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* [Bug c/49926] New: ice in process_use, at tree-vect-stmts.c:405
@ 2011-07-31 21:37 regehr at cs dot utah.edu
2011-07-31 22:34 ` [Bug tree-optimization/49926] [4.7 Regression] " jakub at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: regehr at cs dot utah.edu @ 2011-07-31 21:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926
Summary: ice in process_use, at tree-vect-stmts.c:405
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: regehr@cs.utah.edu
CC: chenyang@cs.utah.edu
[regehr@gamow tmp044]$ current-gcc -Ofast -c small.c -w
small.c: In function 'func_66':
small.c:4:6: internal compiler error: in process_use, at tree-vect-stmts.c:405
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
[regehr@gamow tmp044]$ cat small.c
int g_93;
int g_163;
void func_66 (int p_68, int p_69)
{
int l_77[0];
int *l_171 = &g_93;
int l_201;
int l_224;
lbl_278:
{
int *l_225 = 0;
*l_171 = (*l_225 = l_224, 0);
}
if (l_201 = p_68--)
for (; g_163; g_163 += 1)
{
int *l_256 = &l_201;
int *l_257 = &l_224;
*l_257 = *l_256 &= *l_171 &= 1;
*l_256 &= l_77[g_163];
}
goto lbl_278;
}
[regehr@gamow tmp044]$ current-gcc -v
Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r176967-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r176967-install
--program-prefix=r176967- --enable-languages=c,c++
Thread model: posix
gcc version 4.7.0 20110731 (experimental) (GCC)
[regehr@gamow tmp044]$
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/49926] [4.7 Regression] ice in process_use, at tree-vect-stmts.c:405
2011-07-31 21:37 [Bug c/49926] New: ice in process_use, at tree-vect-stmts.c:405 regehr at cs dot utah.edu
@ 2011-07-31 22:34 ` jakub at gcc dot gnu.org
2011-07-31 22:52 ` jakub at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-07-31 22:34 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Keywords| |ice-on-valid-code
Last reconfirmed| |2011.07.31 22:33:53
Component|c |tree-optimization
CC| |jakub at gcc dot gnu.org
Ever Confirmed|0 |1
Summary|ice in process_use, at |[4.7 Regression] ice in
|tree-vect-stmts.c:405 |process_use, at
| |tree-vect-stmts.c:405
Target Milestone|--- |4.7.0
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-31 22:33:53 UTC ---
Confirmed, started at http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=173856
Reduced testcase at -O3 on x86_64-linux:
int b, c[10];
void
foo (unsigned int x, int y, int z, int *w)
{
do
{
*w = z;
y = x;
if (y)
for (b = -4; b; b++)
{
z = y &= 1;
y &= c[b + 4];
}
}
while (1);
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/49926] [4.7 Regression] ice in process_use, at tree-vect-stmts.c:405
2011-07-31 21:37 [Bug c/49926] New: ice in process_use, at tree-vect-stmts.c:405 regehr at cs dot utah.edu
2011-07-31 22:34 ` [Bug tree-optimization/49926] [4.7 Regression] " jakub at gcc dot gnu.org
@ 2011-07-31 22:52 ` jakub at gcc dot gnu.org
2011-08-01 6:17 ` irar at il dot ibm.com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-07-31 22:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-31 22:51:30 UTC ---
Actually, that was over-simplified, that crashed just at r173856 and a few
hundred revisions afterwards, this fails even with current trunk at -O3:
int a, b, c[10];
void
foo (unsigned int x, int y, int z, int *w)
{
do
{
*w = z;
y = x;
if (y)
for (b = -4; b; b++)
{
z = y &= a &= 1;
y &= c[b + 4];
}
}
while (1);
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/49926] [4.7 Regression] ice in process_use, at tree-vect-stmts.c:405
2011-07-31 21:37 [Bug c/49926] New: ice in process_use, at tree-vect-stmts.c:405 regehr at cs dot utah.edu
2011-07-31 22:34 ` [Bug tree-optimization/49926] [4.7 Regression] " jakub at gcc dot gnu.org
2011-07-31 22:52 ` jakub at gcc dot gnu.org
@ 2011-08-01 6:17 ` irar at il dot ibm.com
2011-08-01 15:15 ` irar at il dot ibm.com
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: irar at il dot ibm.com @ 2011-08-01 6:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926
Ira Rosen <irar at il dot ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |irar at il dot ibm.com
AssignedTo|unassigned at gcc dot |irar at gcc dot gnu.org
|gnu.org |
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/49926] [4.7 Regression] ice in process_use, at tree-vect-stmts.c:405
2011-07-31 21:37 [Bug c/49926] New: ice in process_use, at tree-vect-stmts.c:405 regehr at cs dot utah.edu
` (2 preceding siblings ...)
