo and then put the pseudo
into the hard reg.
register parameters. This is to avoid reload conflicts while
loading the parameters registers. */
- if ((! (REG_P (args[i].value)
- || (GET_CODE (args[i].value) == SUBREG
- && REG_P (SUBREG_REG (args[i].value)))))
- && args[i].mode != BLKmode
- && rtx_cost (args[i].value, SET) > COSTS_N_INSNS (1)
- && ((SMALL_REGISTER_CLASSES && *reg_parm_seen)
- || preserve_subexpressions_p ()))
+ else if ((! (REG_P (args[i].value)
+ || (GET_CODE (args[i].value) == SUBREG
+ && REG_P (SUBREG_REG (args[i].value)))))
+ && args[i].mode != BLKmode
+ && rtx_cost (args[i].value, SET) > COSTS_N_INSNS (1)
+ && ((SMALL_REGISTER_CLASSES && *reg_parm_seen)
+ || optimize))
args[i].value = copy_to_mode_reg (args[i].mode, args[i].value);
}
}
< (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD)))
{
int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value));
- int nregs = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
int endian_correction = 0;
- args[i].n_aligned_regs = args[i].partial ? args[i].partial : nregs;
+ if (args[i].partial)
+ {
+ gcc_assert (args[i].partial % UNITS_PER_WORD == 0);
+ args[i].n_aligned_regs = args[i].partial / UNITS_PER_WORD;
+ }
+ else
+ {
+ args[i].n_aligned_regs
+ = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
+ }
+
args[i].aligned_regs = xmalloc (sizeof (rtx) * args[i].n_aligned_regs);
/* Structures smaller than a word are normally aligned to the
args[i].aligned_regs[j] = reg;
word = extract_bit_field (word, bitsize, 0, 1, NULL_RTX,
- word_mode, word_mode, BITS_PER_WORD);
+ word_mode, word_mode);
/* There is no need to restrict this code to loading items
in TYPE_ALIGN sized hunks. The bitfield instructions can
bytes -= bitsize / BITS_PER_UNIT;
store_bit_field (reg, bitsize, endian_correction, word_mode,
- word, BITS_PER_WORD);
+ word);
}
}
}
and may be modified by this routine.
OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer
- flags which may may be modified by this routine.
+ flags which may may be modified by this routine.
MAY_TAILCALL is cleared if we encounter an invisible pass-by-reference
that requires allocation of stack space.
args[i].reg is nonzero if all or part is passed in registers.
args[i].partial is nonzero if part but not all is passed in registers,
- and the exact value says how many words are passed in registers.
+ and the exact value says how many bytes are passed in registers.
args[i].pass_on_stack is nonzero if the argument must at least be
computed on the stack. It may then be loaded back into registers
with those made by function.c. */
/* See if this argument should be passed by invisible reference. */
- if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type))
- || TREE_ADDRESSABLE (type)
-#ifdef FUNCTION_ARG_PASS_BY_REFERENCE
- || FUNCTION_ARG_PASS_BY_REFERENCE (*args_so_far, TYPE_MODE (type),
- type, argpos < n_named_args)
-#endif
- )
+ if (pass_by_reference (args_so_far, TYPE_MODE (type),
+ type, argpos < n_named_args))
{
- /* If we're compiling a thunk, pass through invisible
- references instead of making a copy. */
+ bool callee_copies;
+ tree base;
+
+ callee_copies
+ = reference_callee_copied (args_so_far, TYPE_MODE (type),
+ type, argpos < n_named_args);
+
+ /* If we're compiling a thunk, pass through invisible references
+ instead of making a copy. */
if (call_from_thunk_p
-#ifdef FUNCTION_ARG_CALLEE_COPIES
- || (FUNCTION_ARG_CALLEE_COPIES (*args_so_far, TYPE_MODE (type),
- type, argpos < n_named_args)
- /* If it's in a register, we must make a copy of it too. */
- /* ??? Is this a sufficient test? Is there a better one? */
- && !(TREE_CODE (args[i].tree_value) == VAR_DECL
- && REG_P (DECL_RTL (args[i].tree_value)))
- && ! TREE_ADDRESSABLE (type))
-#endif
- )
+ || (callee_copies
+ && !TREE_ADDRESSABLE (type)
+ && (base = get_base_address (args[i].tree_value))
+ && (!DECL_P (base) || MEM_P (DECL_RTL (base)))))
{
- /* C++ uses a TARGET_EXPR to indicate that we want to make a
- new object from the argument. If we are passing by
- invisible reference, the callee will do that for us, so we
- can strip off the TARGET_EXPR. This is not always safe,
- but it is safe in the only case where this is a useful
- optimization; namely, when the argument is a plain object.
- In that case, the frontend is just asking the backend to
- make a bitwise copy of the argument. */
-
- if (TREE_CODE (args[i].tree_value) == TARGET_EXPR
- && (DECL_P (TREE_OPERAND (args[i].tree_value, 1)))
- && ! REG_P (DECL_RTL (TREE_OPERAND (args[i].tree_value, 1))))
- args[i].tree_value = TREE_OPERAND (args[i].tree_value, 1);
-
- /* We can't use sibcalls if a callee-copied argument is stored
- in the current function's frame. */
- if (!call_from_thunk_p
- && (!DECL_P (args[i].tree_value)
- || !TREE_STATIC (args[i].tree_value)))
+ /* We can't use sibcalls if a callee-copied argument is
+ stored in the current function's frame. */
+ if (!call_from_thunk_p && DECL_P (base) && !TREE_STATIC (base))
*may_tailcall = false;
- args[i].tree_value = build1 (ADDR_EXPR,
- build_pointer_type (type),
- args[i].tree_value);
- type = build_pointer_type (type);
- }
- else if (TREE_CODE (args[i].tree_value) == TARGET_EXPR)
- {
- /* In the V3 C++ ABI, parameters are destroyed in the caller.
