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ifcvt.c (noce_process_if_block): Try to handle only the then block if the else block exists but isn't suitable.

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* ifcvt.c (noce_process_if_block): Try to handle only the then
block if the else block exists but isn't suitable.

From-SVN: r132803
This commit is contained in:
Alexandre Oliva 2008-03-01 18:22:52 +00:00 committed by Alexandre Oliva
parent 5eb4a9af17
commit 89c3cbc686
2 changed files with 14 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2008-03-01 Alexandre Oliva <aoliva@redhat.com>
* ifcvt.c (noce_process_if_block): Try to handle only the then
block if the else block exists but isn't suitable.
2008-03-01 Janne Blomqvist <jb@gcc.gnu.org>
PR gcc/35063

9
gcc/ifcvt.c
View File

@ -2245,6 +2245,7 @@ noce_process_if_block (struct noce_if_info *if_info)
|| !NONJUMP_INSN_P (insn_b)
|| (set_b = single_set (insn_b)) == NULL_RTX
|| ! rtx_equal_p (x, SET_DEST (set_b))
|| ! noce_operand_ok (SET_SRC (set_b))
|| reg_overlap_mentioned_p (x, SET_SRC (set_b))
|| modified_between_p (SET_SRC (set_b),
PREV_INSN (if_info->cond_earliest), jump)
@ -2290,6 +2291,7 @@ noce_process_if_block (struct noce_if_info *if_info)
if (! noce_operand_ok (a) || ! noce_operand_ok (b))
return FALSE;
retry:
/* Set up the info block for our subroutines. */
if_info->insn_a = insn_a;
if_info->insn_b = insn_b;
@ -2387,6 +2389,13 @@ noce_process_if_block (struct noce_if_info *if_info)
goto success;
}
if (!else_bb && set_b)
{
insn_b = set_b = NULL_RTX;
b = orig_x;
goto retry;
}
return FALSE;
success: