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re PR middle-end/45355 (FAIL: gcc.c-torture/compile/pr43164.c) 

PR middle-end/45355
	* combine.c (try_combine): Use reg_overlap_mentioned_p rather than
	dead_or_set_p when computing i0_feeds_i2_n.

From-SVN: r163546
This commit is contained in:
Bernd Schmidt 2010-08-25 14:08:23 +00:00 committed by Bernd Schmidt
parent 1cf01301ac
commit 4942fc569c
2 changed files with 7 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2010-08-25 Bernd Schmidt <bernds@codesourcery.com>
PR middle-end/45355
* combine.c (try_combine): Use reg_overlap_mentioned_p rather than
dead_or_set_p when computing i0_feeds_i2_n.
2010-08-25 Richard Guenther <rguenther@suse.de>
PR lto/44562

2
gcc/combine.c
View File

@ -2862,7 +2862,7 @@ try_combine (rtx i3, rtx i2, rtx i1, rtx i0, int *new_direct_jump_p)
i1_feeds_i2_n = i1 && insn_a_feeds_b (i1, i2);
i0_feeds_i1_n = i0 && insn_a_feeds_b (i0, i1);
i0_feeds_i2_n = (i0 && (!i0_feeds_i1_n ? insn_a_feeds_b (i0, i2)
: (!dead_or_set_p (i1, i0dest)
: (!reg_overlap_mentioned_p (i1dest, i0dest)
&& reg_overlap_mentioned_p (i0dest, i2src))));
/* Ensure that I3's pattern can be the destination of combines. */