- We implement this by passing the address of the temporary
- rather than expanding it into another allocated slot. */
- args[i].tree_value = build1 (ADDR_EXPR,
- build_pointer_type (type),
- args[i].tree_value);
- type = build_pointer_type (type);
- *may_tailcall = false;
+ args[i].tree_value = build_fold_addr_expr (args[i].tree_value);
+ type = TREE_TYPE (args[i].tree_value);
+
+ *ecf_flags &= ~(ECF_CONST | ECF_LIBCALL_BLOCK);
}
else
{
copy = assign_temp (type, 0, 1, 0);
store_expr (args[i].tree_value, copy, 0);
- *ecf_flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK);
- args[i].tree_value = build1 (ADDR_EXPR,
- build_pointer_type (type),
- make_tree (type, copy));
- type = build_pointer_type (type);
+ if (callee_copies)
+ *ecf_flags &= ~(ECF_CONST | ECF_LIBCALL_BLOCK);
+ else
+ *ecf_flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK);
+
+ args[i].tree_value
+ = build_fold_addr_expr (make_tree (type, copy));
+ type = TREE_TYPE (args[i].tree_value);
*may_tailcall = false;
}
}
args[i].tail_call_reg = args[i].reg;
#endif
-#ifdef FUNCTION_ARG_PARTIAL_NREGS
if (args[i].reg)
args[i].partial
- = FUNCTION_ARG_PARTIAL_NREGS (*args_so_far, mode, type,
- argpos < n_named_args);
-#endif
+ = targetm.calls.arg_partial_bytes (args_so_far, mode, type,
+ argpos < n_named_args);
- args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type);
+ args[i].pass_on_stack = targetm.calls.must_pass_in_stack (mode, type);
/* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]),
it means that we are to pass this arg in the register(s) designated
/* We don't handle this case yet. To handle it correctly we have
to add the delta, round and subtract the delta.
Currently no machine description requires this support. */
- if (stack_pointer_delta & (preferred_stack_boundary - 1))
- abort ();
+ gcc_assert (!(stack_pointer_delta & (preferred_stack_boundary - 1)));
args_size->var = round_up (args_size->var, preferred_stack_boundary);
}
int i;
/* If this is a libcall, then precompute all arguments so that we do not
- get extraneous instructions emitted as part of the libcall sequence.
-
- If this target defines ACCUMULATE_OUTGOING_ARGS to true, then we must
- precompute all arguments that contain function calls. Otherwise,
- computing arguments for a subcall may clobber arguments for this call.
-
- If this target defines ACCUMULATE_OUTGOING_ARGS to false, then we only
- need to precompute arguments that change the stack pointer, such as calls
- to alloca, and calls that do not pop all of their arguments. */
+ get extraneous instructions emitted as part of the libcall sequence. */
+ if ((flags & ECF_LIBCALL_BLOCK) == 0)
+ return;
for (i = 0; i < num_actuals; i++)
- if ((flags & ECF_LIBCALL_BLOCK)
- || calls_function (args[i].tree_value, !ACCUMULATE_OUTGOING_ARGS))
- {
- enum machine_mode mode;
-
- /* If this is an addressable type, we cannot pre-evaluate it. */
- if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))
- abort ();
-
- args[i].value
- = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0);
+ {
+ enum machine_mode mode;
- /* ANSI doesn't require a sequence point here,
- but PCC has one, so this will avoid some problems. */
- emit_queue ();
+ /* If this is an addressable type, we cannot pre-evaluate it. */
+ gcc_assert (!TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)));
- args[i].initial_value = args[i].value
- = protect_from_queue (args[i].value, 0);
+ args[i].initial_value = args[i].value
+ = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0);
- mode = TYPE_MODE (TREE_TYPE (args[i].tree_value));
- if (mode != args[i].mode)
- {
- args[i].value
- = convert_modes (args[i].mode, mode,
- args[i].value, args[i].unsignedp);
+ mode = TYPE_MODE (TREE_TYPE (args[i].tree_value));
+ if (mode != args[i].mode)
+ {
+ args[i].value
+ = convert_modes (args[i].mode, mode,
+ args[i].value, args[i].unsignedp);
#if defined(PROMOTE_FUNCTION_MODE) && !defined(PROMOTE_MODE)
- /* CSE will replace this only if it contains args[i].value
- pseudo, so convert it down to the declared mode using
- a SUBREG. */
- if (REG_P (args[i].value)
- && GET_MODE_CLASS (args[i].mode) == MODE_INT)
- {
- args[i].initial_value
- = gen_lowpart_SUBREG (mode, args[i].value);
- SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1;
- SUBREG_PROMOTED_UNSIGNED_SET (args[i].initial_value,
- args[i].unsignedp);
- }
+ /* CSE will replace this only if it contains args[i].value
+ pseudo, so convert it down to the declared mode using
+ a SUBREG. */
+ if (REG_P (args[i].value)
+ && GET_MODE_CLASS (args[i].mode) == MODE_INT)
+ {
+ args[i].initial_value
+ = gen_lowpart_SUBREG (mode, args[i].value);
+ SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1;
+ SUBREG_PROMOTED_UNSIGNED_SET (args[i].initial_value,
+ args[i].unsignedp);
+ }
#endif
- }
- }
+ }
+ }
}
/* Given the current state of MUST_PREALLOCATE and information about
rtx offset = ARGS_SIZE_RTX (args[i].locate.offset);
rtx slot_offset = ARGS_SIZE_RTX (args[i].locate.slot_offset);
rtx addr;
+ unsigned int align, boundary;
/* Skip this parm if it will not be passed on the stack. */
if (! args[i].pass_on_stack && args[i].reg != 0)
addr = plus_constant (addr, arg_offset);
args[i].stack = gen_rtx_MEM (args[i].mode, addr);
- set_mem_align (args[i].stack, PARM_BOUNDARY);
set_mem_attributes (args[i].stack,
TREE_TYPE (args[i].tree_value), 1);
+ align = BITS_PER_UNIT;
+ boundary = args[i].locate.boundary;
+ if (args[i].locate.where_pad != downward)
+ align = boundary;
+ else if (GET_CODE (offset) == CONST_INT)
+ {
+ align = INTVAL (offset) * BITS_PER_UNIT | boundary;
+ align = align & -align;
+ }
+ set_mem_align (args[i].stack, align);
if (GET_CODE (slot_offset) == CONST_INT)
addr = plus_constant (arg_reg, INTVAL (slot_offset));
addr = plus_constant (addr, arg_offset);
args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr);
- set_mem_align (args[i].stack_slot, PARM_BOUNDARY);
set_mem_attributes (args[i].stack_slot,
TREE_TYPE (args[i].tree_value), 1);
+ set_mem_align (args[i].stack_slot, args[i].locate.boundary);
/* Function incoming arguments may overlap with sibling call
outgoing arguments and we cannot allow reordering of reads
push_temp_slots ();
funexp = expand_expr (addr, NULL_RTX, VOIDmode, 0);
pop_temp_slots (); /* FUNEXP can't be BLKmode. */
- emit_queue ();
}
return funexp;
}
int nregs;
