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re PR rtl-optimization/54294 ([alpha] Bootstrap comparison failure due to fwprop handling of debug insns)

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PR rtl-optimization/54294
	* fwprop.c (all_uses_available_at): Ignore debug insns in between
	def_insn and target_insn when checking whether the shortcut is
	possible.

From-SVN: r190541
This commit is contained in:
Jakub Jelinek 2012-08-20 20:56:49 +02:00 committed by Jakub Jelinek
parent 59e08d4f09
commit 07bc8ae8ab
2 changed files with 15 additions and 4 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2012-08-20 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/54294
* fwprop.c (all_uses_available_at): Ignore debug insns in between
def_insn and target_insn when checking whether the shortcut is
possible.
2012-08-20 Eric Botcazou <ebotcazou@adacore.com>
* config/sparc/sparc.h (MAX_FIXED_MODE_SIZE): Define.

12
gcc/fwprop.c
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@ -1,5 +1,5 @@
/* RTL-based forward propagation pass for GNU compiler.
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Free Software Foundation, Inc.
Contributed by Paolo Bonzini and Steven Bosscher.
@ -799,13 +799,17 @@ all_uses_available_at (rtx def_insn, rtx target_insn)
df_ref *use_rec;
struct df_insn_info *insn_info = DF_INSN_INFO_GET (def_insn);
rtx def_set = single_set (def_insn);
rtx next;
gcc_assert (def_set);
/* If target_insn comes right after def_insn, which is very common
for addresses, we can use a quicker test. */
if (NEXT_INSN (def_insn) == target_insn
&& REG_P (SET_DEST (def_set)))
for addresses, we can use a quicker test. Ignore debug insns
other than target insns for this. */
next = NEXT_INSN (def_insn);
while (next && next != target_insn && DEBUG_INSN_P (next))
next = NEXT_INSN (next);
if (next == target_insn && REG_P (SET_DEST (def_set)))
{
rtx def_reg = SET_DEST (def_set);