/* Convert tree expression to rtl instructions, for GNU compiler.
Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of GCC.
/* Discard any pending stack adjustment. This avoid relying on the
RTL optimizers to remove useless adjustments when we know the
stack pointer value is dead. */
-void discard_pending_stack_adjust (void)
+void
+discard_pending_stack_adjust (void)
{
stack_pointer_delta -= pending_stack_adjust;
pending_stack_adjust = 0;
&& (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
!= CODE_FOR_nothing))
{
- do_jump (convert (type, exp), if_false_label, if_true_label);
+ do_jump (fold_convert (type, exp), if_false_label, if_true_label);
break;
}
goto normal;
&& (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
!= CODE_FOR_nothing))
{
- do_jump (convert (type, exp), if_false_label, if_true_label);
+ do_jump (fold_convert (type, exp), if_false_label, if_true_label);
break;
}
goto normal;
break;
case TRUTH_AND_EXPR:
- /* High branch cost, expand as the bitwise AND of the conditions. */
- if (BRANCH_COST >= 4)
+ /* High branch cost, expand as the bitwise AND of the conditions.
+ Do the same if the RHS has side effects, because we're effectively
+ turning a TRUTH_AND_EXPR into a TRUTH_ANDIF_EXPR. */
+ if (BRANCH_COST >= 4 || TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 1)))
goto normal;
if (if_false_label == NULL_RTX)
break;
case TRUTH_OR_EXPR:
- /* High branch cost, expand as the bitwise OR of the conditions. */
- if (BRANCH_COST >= 4)
+ /* High branch cost, expand as the bitwise OR of the conditions.
+ Do the same if the RHS has side effects, because we're effectively
+ turning a TRUTH_OR_EXPR into a TRUTH_ORIF_EXPR. */
+ if (BRANCH_COST >= 4 || TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 1)))
goto normal;
if (if_true_label == NULL_RTX)
}
break;
- /* Special case:
- __builtin_expect (<test>, 0) and
- __builtin_expect (<test>, 1)
-
- We need to do this here, so that <test> is not converted to a SCC
- operation on machines that use condition code registers and COMPARE
- like the PowerPC, and then the jump is done based on whether the SCC
- operation produced a 1 or 0. */
- case CALL_EXPR:
- /* Check for a built-in function. */
- {
- tree fndecl = get_callee_fndecl (exp);
- tree arglist = TREE_OPERAND (exp, 1);
-
- if (fndecl
- && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL
- && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_EXPECT
- && arglist != NULL_TREE
- && TREE_CHAIN (arglist) != NULL_TREE)
- {
- rtx seq = expand_builtin_expect_jump (exp, if_false_label,
- if_true_label);
-
- if (seq != NULL_RTX)
- {
- emit_insn (seq);
- return;
- }
- }
- }
-
/* Fall through and generate the normal code. */
default:
normal:
- temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
+ temp = expand_normal (exp);
do_pending_stack_adjust ();
-
- if (GET_CODE (temp) == CONST_INT
- || (GET_CODE (temp) == CONST_DOUBLE && GET_MODE (temp) == VOIDmode)
- || GET_CODE (temp) == LABEL_REF)
- {
- rtx target = temp == const0_rtx ? if_false_label : if_true_label;
- if (target)
- emit_jump (target);
- }
- else if (GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
- && ! can_compare_p (NE, GET_MODE (temp), ccp_jump))
- /* Note swapping the labels gives us not-equal. */
- do_jump_by_parts_equality_rtx (temp, if_true_label, if_false_label);
- else
+ /* The RTL optimizers prefer comparisons against pseudos. */
+ if (GET_CODE (temp) == SUBREG)
{
- gcc_assert (GET_MODE (temp) != VOIDmode);
-
- /* The RTL optimizers prefer comparisons against pseudos. */
- if (GET_CODE (temp) == SUBREG)
- {
- /* Compare promoted variables in their promoted mode. */
- if (SUBREG_PROMOTED_VAR_P (temp)
- && REG_P (XEXP (temp, 0)))
- temp = XEXP (temp, 0);
- else
- temp = copy_to_reg (temp);
- }
- do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
- NE, TYPE_UNSIGNED (TREE_TYPE (exp)),
- GET_MODE (temp), NULL_RTX,
- if_false_label, if_true_label);
+ /* Compare promoted variables in their promoted mode. */
+ if (SUBREG_PROMOTED_VAR_P (temp)
+ && REG_P (XEXP (temp, 0)))
+ temp = XEXP (temp, 0);
+ else
+ temp = copy_to_reg (temp);
}
+ do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
+ NE, TYPE_UNSIGNED (TREE_TYPE (exp)),
+ GET_MODE (temp), NULL_RTX,
+ if_false_label, if_true_label);
}
if (drop_through_label)
}
}
\f
-/* Given a comparison expression EXP for values too wide to be compared
- with one insn, test the comparison and jump to the appropriate label.
