/* Convert tree expression to rtl instructions, for GNU compiler.
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.
#include "expr.h"
#include "optabs.h"
#include "langhooks.h"
+#include "ggc.h"
+static bool prefer_and_bit_test (enum machine_mode, int);
static void do_jump_by_parts_greater (tree, int, rtx, rtx);
static void do_jump_by_parts_equality (tree, rtx, rtx);
static void do_compare_and_jump (tree, enum rtx_code, enum rtx_code, rtx,
void
clear_pending_stack_adjust (void)
{
-#ifdef EXIT_IGNORE_STACK
if (optimize > 0
&& (! flag_omit_frame_pointer || current_function_calls_alloca)
&& EXIT_IGNORE_STACK
stack_pointer_delta -= pending_stack_adjust,
pending_stack_adjust = 0;
}
-#endif
}
/* Pop any previously-pushed arguments that have not been popped yet. */
do_jump (exp, NULL_RTX, label);
}
+/* Used internally by prefer_and_bit_test. */
+
+static GTY(()) rtx and_reg;
+static GTY(()) rtx and_test;
+static GTY(()) rtx shift_test;
+
+/* Compare the relative costs of "(X & (1 << BITNUM))" and "(X >> BITNUM) & 1",
+ where X is an arbitrary register of mode MODE. Return true if the former
+ is preferred. */
+
+static bool
+prefer_and_bit_test (enum machine_mode mode, int bitnum)
+{
+ if (and_test == 0)
+ {
+ /* Set up rtxes for the two variations. Use NULL as a placeholder
+ for the BITNUM-based constants. */
+ and_reg = gen_rtx_REG (mode, FIRST_PSEUDO_REGISTER);
+ and_test = gen_rtx_AND (mode, and_reg, NULL);
+ shift_test = gen_rtx_AND (mode, gen_rtx_ASHIFTRT (mode, and_reg, NULL),
+ const1_rtx);
+ }
+ else
+ {
+ /* Change the mode of the previously-created rtxes. */
+ PUT_MODE (and_reg, mode);
+ PUT_MODE (and_test, mode);
+ PUT_MODE (shift_test, mode);
+ PUT_MODE (XEXP (shift_test, 0), mode);
+ }
+
+ /* Fill in the integers. */
+ XEXP (and_test, 1) = GEN_INT ((unsigned HOST_WIDE_INT) 1 << bitnum);
+ XEXP (XEXP (shift_test, 0), 1) = GEN_INT (bitnum);
+
+ return (rtx_cost (and_test, IF_THEN_ELSE)
+ <= rtx_cost (shift_test, IF_THEN_ELSE));
+}
+
/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
the result is zero, or IF_TRUE_LABEL if the result is one.
Either of IF_FALSE_LABEL and IF_TRUE_LABEL may be zero,
tree type;
enum machine_mode mode;
-#ifdef MAX_INTEGER_COMPUTATION_MODE
- check_max_integer_computation_mode (exp);
-#endif
-
emit_queue ();
switch (code)
case UNSAVE_EXPR:
do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
TREE_OPERAND (exp, 0)
- = (*lang_hooks.unsave_expr_now) (TREE_OPERAND (exp, 0));
+ = lang_hooks.unsave_expr_now (TREE_OPERAND (exp, 0));
break;
case NOP_EXPR:
do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
break;
- case WITH_RECORD_EXPR:
- /* Put the object on the placeholder list, recurse through our first
- operand, and pop the list. */
- placeholder_list = tree_cons (TREE_OPERAND (exp, 1), NULL_TREE,
- placeholder_list);
- do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
- placeholder_list = TREE_CHAIN (placeholder_list);
- break;
-
#if 0
/* This is never less insns than evaluating the PLUS_EXPR followed by
a test and can be longer if the test is eliminated. */
break;
case BIT_AND_EXPR:
+ /* fold_single_bit_test() converts (X & (1 << C)) into (X >> C) & 1.