int size = 0;
rtx before_arg = get_last_insn ();
- /* Set to non-negative if must move a word at a time, even if just
- one word (e.g, partial == 1 && mode == DFmode). Set to -1 if
- we just use a normal move insn. This value can be zero if the
- argument is a zero size structure with no fields. */
+ /* Set non-negative if we must move a word at a time, even if
+ just one word (e.g, partial == 4 && mode == DFmode). Set
+ to -1 if we just use a normal move insn. This value can be
+ zero if the argument is a zero size structure. */
nregs = -1;
- if (partial)
- nregs = partial;
+ if (GET_CODE (reg) == PARALLEL)
+ ;
+ else if (partial)
+ {
+ gcc_assert (partial % UNITS_PER_WORD == 0);
+ nregs = partial / UNITS_PER_WORD;
+ }
else if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode)
{
size = int_size_in_bytes (TREE_TYPE (args[i].tree_value));
locations. The Irix 6 ABI has examples of this. */
if (GET_CODE (reg) == PARALLEL)
- {
- tree type = TREE_TYPE (args[i].tree_value);
- emit_group_load (reg, args[i].value, type,
- int_size_in_bytes (type));
- }
+ emit_group_move (reg, args[i].parallel_value);
/* If simple case, just do move. If normal partial, store_one_arg
has already loaded the register for us. In all other cases,
call only uses SIZE bytes at the msb end, but it doesn't
seem worth generating rtl to say that. */
reg = gen_rtx_REG (word_mode, REGNO (reg));
- x = expand_binop (word_mode, ashl_optab, reg,
- GEN_INT (shift), reg, 1, OPTAB_WIDEN);
+ x = expand_shift (LSHIFT_EXPR, word_mode, reg,
+ build_int_cst (NULL_TREE, shift),
+ reg, 1);
if (x != reg)
emit_move_insn (reg, x);
}
rtx ri = gen_rtx_REG (word_mode, REGNO (reg));
rtx x = gen_reg_rtx (word_mode);
int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT;
- optab dir = BYTES_BIG_ENDIAN ? lshr_optab : ashl_optab;
+ enum tree_code dir = BYTES_BIG_ENDIAN ? RSHIFT_EXPR
+ : LSHIFT_EXPR;
emit_move_insn (x, tem);
- x = expand_binop (word_mode, dir, x, GEN_INT (shift),
- ri, 1, OPTAB_WIDEN);
+ x = expand_shift (dir, word_mode, x,
+ build_int_cst (NULL_TREE, shift),
+ ri, 1);
if (x != ri)
emit_move_insn (ri, x);
}
use_group_regs (call_fusage, reg);
else if (nregs == -1)
use_reg (call_fusage, reg);
- else
- use_regs (call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs);
+ else if (nregs > 0)
+ use_regs (call_fusage, REGNO (reg), nregs);
}
}
}
static int
combine_pending_stack_adjustment_and_call (int unadjusted_args_size,
struct args_size *args_size,
- int preferred_unit_stack_boundary)
+ unsigned int preferred_unit_stack_boundary)
{
/* The number of bytes to pop so that the stack will be
under-aligned by UNADJUSTED_ARGS_SIZE bytes. */
HOST_WIDE_INT adjustment;
/* The alignment of the stack after the arguments are pushed, if we
just pushed the arguments without adjust the stack here. */
- HOST_WIDE_INT unadjusted_alignment;
+ unsigned HOST_WIDE_INT unadjusted_alignment;
unadjusted_alignment
= ((stack_pointer_delta + unadjusted_args_size)
return insn != NULL_RTX;
}
-static tree
-fix_unsafe_tree (tree t)
-{
- switch (unsafe_for_reeval (t))
- {
- case 0: /* Safe. */
- break;
-
- case 1: /* Mildly unsafe. */
- t = unsave_expr (t);
- break;
-
- case 2: /* Wildly unsafe. */
- {
- tree var = build_decl (VAR_DECL, NULL_TREE,
- TREE_TYPE (t));
- SET_DECL_RTL (var,
- expand_expr (t, NULL_RTX, VOIDmode, EXPAND_NORMAL));
- t = var;
- }
- break;
-
- default:
- abort ();
- }
- return t;
-}
-
-
-/* If function value *VALUE was returned at the most significant end of a
- register, shift it towards the least significant end and convert it to
- TYPE's mode. Return true and update *VALUE if some action was needed.
+/* Given that a function returns a value of mode MODE at the most
+ significant end of hard register VALUE, shift VALUE left or right
+ as specified by LEFT_P. Return true if some action was needed. */
- TYPE is the type of the function's return value, which is known not
- to have mode BLKmode. */
-
-static bool
-shift_returned_value (tree type, rtx *value)
-{
- if (targetm.calls.return_in_msb (type))
- {
- HOST_WIDE_INT shift;
-
- shift = (GET_MODE_BITSIZE (GET_MODE (*value))
- - BITS_PER_UNIT * int_size_in_bytes (type));
- if (shift > 0)
- {
- *value = expand_binop (GET_MODE (*value), lshr_optab, *value,
- GEN_INT (shift), 0, 1, OPTAB_WIDEN);
- *value = convert_to_mode (TYPE_MODE (type), *value, 0);
- return true;
- }
- }
- return false;
-}
-
-/* Remove all REG_EQUIV notes found in the insn chain. */
-
-static void
-purge_reg_equiv_notes (void)
-{
- rtx insn;
-
- for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
- {
- while (1)
- {
- rtx note = find_reg_note (insn, REG_EQUIV, 0);
- if (note)
- {
- /* Remove the note and keep looking at the notes for
- this insn. */
- remove_note (insn, note);
- continue;
- }
- break;
- }
- }
-}
-
-/* Clear RTX_UNCHANGING_P flag of incoming argument MEMs. */
-
-static void
-purge_mem_unchanging_flag (rtx x)
+bool
+shift_return_value (enum machine_mode mode, bool left_p, rtx value)
{
- RTX_CODE code;
- int i, j;
- const char *fmt;
-
- if (x == NULL_RTX)
- return;
+ HOST_WIDE_INT shift;
- code = GET_CODE (x);
-
- if (code == MEM)
- {
- if (RTX_UNCHANGING_P (x)
- && (XEXP (x, 0) == current_function_internal_arg_pointer
- || (GET_CODE (XEXP (x, 0)) == PLUS
- && XEXP (XEXP (x, 0), 0) ==
- current_function_internal_arg_pointer
- && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)))
- RTX_UNCHANGING_P (x) = 0;
- return;
- }
+ gcc_assert (REG_P (value) && HARD_REGISTER_P (value));
+ shift = GET_MODE_BITSIZE (GET_MODE (value)) - GET_MODE_BITSIZE (mode);
+ if (shift == 0)
+ return false;
- /* Scan all subexpressions. */
- fmt = GET_RTX_FORMAT (code);
- for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++)
- {
- if (*fmt == 'e')
- purge_mem_unchanging_flag (XEXP (x, i));
- else if (*fmt == 'E')
- for (j = 0; j < XVECLEN (x, i); j++)
- purge_mem_unchanging_flag (XVECEXP (x, i, j));
- }
+ /* Use ashr rather than lshr for right shifts. This is for the benefit
+ of the MIPS port, which requires SImode values to be sign-extended
+ when stored in 64-bit registers. */
+ if (!force_expand_binop (GET_MODE (value), left_p ? ashl_optab : ashr_optab,
+ value, GEN_INT (shift), value, 1, OPTAB_WIDEN))
+ gcc_unreachable ();
+ return true;
}
-
/* Generate all the code for a function call
and return an rtx for its value.
