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re PR rtl-optimization/48141 (DSE compile time hog) 

PR rtl-optimization/48141
	* dse.c (record_store): If no positions are needed in an insn
	that cannot be deleted, at least unchain it from active_local_stores.

	* gcc.dg/pr48141.c: New test.

From-SVN: r171089
This commit is contained in:
Jakub Jelinek 2011-03-17 13:35:04 +01:00 committed by Jakub Jelinek
parent cb21e9cdf7
commit 1b6fa86002
4 changed files with 32 additions and 4 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-03-17 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/48141
* dse.c (record_store): If no positions are needed in an insn
that cannot be deleted, at least unchain it from active_local_stores.
2011-03-16 Dodji Seketeli <dodji@redhat.com>
PR debug/47510

6
gcc/dse.c
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@ -1,5 +1,5 @@
/* RTL dead store elimination.
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Richard Sandiford <rsandifor@codesourcery.com>
@ -1530,8 +1530,7 @@ record_store (rtx body, bb_info_t bb_info)
/* An insn can be deleted if every position of every one of
its s_infos is zero. */
if (any_positions_needed_p (s_info)
|| ptr->cannot_delete)
if (any_positions_needed_p (s_info))
del = false;
if (del)
@ -1543,6 +1542,7 @@ record_store (rtx body, bb_info_t bb_info)
else
active_local_stores = ptr->next_local_store;
if (!insn_to_delete->cannot_delete)
delete_dead_store_insn (insn_to_delete);
}
else

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2011-03-17 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/48141
* gcc.dg/pr48141.c: New test.
2011-03-16 Jason Merrill <jason@redhat.com>
* g++.dg/cpp0x/constexpr-48089.C: New.

17
gcc/testsuite/gcc.dg/pr48141.c Normal file
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@ -0,0 +1,17 @@
/* PR rtl-optimization/48141 */
/* { dg-do compile } */
/* { dg-options "-O" } */
#define A i = 0;
#define B A A A A A A A A A A
#define C B B B B B B B B B B
#define D C C C C C C C C C C
#define E D D D D D D D D D D
int
foo (void)
{
volatile int i = 0;
E E E E E E E E E E E
return 0;
}