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* [Bug tree-optimization/58958] New: [4.9 Regression] Wrong aliasing info for variable index
@ 2013-11-01 10:01 glisse at gcc dot gnu.org
2013-11-04 14:29 ` [Bug tree-optimization/58958] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: glisse at gcc dot gnu.org @ 2013-11-01 10:01 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58958
Bug ID: 58958
Summary: [4.9 Regression] Wrong aliasing info for variable
index
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: glisse at gcc dot gnu.org
double a[10];
bool f(int n){
a[3]=42;
__builtin_memset(&a[n],3,sizeof(double));
return a[3]==42;
}
is optimized to:
bool f(int) (int n)
{
double * _4;
<bb 2>:
a[3] = 4.2e+1;
_4 = &a[n_3(D)];
__builtin_memset (_4, 3, 8);
return 1;
}
This is the issue described here:
http://gcc.gnu.org/ml/gcc-patches/2013-10/msg02558.html
ao_ref_init_from_ptr_and_size makes an unsafe use of get_ref_base_and_extent.
Maybe relying on get_addr_base_and_unit_offset would be better?
The testcase is a regression, although the issue preexisted.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/58958] [4.9 Regression] Wrong aliasing info for variable index
2013-11-01 10:01 [Bug tree-optimization/58958] New: [4.9 Regression] Wrong aliasing info for variable index glisse at gcc dot gnu.org
@ 2013-11-04 14:29 ` rguenth at gcc dot gnu.org
2013-11-05 13:03 ` glisse at gcc dot gnu.org
2013-11-05 13:04 ` glisse at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-04 14:29 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58958
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-11-04
Target Milestone|--- |4.9.0
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/58958] [4.9 Regression] Wrong aliasing info for variable index
2013-11-01 10:01 [Bug tree-optimization/58958] New: [4.9 Regression] Wrong aliasing info for variable index glisse at gcc dot gnu.org
2013-11-04 14:29 ` [Bug tree-optimization/58958] " rguenth at gcc dot gnu.org
@ 2013-11-05 13:03 ` glisse at gcc dot gnu.org
2013-11-05 13:04 ` glisse at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: glisse at gcc dot gnu.org @ 2013-11-05 13:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58958
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Author: glisse
Date: Tue Nov 5 13:01:06 2013
New Revision: 204389
URL: http://gcc.gnu.org/viewcvs?rev=204389&root=gcc&view=rev
Log:
2013-11-05 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/58958
gcc/
* tree-ssa-alias.c (ao_ref_init_from_ptr_and_size): Use
get_addr_base_and_unit_offset instead of get_ref_base_and_extent.
gcc/testsuite/
* gcc.dg/tree-ssa/pr58958.c: New file.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr58958.c (with props)
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-alias.c
Propchange: trunk/gcc/testsuite/gcc.dg/tree-ssa/pr58958.c
('svn:eol-style' added)
Propchange: trunk/gcc/testsuite/gcc.dg/tree-ssa/pr58958.c
('svn:keywords' added)
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/58958] [4.9 Regression] Wrong aliasing info for variable index
2013-11-01 10:01 [Bug tree-optimization/58958] New: [4.9 Regression] Wrong aliasing info for variable index glisse at gcc dot gnu.org
2013-11-04 14:29 ` [Bug tree-optimization/58958] " rguenth at gcc dot gnu.org
2013-11-05 13:03 ` glisse at gcc dot gnu.org
@ 2013-11-05 13:04 ` glisse at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: glisse at gcc dot gnu.org @ 2013-11-05 13:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58958
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-11-01 10:01 [Bug tree-optimization/58958] New: [4.9 Regression] Wrong aliasing info for variable index glisse at gcc dot gnu.org
2013-11-04 14:29 ` [Bug tree-optimization/58958] " rguenth at gcc dot gnu.org
2013-11-05 13:03 ` glisse at gcc dot gnu.org
2013-11-05 13:04 ` glisse at gcc dot gnu.org
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