Store the value in TARGET (specified as an rtx) if convenient.
tree addr = TREE_OPERAND (exp, 0);
int i;
/* The alignment of the stack, in bits. */
- HOST_WIDE_INT preferred_stack_boundary;
+ unsigned HOST_WIDE_INT preferred_stack_boundary;
/* The alignment of the stack, in bytes. */
- HOST_WIDE_INT preferred_unit_stack_boundary;
+ unsigned HOST_WIDE_INT preferred_unit_stack_boundary;
/* The static chain value to use for this call. */
rtx static_chain_value;
/* See if this is "nothrow" function call. */
/* Warn if this value is an aggregate type,
regardless of which calling convention we are using for it. */
- if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp)))
- warning ("function call has aggregate value");
+ if (AGGREGATE_TYPE_P (TREE_TYPE (exp)))
+ warning (OPT_Waggregate_return, "function call has aggregate value");
/* If the result of a pure or const function call is ignored (or void),
and none of its arguments are volatile, we can avoid expanding the
structure_value_addr = expand_expr (return_arg, NULL_RTX,
VOIDmode, EXPAND_NORMAL);
}
- else if (target && GET_CODE (target) == MEM)
+ else if (target && MEM_P (target))
structure_value_addr = XEXP (target, 0);
else
{
/* Operand 0 is a pointer-to-function; get the type of the function. */
funtype = TREE_TYPE (addr);
- if (! POINTER_TYPE_P (funtype))
- abort ();
+ gcc_assert (POINTER_TYPE_P (funtype));
funtype = TREE_TYPE (funtype);
/* Munge the tree to split complex arguments into their imaginary
|| (ACCUMULATE_OUTGOING_ARGS
&& stack_arg_under_construction
&& structure_value_addr == virtual_outgoing_args_rtx)
- ? copy_addr_to_reg (convert_memory_address
+ ? copy_addr_to_reg (convert_memory_address
(Pmode, structure_value_addr))
: structure_value_addr);
|| (!ACCUMULATE_OUTGOING_ARGS && args_size.constant)))
structure_value_addr = copy_to_reg (structure_value_addr);
- /* Tail calls can make things harder to debug, and we're traditionally
+ /* Tail calls can make things harder to debug, and we've traditionally
pushed these optimizations into -O2. Don't try if we're already
expanding a call, as that means we're an argument. Don't try if
- there's cleanups, as we know there's code to follow the call.
-
- If rtx_equal_function_value_matters is false, that means we've
- finished with regular parsing. Which means that some of the
- machinery we use to generate tail-calls is no longer in place.
- This is most often true of sjlj-exceptions, which we couldn't
- tail-call to anyway.
+ there's cleanups, as we know there's code to follow the call. */
- If current_nesting_level () == 0, we're being called after
- the function body has been expanded. This can happen when
- setting up trampolines in expand_function_end. */
if (currently_expanding_call++ != 0
|| !flag_optimize_sibling_calls
- || !rtx_equal_function_value_matters
- || current_nesting_level () == 0
- || any_pending_cleanups ()
|| args_size.var
|| lookup_stmt_eh_region (exp) >= 0)
try_tail_call = 0;
|| !targetm.function_ok_for_sibcall (fndecl, exp)
/* Functions that do not return exactly once may not be sibcall
optimized. */
- || (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP | ECF_NORETURN))
+ || (flags & (ECF_RETURNS_TWICE | ECF_NORETURN))
|| TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (addr)))
/* If the called function is nested in the current one, it might access
some of the caller's arguments, but could clobber them beforehand if
the argument areas are shared. */
|| (fndecl && decl_function_context (fndecl) == current_function_decl)
/* If this function requires more stack slots than the current
- function, we cannot change it into a sibling call. */
- || args_size.constant > current_function_args_size
+ function, we cannot change it into a sibling call.
+ current_function_pretend_args_size is not part of the
+ stack allocated by our caller. */
+ || args_size.constant > (current_function_args_size
+ - current_function_pretend_args_size)
/* If the callee pops its own arguments, then it must pop exactly
the same number of arguments as the current function. */
|| (RETURN_POPS_ARGS (fndecl, funtype, args_size.constant)
|| !lang_hooks.decls.ok_for_sibcall (fndecl))
try_tail_call = 0;
- if (try_tail_call)
- {
- int end, inc;
- actparms = NULL_TREE;
- /* Ok, we're going to give the tail call the old college try.
- This means we're going to evaluate the function arguments
- up to three times. There are two degrees of badness we can
- encounter, those that can be unsaved and those that can't.
- (See unsafe_for_reeval commentary for details.)
-
- Generate a new argument list. Pass safe arguments through
- unchanged. For the easy badness wrap them in UNSAVE_EXPRs.
- For hard badness, evaluate them now and put their resulting
- rtx in a temporary VAR_DECL.
