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

Backported from mainline
	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.

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

From-SVN: r172132
This commit is contained in:
Jakub Jelinek 2011-04-07 23:27:02 +02:00 committed by Jakub Jelinek
parent 438d2301ba
commit c404d187c8
4 changed files with 35 additions and 4 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2011-04-07 Jakub Jelinek <jakub@redhat.com>
Backported from mainline
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.
2011-04-07 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/46491

8
gcc/dse.c
View File

@ -1588,8 +1588,7 @@ 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)
@ -1600,8 +1599,9 @@ record_store (rtx body, bb_info_t bb_info)
last->next_local_store = ptr->next_local_store;
else
active_local_stores = ptr->next_local_store;
delete_dead_store_insn (insn_to_delete);
if (!insn_to_delete->cannot_delete)
delete_dead_store_insn (insn_to_delete);
}
else
last = ptr;

5
gcc/testsuite/ChangeLog
View File

@ -1,6 +1,11 @@
2011-04-07 Jakub Jelinek <jakub@redhat.com>
Backported from mainline
2011-03-17 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/48141
* gcc.dg/pr48141.c: New test.
2010-11-15 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/46491

17
gcc/testsuite/gcc.dg/pr48141.c Normal file
View File

@ -0,0 +1,17 @@
/* PR rtl-optimization/48141 */
/* { dg-do compile } */
/* { dg-options "-O -fno-tree-fre" } */
#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;
}