2011-08-01 6:17 ` irar at il dot ibm.com
@ 2011-08-01 15:15 ` irar at il dot ibm.com
2011-08-01 16:59 ` irar at gcc dot gnu.org
2011-08-02 7:01 ` irar at il dot ibm.com
5 siblings, 0 replies; 7+ messages in thread
From: irar at il dot ibm.com @ 2011-08-01 15:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926
--- Comment #3 from Ira Rosen <irar at il dot ibm.com> 2011-08-01 15:14:50 UTC ---
I am testing this patch:
Index: tree-vect-loop.c
===================================================================
--- tree-vect-loop.c (revision 177007)
+++ tree-vect-loop.c (working copy)
@@ -1730,7 +1730,7 @@
tree lhs;
imm_use_iterator imm_iter;
use_operand_p use_p;
- int nloop_uses, size = 0;
+ int nloop_uses, size = 0, n_out_of_loop_uses;
bool found = false;
if (loop != vect_loop)
@@ -1741,6 +1741,7 @@
while (1)
{
nloop_uses = 0;
+ n_out_of_loop_uses = 0;
FOR_EACH_IMM_USE_FAST (use_p, imm_iter, lhs)
{
gimple use_stmt = USE_STMT (use_p);
@@ -1757,16 +1758,22 @@
break;
}
- if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt))
- && vinfo_for_stmt (use_stmt)
- && !STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (use_stmt)))
- {
- loop_use_stmt = use_stmt;
- nloop_uses++;
- }
+ if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt)))
+ {
+ if (vinfo_for_stmt (use_stmt)
+ && !STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (use_stmt)))
+ {
+ loop_use_stmt = use_stmt;
+ nloop_uses++;
+ }
+ }
+ else
+ n_out_of_loop_uses++;
- if (nloop_uses > 1)
- return false;
+ /* There are can be either a single use in the loop or two uses in
+ phi nodes. */
+ if (nloop_uses > 1 || (n_out_of_loop_uses && nloop_uses))
+ return false;
}
if (found)
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/49926] [4.7 Regression] ice in process_use, at tree-vect-stmts.c:405
2011-07-31 21:37 [Bug c/49926] New: ice in process_use, at tree-vect-stmts.c:405 regehr at cs dot utah.edu
` (3 preceding siblings ...)
2011-08-01 15:15 ` irar at il dot ibm.com
@ 2011-08-01 16:59 ` irar at gcc dot gnu.org
2011-08-02 7:01 ` irar at il dot ibm.com
5 siblings, 0 replies; 7+ messages in thread
From: irar at gcc dot gnu.org @ 2011-08-01 16:59 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926
--- Comment #4 from irar at gcc dot gnu.org 2011-08-01 16:58:24 UTC ---
Author: irar
Date: Mon Aug 1 16:58:20 2011
New Revision: 177063
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=177063
Log:
PR tree-optimization/49926
* tree-vect-loop.c (vect_is_slp_reduction): Check that a
statement in a chain doesn't have uses both inside and
outside the loop.
Added:
trunk/gcc/testsuite/gcc.dg/vect/pr49926.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-loop.c
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/49926] [4.7 Regression] ice in process_use, at tree-vect-stmts.c:405
2011-07-31 21:37 [Bug c/49926] New: ice in process_use, at tree-vect-stmts.c:405 regehr at cs dot utah.edu
` (4 preceding siblings ...)
2011-08-01 16:59 ` irar at gcc dot gnu.org
@ 2011-08-02 7:01 ` irar at il dot ibm.com
5 siblings, 0 replies; 7+ messages in thread
From: irar at il dot ibm.com @ 2011-08-02 7:01 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926
Ira Rosen <irar at il dot ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #5 from Ira Rosen <irar at il dot ibm.com> 2011-08-02 07:01:05 UTC ---
Fixed.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2011-07-31 21:37 [Bug c/49926] New: ice in process_use, at tree-vect-stmts.c:405 regehr at cs dot utah.edu
2011-07-31 22:34 ` [Bug tree-optimization/49926] [4.7 Regression] " jakub at gcc dot gnu.org
2011-07-31 22:52 ` jakub at gcc dot gnu.org
2011-08-01 6:17 ` irar at il dot ibm.com
2011-08-01 15:15 ` irar at il dot ibm.com
2011-08-01 16:59 ` irar at gcc dot gnu.org
2011-08-02 7:01 ` irar at il dot ibm.com
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