-
- initialize_argument_information has ordered the array for the
- order to be pushed, and we must remember this when reconstructing
- the original argument order. */
-
- if (PUSH_ARGS_REVERSED)
- {
- inc = 1;
- i = 0;
- end = num_actuals;
- }
- else
- {
- inc = -1;
- i = num_actuals - 1;
- end = -1;
- }
-
- for (; i != end; i += inc)
- {
- args[i].tree_value = fix_unsafe_tree (args[i].tree_value);
- }
- /* Do the same for the function address if it is an expression. */
- if (!fndecl)
- addr = fix_unsafe_tree (addr);
- /* Expanding one of those dangerous arguments could have added
- cleanups, but otherwise give it a whirl. */
- if (any_pending_cleanups ())
- try_tail_call = 0;
- }
-
-
/* Ensure current function's preferred stack boundary is at least
what we need. We don't have to increase alignment for recursive
functions. */
preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT;
- function_call_count++;
-
/* We want to make two insn chains; one for a sibling call, the other
for a normal call. We will select one of the two chains after
initial RTL generation is complete. */
int sibcall_failure = 0;
/* We want to emit any pending stack adjustments before the tail
recursion "call". That way we know any adjustment after the tail
- recursion call can be ignored if we indeed use the tail
+ recursion call can be ignored if we indeed use the tail
call expansion. */
int save_pending_stack_adjust = 0;
int save_stack_pointer_delta = 0;
if (pass == 0)
{
- /* Emit any queued insns now; otherwise they would end up in
- only one of the alternates. */
- emit_queue ();
-
/* State variables we need to save and restore between
iterations. */
save_pending_stack_adjust = pending_stack_adjust;
sibcall_failure instead of continuing the loop. */
start_sequence ();
- if (pass == 0)
- {
- /* We know at this point that there are not currently any
- pending cleanups. If, however, in the process of evaluating
- the arguments we were to create some, we'll need to be
- able to get rid of them. */
- expand_start_target_temps ();
- }
-
/* Don't let pending stack adjusts add up to too much.
Also, do all pending adjustments now if there is any chance
this might be a call to alloca or if we are expanding a sibling
call sequence or if we are calling a function that is to return
- with stack pointer depressed. */
+ with stack pointer depressed.
+ Also do the adjustments before a throwing call, otherwise
+ exception handling can fail; PR 19225. */
if (pending_stack_adjust >= 32
|| (pending_stack_adjust > 0
&& (flags & (ECF_MAY_BE_ALLOCA | ECF_SP_DEPRESSED)))
+ || (pending_stack_adjust > 0
+ && flag_exceptions && !(flags & ECF_NOTHROW))
|| pass == 0)
do_pending_stack_adjust ();
structure value. */
if (pass != 0 && structure_value_addr && ! structure_value_addr_parm)
{
- structure_value_addr
+ structure_value_addr
= convert_memory_address (Pmode, structure_value_addr);
emit_move_insn (struct_value,
force_reg (Pmode,
load_register_parameters (args, num_actuals, &call_fusage, flags,
pass == 0, &sibcall_failure);
- /* Perform postincrements before actually calling the function. */
- emit_queue ();
-
/* Save a pointer to the last insn before the call, so that we can
later safely search backwards to find the CALL_INSN. */
before_call = get_last_insn ();
now! */
/* Stack must be properly aligned now. */
- if (pass && stack_pointer_delta % preferred_unit_stack_boundary)
- abort ();
+ gcc_assert (!pass
+ || !(stack_pointer_delta % preferred_unit_stack_boundary));
/* Generate the actual call instruction. */
emit_call_1 (funexp, exp, fndecl, funtype, unadjusted_args_size,
next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage,
flags, & args_so_far);
+ /* If a non-BLKmode value is returned at the most significant end
+ of a register, shift the register right by the appropriate amount
+ and update VALREG accordingly. BLKmode values are handled by the
+ group load/store machinery below. */
+ if (!structure_value_addr
+ && !pcc_struct_value
+ && TYPE_MODE (TREE_TYPE (exp)) != BLKmode
+ && targetm.calls.return_in_msb (TREE_TYPE (exp)))
+ {
+ if (shift_return_value (TYPE_MODE (TREE_TYPE (exp)), false, valreg))
+ sibcall_failure = 1;
+ valreg = gen_rtx_REG (TYPE_MODE (TREE_TYPE (exp)), REGNO (valreg));
+ }
+
/* If call is cse'able, make appropriate pair of reg-notes around it.
Test valreg so we don't crash; may safely ignore `const'
if return type is void. Disable for PARALLEL return values, because
/* Expansion of block moves possibly introduced a loop that may
not appear inside libcall block. */
for (insn = insns; insn; insn = NEXT_INSN (insn))
- if (GET_CODE (insn) == JUMP_INSN)
+ if (JUMP_P (insn))
failed = true;
if (failed)
end_sequence ();
if (flag_unsafe_math_optimizations
&& fndecl
- && DECL_BUILT_IN (fndecl)
+ && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL
&& (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRT
|| DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRTF
|| DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRTL))
- note = gen_rtx_fmt_e (SQRT,
- GET_MODE (temp),
+ note = gen_rtx_fmt_e (SQRT,
+ GET_MODE (temp),
args[0].initial_value);
else
{
note = gen_rtx_EXPR_LIST (VOIDmode,
args[i].initial_value, note);
note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note);
-
+
if (flags & ECF_PURE)
note = gen_rtx_EXPR_LIST (VOIDmode,
gen_rtx_USE (VOIDmode,
if nonvolatile values are live. For functions that cannot return,
inform flow that control does not fall through. */
- if ((flags & (ECF_NORETURN | ECF_LONGJMP)) || pass == 0)
+ if ((flags & ECF_NORETURN) || pass == 0)
{
/* The barrier must be emitted
immediately after the CALL_INSN. Some ports emit more
than just a CALL_INSN above, so we must search for it here. */
rtx last = get_last_insn ();
- while (GET_CODE (last) != CALL_INSN)
+ while (!CALL_P (last))
{
last = PREV_INSN (last);
/* There was no CALL_INSN? */
- if (last == before_call)
- abort ();
+ gcc_assert (last != before_call);
}
emit_barrier_after (last);
}
}
- if (flags & ECF_LONGJMP)
- current_function_calls_longjmp = 1;
-
/* If value type not void, return an rtx for the value. */
- /* If there are cleanups to be called, don't use a hard reg as target.
