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re PR target/19672 (Performance regression in simple loop code)

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2005-10-18  Paolo Bonzini  <bonzini@gnu.org>

	PR #19672
	* dojump.c (do_jump): Handle TRUTH_AND_EXPR and TRUTH_OR_EXPR here.

From-SVN: r105606
This commit is contained in:
Paolo Bonzini 2005-10-19 10:37:31 +00:00
parent 2cdc88b64d
commit d1f36c51be
2 changed files with 43 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-10-18 Paolo Bonzini <bonzini@gnu.org>
PR #19672
* dojump.c (do_jump): Handle TRUTH_AND_EXPR and TRUTH_OR_EXPR here.
2005-10-18 Daniel Berlin <dberlin@dberlin.org>
Fix PR tree-optimization/24231
@ -5,7 +10,7 @@
* tree-ssa-pre.c (try_look_through_load): Skip abnormal phi names
(compute_avail): Ditto.
2006-10-18 Richard Henderson <rth@redhat.com>
2005-10-18 Richard Henderson <rth@redhat.com>
PR target/24428
* config/i386/i386.c (legitimate_constant_p): Check

38
gcc/dojump.c
View File

@ -510,6 +510,42 @@ do_jump (tree exp, rtx if_false_label, rtx if_true_label)
}
break;
case TRUTH_AND_EXPR:
/* High branch cost, expand as the bitwise AND of the conditions. */
if (BRANCH_COST >= 4)
goto normal;
if (if_false_label == NULL_RTX)
{
drop_through_label = gen_label_rtx ();
do_jump (TREE_OPERAND (exp, 0), drop_through_label, NULL_RTX);
do_jump (TREE_OPERAND (exp, 1), NULL_RTX, if_true_label);
}
else
{
do_jump (TREE_OPERAND (exp, 0), if_false_label, NULL_RTX);
do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
}
break;
case TRUTH_OR_EXPR:
/* High branch cost, expand as the bitwise OR of the conditions. */
if (BRANCH_COST >= 4)
goto normal;
if (if_true_label == NULL_RTX)
{
drop_through_label = gen_label_rtx ();
do_jump (TREE_OPERAND (exp, 0), NULL_RTX, drop_through_label);
do_jump (TREE_OPERAND (exp, 1), if_false_label, NULL_RTX);
}
else
{
do_jump (TREE_OPERAND (exp, 0), NULL_RTX, if_true_label);
do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
}
break;
/* Special case:
__builtin_expect (<test>, 0) and
__builtin_expect (<test>, 1)
@ -540,8 +576,8 @@ do_jump (tree exp, rtx if_false_label, rtx if_true_label)
}
}
}
/* Fall through and generate the normal code. */
default:
normal:
temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);