- The code of EXP is ignored; we always test GT if SWAP is 0,
- and LT if SWAP is 1. */
-
-static void
-do_jump_by_parts_greater (tree exp, int swap, rtx if_false_label,
- rtx 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 = TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)));
-
- 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.
UNSIGNEDP says to do unsigned comparison.
Jump to IF_TRUE_LABEL if OP0 is greater, IF_FALSE_LABEL otherwise. */
-void
+static void
do_jump_by_parts_greater_rtx (enum machine_mode mode, int unsignedp, rtx op0,
rtx op1, rtx if_false_label, rtx if_true_label)
{
emit_label (drop_through_label);
}
-/* Given an EQ_EXPR expression EXP for values too wide to be compared
- with one insn, test the comparison and jump to the appropriate label. */
+/* Given a comparison expression EXP for values too wide to be compared
+ with one insn, test the comparison and jump to the appropriate label.
+ The code of EXP is ignored; we always test GT if SWAP is 0,
+ and LT if SWAP is 1. */
static void
-do_jump_by_parts_equality (tree exp, rtx if_false_label, rtx if_true_label)
+do_jump_by_parts_greater (tree exp, int swap, rtx if_false_label,
+ rtx if_true_label)
{
- rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
- rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
+ rtx op0 = expand_normal (TREE_OPERAND (exp, swap));
+ rtx op1 = expand_normal (TREE_OPERAND (exp, !swap));
enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
- int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
- int i;
- rtx drop_through_label = 0;
-
- if (! if_false_label)
- drop_through_label = if_false_label = gen_label_rtx ();
-
- for (i = 0; i < nwords; i++)
- do_compare_rtx_and_jump (operand_subword_force (op0, i, mode),
- operand_subword_force (op1, i, mode),
- EQ, TYPE_UNSIGNED (TREE_TYPE (exp)),
- word_mode, NULL_RTX, if_false_label, NULL_RTX);
+ int unsignedp = TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)));
- if (if_true_label)
- emit_jump (if_true_label);
- if (drop_through_label)
- emit_label (drop_through_label);
+ do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label,
+ if_true_label);
}
\f
-/* Jump according to whether OP0 is 0.
- We assume that OP0 has an integer mode that is too wide
- for the available compare insns. */
+/* Jump according to whether OP0 is 0. We assume that OP0 has an integer
+ mode, MODE, that is too wide for the available compare insns. Either
+ Either (but not both) of IF_TRUE_LABEL and IF_FALSE_LABEL may be NULL_RTX
+ to indicate drop through. */
-void
-do_jump_by_parts_equality_rtx (rtx op0, rtx if_false_label, rtx if_true_label)
+static void
+do_jump_by_parts_zero_rtx (enum machine_mode mode, rtx op0,
+ rtx if_false_label, rtx if_true_label)
{
- int nwords = GET_MODE_SIZE (GET_MODE (op0)) / UNITS_PER_WORD;
+ int nwords = GET_MODE_SIZE (mode) / UNITS_PER_WORD;
rtx part;
int i;
rtx drop_through_label = 0;
if (drop_through_label)
emit_label (drop_through_label);
}
+
+/* Test for the equality of two RTX expressions OP0 and OP1 in mode MODE,
+ where MODE is an integer mode too wide to be compared with one insn.