- We need to double check this and see if it matters anymore. */
- if (any_pending_cleanups ())
- {
- if (target && REG_P (target)
- && REGNO (target) < FIRST_PSEUDO_REGISTER)
- target = 0;
- sibcall_failure = 1;
- }
-
if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode
|| ignore)
target = const0_rtx;
else if (structure_value_addr)
{
- if (target == 0 || GET_CODE (target) != MEM)
+ if (target == 0 || !MEM_P (target))
{
target
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)),
| TYPE_QUAL_CONST));
target = assign_temp (nt, 0, 1, 1);
- preserve_temp_slots (target);
}
if (! rtx_equal_p (target, valreg))
/* If we are setting a MEM, this code must be executed. Since it is
emitted after the call insn, sibcall optimization cannot be
performed in that case. */
- if (GET_CODE (target) == MEM)
+ if (MEM_P (target))
sibcall_failure = 1;
}
else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode)
sibcall_failure = 1;
}
else
- {
- if (shift_returned_value (TREE_TYPE (exp), &valreg))
- sibcall_failure = 1;
-
- target = copy_to_reg (valreg);
- }
+ target = copy_to_reg (valreg);
if (targetm.calls.promote_function_return(funtype))
{
- /* If we promoted this return value, make the proper SUBREG. TARGET
- might be const0_rtx here, so be careful. */
- if (REG_P (target)
- && TYPE_MODE (TREE_TYPE (exp)) != BLKmode
- && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
- {
- tree type = TREE_TYPE (exp);
- int unsignedp = TYPE_UNSIGNED (type);
- int offset = 0;
-
- /* If we don't promote as expected, something is wrong. */
- if (GET_MODE (target)
- != promote_mode (type, TYPE_MODE (type), &unsignedp, 1))
- abort ();
-
- if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN)
- && GET_MODE_SIZE (GET_MODE (target))
- > GET_MODE_SIZE (TYPE_MODE (type)))
- {
- offset = GET_MODE_SIZE (GET_MODE (target))
- - GET_MODE_SIZE (TYPE_MODE (type));
- if (! BYTES_BIG_ENDIAN)
- offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD;
- else if (! WORDS_BIG_ENDIAN)
- offset %= UNITS_PER_WORD;
- }
- target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset);
- SUBREG_PROMOTED_VAR_P (target) = 1;
- SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp);
- }
+ /* If we promoted this return value, make the proper SUBREG.
+ TARGET might be const0_rtx here, so be careful. */
+ if (REG_P (target)
+ && TYPE_MODE (TREE_TYPE (exp)) != BLKmode
+ && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
+ {
+ tree type = TREE_TYPE (exp);
+ int unsignedp = TYPE_UNSIGNED (type);
+ int offset = 0;
+ enum machine_mode pmode;
+
+ pmode = promote_mode (type, TYPE_MODE (type), &unsignedp, 1);
+ /* If we don't promote as expected, something is wrong. */
+ gcc_assert (GET_MODE (target) == pmode);
+
+ if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN)
+ && (GET_MODE_SIZE (GET_MODE (target))
+ > GET_MODE_SIZE (TYPE_MODE (type))))
+ {
+ offset = GET_MODE_SIZE (GET_MODE (target))
+ - GET_MODE_SIZE (TYPE_MODE (type));
+ if (! BYTES_BIG_ENDIAN)
+ offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD;
+ else if (! WORDS_BIG_ENDIAN)
+ offset %= UNITS_PER_WORD;
+ }
+ target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset);
+ SUBREG_PROMOTED_VAR_P (target) = 1;
+ SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp);
+ }
}
/* If size of args is variable or this was a constructor call for a stack
emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
stack_pointer_delta = old_stack_pointer_delta;
pending_stack_adjust = old_pending_adj;
+ old_stack_allocated = stack_pointer_delta - pending_stack_adjust;
stack_arg_under_construction = old_stack_arg_under_construction;
highest_outgoing_arg_in_use = initial_highest_arg_in_use;
stack_usage_map = initial_stack_usage_map;
if (args[i].aligned_regs)
free (args[i].aligned_regs);
- if (pass == 0)
- {
- /* Undo the fake expand_start_target_temps we did earlier. If
- there had been any cleanups created, we've already set
- sibcall_failure. */
- expand_end_target_temps ();
- }
-
- /* If this function is returning into a memory location marked as
- readonly, it means it is initializing that location. We normally treat
- functions as not clobbering such locations, so we need to specify that
- this one does. We do this by adding the appropriate CLOBBER to the
- CALL_INSN function usage list. This cannot be done by emitting a
- standalone CLOBBER after the call because the latter would be ignored
- by at least the delay slot scheduling pass. We do this now instead of
- adding to call_fusage before the call to emit_call_1 because TARGET
- may be modified in the meantime. */
- if (structure_value_addr != 0 && target != 0
- && GET_CODE (target) == MEM && RTX_UNCHANGING_P (target))
- add_function_usage_to
- (last_call_insn (),
- gen_rtx_EXPR_LIST (VOIDmode, gen_rtx_CLOBBER (VOIDmode, target),
- NULL_RTX));
-
insns = get_insns ();
end_sequence ();
normal_call_insns = insns;
/* Verify that we've deallocated all the stack we used. */
- if (! (flags & (ECF_NORETURN | ECF_LONGJMP))
- && old_stack_allocated != stack_pointer_delta
- - pending_stack_adjust)
- abort ();
+ gcc_assert ((flags & ECF_NORETURN)
+ || (old_stack_allocated
+ == stack_pointer_delta - pending_stack_adjust));
}
/* If something prevents making this a sibling call,
clear_pending_stack_adjust ();
emit_insn (gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx));
emit_move_insn (virtual_stack_dynamic_rtx, stack_pointer_rtx);
- save_stack_pointer ();
}
return target;
this function's incoming arguments.
At the start of RTL generation we know the only REG_EQUIV notes
- in the rtl chain are those for incoming arguments, so we can safely
- flush any REG_EQUIV note.
+ in the rtl chain are those for incoming arguments, so we can look
+ for REG_EQUIV notes between the start of the function and the
+ NOTE_INSN_FUNCTION_BEG.
This is (slight) overkill. We could keep track of the highest
argument we clobber and be more selective in removing notes, but it
does not seem to be worth the effort. */
+
void
fixup_tail_calls (void)
{
rtx insn;
- tree arg;
-
- purge_reg_equiv_notes ();
-
- /* A sibling call sequence also may invalidate RTX_UNCHANGING_P
- flag of some incoming arguments MEM RTLs, because it can write into
- those slots. We clear all those bits now.