+ See if the former is preferred for jump tests and restore it
+ if so. */
+ if (TREE_CODE (TREE_OPERAND (exp, 0)) == RSHIFT_EXPR
+ && integer_onep (TREE_OPERAND (exp, 1)))
+ {
+ tree arg = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
+ tree shift = TREE_OPERAND (TREE_OPERAND (exp, 0), 1);
+ tree one = TREE_OPERAND (exp, 1);
+ tree argtype = TREE_TYPE (arg);
+ if (TREE_CODE (shift) == INTEGER_CST
+ && compare_tree_int (shift, 0) > 0
+ && compare_tree_int (shift, HOST_BITS_PER_WIDE_INT) < 0
+ && prefer_and_bit_test (TYPE_MODE (argtype),
+ TREE_INT_CST_LOW (shift)))
+ {
+ do_jump (build (BIT_AND_EXPR, argtype, arg,
+ fold (build (LSHIFT_EXPR, argtype, one, shift))),
+ if_false_label, if_true_label);
+ break;
+ }
+ }
+
/* If we are AND'ing with a small constant, do this comparison in the
smallest type that fits. If the machine doesn't have comparisons
that small, it will be converted back to the wider comparison.
&& TYPE_PRECISION (TREE_TYPE (exp)) <= HOST_BITS_PER_WIDE_INT
&& (i = tree_floor_log2 (TREE_OPERAND (exp, 1))) >= 0
&& (mode = mode_for_size (i + 1, MODE_INT, 0)) != BLKmode
- && (type = (*lang_hooks.types.type_for_mode) (mode, 1)) != 0
+ && (type = lang_hooks.types.type_for_mode (mode, 1)) != 0
&& TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
&& (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
!= CODE_FOR_nothing))
get_inner_reference (exp, &bitsize, &bitpos, &offset, &mode,
&unsignedp, &volatilep);
- type = (*lang_hooks.types.type_for_size) (bitsize, unsignedp);
+ type = lang_hooks.types.type_for_size (bitsize, unsignedp);
if (! SLOW_BYTE_ACCESS
&& type != 0 && bitsize >= 0
&& TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
temp = copy_to_reg (temp);
}
do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
- NE, TREE_UNSIGNED (TREE_TYPE (exp)),
+ NE, TYPE_UNSIGNED (TREE_TYPE (exp)),
GET_MODE (temp), NULL_RTX,
if_false_label, if_true_label);
}
rtx op0 = expand_expr (TREE_OPERAND (exp, swap), NULL_RTX, VOIDmode, 0);
rtx op1 = expand_expr (TREE_OPERAND (exp, !swap), NULL_RTX, VOIDmode, 0);
enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
- int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)));
+ int unsignedp = TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)));
- do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label, if_true_label);
+ do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label,
+ if_true_label);
}
/* Compare OP0 with OP1, word at a time, in mode MODE.
for (i = 0; i < nwords; i++)
do_compare_rtx_and_jump (operand_subword_force (op0, i, mode),
operand_subword_force (op1, i, mode),
- EQ, TREE_UNSIGNED (TREE_TYPE (exp)),
+ EQ, TYPE_UNSIGNED (TREE_TYPE (exp)),
word_mode, NULL_RTX, if_false_label, NULL_RTX);
if (if_true_label)
do_pending_stack_adjust ();
ucode = unsignedp ? unsigned_condition (code) : code;
- if ((tem = simplify_relational_operation (ucode, mode, op0, op1)) != 0)
+ tem = simplify_const_relational_operation (ucode, mode, op0, op1);
+ if (tem != 0)
return tem;
#if 0
do_pending_stack_adjust ();
ucode = unsignedp ? unsigned_condition (code) : code;
- if ((tem = simplify_relational_operation (ucode, mode, op0, op1)) != 0)
+ tem = simplify_const_relational_operation (ucode, mode, op0, op1);
+ if (tem != 0)
{
if (tem == const_true_rtx)
{
type = TREE_TYPE (TREE_OPERAND (exp, 1));
mode = TYPE_MODE (type);
}
- unsignedp = TREE_UNSIGNED (type);
+ unsignedp = TYPE_UNSIGNED (type);
code = unsignedp ? unsigned_code : signed_code;
#ifdef HAVE_canonicalize_funcptr_for_compare
? expr_size (TREE_OPERAND (exp, 0)) : NULL_RTX),
if_false_label, if_true_label);
}
+
+#include "gt-dojump.h"
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