+ Either (but not both) of IF_TRUE_LABEL and IF_FALSE_LABEL may be NULL_RTX
+ to indicate drop through. */
+
+static void
+do_jump_by_parts_equality_rtx (enum machine_mode mode, rtx op0, rtx op1,
+ rtx if_false_label, rtx if_true_label)
+{
+ int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
+ rtx drop_through_label = 0;
+ int i;
+
+ if (op1 == const0_rtx)
+ {
+ do_jump_by_parts_zero_rtx (mode, op0, if_false_label, if_true_label);
+ return;
+ }
+ else if (op0 == const0_rtx)
+ {
+ do_jump_by_parts_zero_rtx (mode, op1, if_false_label, if_true_label);
+ return;
+ }
+
+ if (! if_false_label)
+ drop_through_label = if_false_label = gen_label_rtx ();
+
+ for (i = 0; i < nwords; i++)
+ do_compare_rtx_and_jump (operand_subword_force (op0, i, mode),
+ operand_subword_force (op1, i, mode),
+ EQ, 0, word_mode, NULL_RTX,
+ if_false_label, NULL_RTX);
+
+ if (if_true_label)
+ emit_jump (if_true_label);
+ if (drop_through_label)
+ emit_label (drop_through_label);
+}
+
+/* Given an EQ_EXPR expression EXP for values too wide to be compared
+ with one insn, test the comparison and jump to the appropriate label. */
+
+static void
+do_jump_by_parts_equality (tree exp, rtx if_false_label, rtx if_true_label)
+{
+ rtx op0 = expand_normal (TREE_OPERAND (exp, 0));
+ rtx op1 = expand_normal (TREE_OPERAND (exp, 1));
+ enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
+ do_jump_by_parts_equality_rtx (mode, op0, op1, if_false_label,
+ if_true_label);
+}
\f
/* Generate code for a comparison of OP0 and OP1 with rtx code CODE.
MODE is the machine mode of the comparison, not of the result.
unsignedp = (code == GTU || code == LTU || code == GEU || code == LEU);
}
+
if (! if_true_label)
{
dummy_true_label = 1;
if_true_label = gen_label_rtx ();
}
- emit_cmp_and_jump_insns (op0, op1, code, size, mode, unsignedp,
- if_true_label);
+ if (GET_MODE_CLASS (mode) == MODE_INT
+ && ! can_compare_p (code, mode, ccp_jump))
+ {
+ switch (code)
+ {
+ case LTU:
+ do_jump_by_parts_greater_rtx (mode, 1, op1, op0,
+ if_false_label, if_true_label);
+ break;
+
+ case LEU:
+ do_jump_by_parts_greater_rtx (mode, 1, op0, op1,
+ if_true_label, if_false_label);
+ break;
+
+ case GTU:
+ do_jump_by_parts_greater_rtx (mode, 1, op0, op1,
+ if_false_label, if_true_label);
+ break;
+
+ case GEU:
+ do_jump_by_parts_greater_rtx (mode, 1, op1, op0,
+ if_true_label, if_false_label);
+ break;
+
+ case LT:
+ do_jump_by_parts_greater_rtx (mode, 0, op1, op0,
+ if_false_label, if_true_label);
+ break;
+
+ case LE:
+ do_jump_by_parts_greater_rtx (mode, 0, op0, op1,
+ if_true_label, if_false_label);
+ break;
+
+ case GT:
+ do_jump_by_parts_greater_rtx (mode, 0, op0, op1,
+ if_false_label, if_true_label);
+ break;
+
+ case GE:
+ do_jump_by_parts_greater_rtx (mode, 0, op1, op0,
+ if_true_label, if_false_label);
+ break;
+
+ case EQ:
+ do_jump_by_parts_equality_rtx (mode, op0, op1, if_false_label,
+ if_true_label);
+ break;
+
+ case NE:
+ do_jump_by_parts_equality_rtx (mode, op0, op1, if_true_label,
+ if_false_label);
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+ }
+ else
+ emit_cmp_and_jump_insns (op0, op1, code, size, mode, unsignedp,
+ if_true_label);
if (if_false_label)
emit_jump (if_false_label);
enum rtx_code code;
/* Don't crash if the comparison was erroneous. */
- op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
+ op0 = expand_normal (TREE_OPERAND (exp, 0));
if (TREE_CODE (TREE_OPERAND (exp, 0)) == ERROR_MARK)
return;
- op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
+ op1 = expand_normal (TREE_OPERAND (exp, 1));
if (TREE_CODE (TREE_OPERAND (exp, 1)) == ERROR_MARK)
return;
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