- This is (slight) overkill, we could keep track of which arguments
- we actually write into. */
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
{
- if (INSN_P (insn))
- purge_mem_unchanging_flag (PATTERN (insn));
- }
+ /* There are never REG_EQUIV notes for the incoming arguments
+ after the NOTE_INSN_FUNCTION_BEG note, so stop if we see it. */
+ if (NOTE_P (insn)
+ && NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_BEG)
+ break;
- /* Similarly, invalidate RTX_UNCHANGING_P for any incoming
- arguments passed in registers. */
- for (arg = DECL_ARGUMENTS (current_function_decl);
- arg;
- arg = TREE_CHAIN (arg))
- {
- if (REG_P (DECL_RTL (arg)))
- RTX_UNCHANGING_P (DECL_RTL (arg)) = false;
+ while (1)
+ {
+ rtx note = find_reg_note (insn, REG_EQUIV, 0);
+ if (note)
+ {
+ /* Remove the note and keep looking at the notes for
+ this insn. */
+ remove_note (insn, note);
+ continue;
+ }
+ break;
+ }
}
}
/* Traverse an argument list in VALUES and expand all complex
arguments into their components. */
-tree
+static tree
split_complex_values (tree values)
{
tree p;
/* Traverse a list of TYPES and expand all complex types into their
components. */
-tree
+static tree
split_complex_types (tree types)
{
tree p;
case LCT_THROW:
flags = ECF_NORETURN;
break;
- case LCT_ALWAYS_RETURN:
- flags = ECF_ALWAYS_RETURN;
- break;
case LCT_RETURNS_TWICE:
flags = ECF_RETURNS_TWICE;
break;
value = gen_reg_rtx (outmode);
#else /* not PCC_STATIC_STRUCT_RETURN */
struct_value_size = GET_MODE_SIZE (outmode);
- if (value != 0 && GET_CODE (value) == MEM)
+ if (value != 0 && MEM_P (value))
mem_value = value;
else
mem_value = assign_temp (tfom, 0, 1, 1);
if (mem_value && struct_value == 0 && ! pcc_struct_value)
{
rtx addr = XEXP (mem_value, 0);
+
nargs++;
/* Make sure it is a reasonable operand for a move or push insn. */
- if (!REG_P (addr) && GET_CODE (addr) != MEM
+ if (!REG_P (addr) && !MEM_P (addr)
&& ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr)))
addr = force_operand (addr, NULL_RTX);
argvec[count].partial = 0;
argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1);
-#ifdef FUNCTION_ARG_PARTIAL_NREGS
- if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1))
- abort ();
-#endif
+ gcc_assert (targetm.calls.arg_partial_bytes (&args_so_far, Pmode,
+ NULL_TREE, 1) == 0);
locate_and_pad_parm (Pmode, NULL_TREE,
#ifdef STACK_PARMS_IN_REG_PARM_AREA
/* We cannot convert the arg value to the mode the library wants here;
must do it earlier where we know the signedness of the arg. */
- if (mode == BLKmode
- || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode))
- abort ();
-
- /* There's no need to call protect_from_queue, because
- either emit_move_insn or emit_push_insn will do that. */
+ gcc_assert (mode != BLKmode
+ && (GET_MODE (val) == mode || GET_MODE (val) == VOIDmode));
/* Make sure it is a reasonable operand for a move or push insn. */
- if (!REG_P (val) && GET_CODE (val) != MEM
+ if (!REG_P (val) && !MEM_P (val)
&& ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val)))
val = force_operand (val, NULL_RTX);
-#ifdef FUNCTION_ARG_PASS_BY_REFERENCE
- if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1))
+ if (pass_by_reference (&args_so_far, mode, NULL_TREE, 1))
{
rtx slot;
- int must_copy = 1
-#ifdef FUNCTION_ARG_CALLEE_COPIES
- && ! FUNCTION_ARG_CALLEE_COPIES (args_so_far, mode,
- NULL_TREE, 1)
-#endif
- ;
+ int must_copy
+ = !reference_callee_copied (&args_so_far, mode, NULL_TREE, 1);
/* loop.c won't look at CALL_INSN_FUNCTION_USAGE of const/pure
functions, so we have to pretend this isn't such a function. */
flags |= ECF_PURE;
}
- if (GET_MODE (val) == MEM && ! must_copy)
+ if (GET_MODE (val) == MEM && !must_copy)
slot = val;
- else if (must_copy)
+ else
{
slot = assign_temp (lang_hooks.types.type_for_mode (mode, 0),
0, 1, 1);
emit_move_insn (slot, val);
}
- else
- {
- tree type = lang_hooks.types.type_for_mode (mode, 0);
-
- slot
- = gen_rtx_MEM (mode,
- expand_expr (build1 (ADDR_EXPR,
- build_pointer_type (type),
- make_tree (type, val)),
- NULL_RTX, VOIDmode, 0));
- }
call_fusage = gen_rtx_EXPR_LIST (VOIDmode,
gen_rtx_USE (VOIDmode, slot),
mode = Pmode;
val = force_operand (XEXP (slot, 0), NULL_RTX);
}
-#endif
argvec[count].value = val;
argvec[count].mode = mode;
argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
-#ifdef FUNCTION_ARG_PARTIAL_NREGS
argvec[count].partial
- = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1);
-#else
- argvec[count].partial = 0;
-#endif
+ = targetm.calls.arg_partial_bytes (&args_so_far, mode, NULL_TREE, 1);
locate_and_pad_parm (mode, NULL_TREE,
#ifdef STACK_PARMS_IN_REG_PARM_AREA
argvec[count].partial,
NULL_TREE, &args_size, &argvec[count].locate);
- if (argvec[count].locate.size.var)
- abort ();
+ gcc_assert (!argvec[count].locate.size.var);
if (argvec[count].reg == 0 || argvec[count].partial != 0
|| reg_parm_stack_space > 0)
are to be pushed. */
for (count = 0; count < nargs; count++, argnum += inc)
{
+ enum machine_mode mode = argvec[argnum].mode;
rtx val = argvec[argnum].value;
rtx reg = argvec[argnum].reg;
int partial = argvec[argnum].partial;
/* Handle calls that pass values in multiple non-contiguous
locations. The PA64 has examples of this for library calls. */
if (reg != 0 && GET_CODE (reg) == PARALLEL)
- emit_group_load (reg, val, NULL_TREE, GET_MODE_SIZE (GET_MODE (val)));
+ emit_group_load (reg, val, NULL_TREE, GET_MODE_SIZE (mode));
else if (reg != 0 && partial == 0)
emit_move_insn (reg, val);
? hard_libcall_value (outmode) : NULL_RTX);
/* Stack must be properly aligned now. */
- if (stack_pointer_delta & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1))
- abort ();
+ gcc_assert (!(stack_pointer_delta
+ & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1)));
before_call = get_last_insn ();
if nonvolatile values are live. For functions that cannot return,
inform flow that control does not fall through. */
- if (flags & (ECF_NORETURN | ECF_LONGJMP))
+ if (flags & ECF_NORETURN)
{
/* The barrier note must be emitted
immediately after the CALL_INSN. Some ports emit more than
just a CALL_INSN above, so we must search for it here. */
rtx last = get_last_insn ();
- while (GET_CODE (last) != CALL_INSN)
+ while (!CALL_P (last))
{
last = PREV_INSN (last);
/* There was no CALL_INSN? */
- if (last == before_call)
- abort ();
+ gcc_assert (last != before_call);
}
emit_barrier_after (last);
if (GET_CODE (valreg) == PARALLEL)
{
temp = gen_reg_rtx (outmode);
- emit_group_store (temp, valreg, NULL_TREE,
+ emit_group_store (temp, valreg, NULL_TREE,
GET_MODE_SIZE (outmode));
valreg = temp;
}
for a value of mode OUTMODE,
with NARGS different arguments, passed as alternating rtx values
and machine_modes to convert them to.
