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re PR debug/46252 (-fcompare-debug failure (length) with -O -frerun-cse-after-loop -fno-tree-loop-optimize -funroll-loops)

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PR debug/46252
	* reload1.c (delete_dead_insn): Use prev_active_insn instead of
	prev_real_insn.
	* gcse.c (insert_insn_end_basic_block): Likewise.

	* gcc.dg/pr46252.c: New test.

From-SVN: r166232
This commit is contained in:
Jakub Jelinek 2010-11-03 09:38:42 +01:00 committed by Jakub Jelinek
parent 80ab32d69e
commit 03f43d3d3c
5 changed files with 25 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,5 +1,10 @@
2010-11-03 Jakub Jelinek <jakub@redhat.com>
PR debug/46252
* reload1.c (delete_dead_insn): Use prev_active_insn instead of
prev_real_insn.
* gcse.c (insert_insn_end_basic_block): Likewise.
PR rtl-optimization/46034
PR rtl-optimization/46212
PR rtl-optimization/46248

2
gcc/gcse.c
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@ -3574,7 +3574,7 @@ insert_insn_end_basic_block (struct expr *expr, basic_block bb)
the new instruction just before the tablejump. */
if (GET_CODE (PATTERN (insn)) == ADDR_VEC
|| GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC)
insn = prev_real_insn (insn);
insn = prev_active_insn (insn);
#ifdef HAVE_cc0
/* FIXME: 'twould be nice to call prev_cc0_setter here but it aborts

2
gcc/reload1.c
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@ -2112,7 +2112,7 @@ spill_failure (rtx insn, enum reg_class rclass)
static void
delete_dead_insn (rtx insn)
{
rtx prev = prev_real_insn (insn);
rtx prev = prev_active_insn (insn);
rtx prev_dest;
/* If the previous insn sets a register that dies in our insn, delete it

3
gcc/testsuite/ChangeLog
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@ -1,5 +1,8 @@
2010-11-03 Jakub Jelinek <jakub@redhat.com>
PR debug/46252
* gcc.dg/pr46252.c: New test.
PR rtl-optimization/46034
PR rtl-optimization/46212
PR rtl-optimization/46248

15
gcc/testsuite/gcc.dg/pr46252.c Normal file
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@ -0,0 +1,15 @@
/* PR debug/46252 */
/* { dg-do compile } */
/* { dg-options "-O -frerun-cse-after-loop -fno-tree-loop-optimize -funroll-loops -fcompare-debug" } */
void
foo (float *f)
{
int i;
for (i = 0; i < 4; i++)
f[i] = i;
bar ();
for (i = 0; i < 4; i++)
if (f[i] != i)
__builtin_abort ();
}