- The rtx values should have been passed through protect_from_queue already.
FN_TYPE should be LCT_NORMAL for `normal' calls, LCT_CONST for `const'
calls, LCT_PURE for `pure' calls, LCT_CONST_MAKE_BLOCK for `const' calls
partial = arg->partial;
}
- if (reg != 0 && partial == 0)
- /* Being passed entirely in a register. We shouldn't be called in
- this case. */
- abort ();
-
+ /* Being passed entirely in a register. We shouldn't be called in
+ this case. */
+ gcc_assert (reg == 0 || partial != 0);
+
/* If this arg needs special alignment, don't load the registers
here. */
if (arg->n_aligned_regs != 0)
}
else
{
- /* PUSH_ROUNDING has no effect on us, because
- emit_push_insn for BLKmode is careful to avoid it. */
- if (reg && GET_CODE (reg) == PARALLEL)
- {
- /* Use the size of the elt to compute excess. */
- rtx elt = XEXP (XVECEXP (reg, 0, 0), 0);
- excess = (arg->locate.size.constant
- - int_size_in_bytes (TREE_TYPE (pval))
- + partial * GET_MODE_SIZE (GET_MODE (elt)));
- }
- else
- excess = (arg->locate.size.constant
- - int_size_in_bytes (TREE_TYPE (pval))
- + partial * UNITS_PER_WORD);
+ /* PUSH_ROUNDING has no effect on us, because emit_push_insn
+ for BLKmode is careful to avoid it. */
+ excess = (arg->locate.size.constant
+ - int_size_in_bytes (TREE_TYPE (pval))
+ + partial);
size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)),
NULL_RTX, TYPE_MODE (sizetype), 0);
}
- /* Some types will require stricter alignment, which will be
- provided for elsewhere in argument layout. */
- parm_align = MAX (PARM_BOUNDARY, TYPE_ALIGN (TREE_TYPE (pval)));
+ parm_align = arg->locate.boundary;
/* When an argument is padded down, the block is aligned to
PARM_BOUNDARY, but the actual argument isn't. */
}
}
- if ((flags & ECF_SIBCALL) && GET_CODE (arg->value) == MEM)
+ if ((flags & ECF_SIBCALL) && MEM_P (arg->value))
{
/* emit_push_insn might not work properly if arg->value and
argblock + arg->locate.offset areas overlap. */
i = INTVAL (XEXP (XEXP (x, 0), 1));
/* expand_call should ensure this. */
- if (arg->locate.offset.var || GET_CODE (size_rtx) != CONST_INT)
- abort ();
+ gcc_assert (!arg->locate.offset.var
+ && GET_CODE (size_rtx) == CONST_INT);
if (arg->locate.offset.constant > i)
{
arg->value = arg->stack_slot;
}
+ if (arg->reg && GET_CODE (arg->reg) == PARALLEL)
+ {
+ tree type = TREE_TYPE (arg->tree_value);
+ arg->parallel_value
+ = emit_group_load_into_temps (arg->reg, arg->value, type,
+ int_size_in_bytes (type));
+ }
+
/* Mark all slots this store used. */
if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)
&& argblock && ! variable_size && arg->stack)
be deferred during the rest of the arguments. */
NO_DEFER_POP;
- /* ANSI doesn't require a sequence point here,
- but PCC has one, so this will avoid some problems. */
- emit_queue ();
-
/* Free any temporary slots made in processing this argument. Show
that we might have taken the address of something and pushed that
as an operand. */
return sibcall_failure;
}
-/* Nonzero if we do not know how to pass TYPE solely in registers.
- We cannot do so in the following cases:
+/* Nonzero if we do not know how to pass TYPE solely in registers. */
- - if the type has variable size
- - if the type is marked as addressable (it is required to be constructed
- into the stack)
- - if the padding and mode of the type is such that a copy into a register
- would put it into the wrong part of the register.
+bool
+must_pass_in_stack_var_size (enum machine_mode mode ATTRIBUTE_UNUSED,
+ tree type)
+{
+ if (!type)
+ return false;
- Which padding can't be supported depends on the byte endianness.
+ /* If the type has variable size... */
+ if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
+ return true;
+
+ /* If the type is marked as addressable (it is required
+ to be constructed into the stack)... */
+ if (TREE_ADDRESSABLE (type))
+ return true;
+
+ return false;
+}
- A value in a register is implicitly padded at the most significant end.
- On a big-endian machine, that is the lower end in memory.
- So a value padded in memory at the upper end can't go in a register.
- For a little-endian machine, the reverse is true. */
+/* Another version of the TARGET_MUST_PASS_IN_STACK hook. This one
+ takes trailing padding of a structure into account. */
+/* ??? Should be able to merge these two by examining BLOCK_REG_PADDING. */
bool
-default_must_pass_in_stack (enum machine_mode mode, tree type)
+must_pass_in_stack_var_size_or_pad (enum machine_mode mode, tree type)
{
if (!type)
return false;
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