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* [Bug tree-optimization/46012] New: 256bit vectorizer failed on int->double
@ 2010-10-14 8:54 hjl.tools at gmail dot com
2010-10-14 9:02 ` [Bug tree-optimization/46012] " rguenth at gcc dot gnu.org
2012-07-13 8:47 ` rguenth at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: hjl.tools at gmail dot com @ 2010-10-14 8:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46012
Summary: 256bit vectorizer failed on int->double
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: hjl.tools@gmail.com
CC: rguenth@gcc.gnu.org
For
---
double a[1024];
float b[1024];
int c[1024];
void dependence_distance_4_mixed_0 (void)
{
int i;
for (i = 0; i < 1020; ++i)
a[i + 4] = a[i] + a[i + 4] + c[i];
}
---
with -O3 -ffast-math -mavx, vect256 branch generates:
.L2:
vmovapd a(%rax,%rax), %ymm0
vcvtdq2pd c(%rax), %ymm1
vaddpd a+32(%rax,%rax), %ymm0, %ymm0
vaddpd %ymm1, %ymm0, %ymm0
vmovapd %ymm0, a+32(%rax,%rax)
addq $16, %rax
cmpq $4080, %rax
jne .L2
Trunk at revision 165455 generates
.L2:
vmovapd 16(%rax), %xmm2
vaddpd -16(%rax), %xmm2, %xmm2
vmovdqa (%rdx), %xmm0
addq $16, %rdx
vpshufd $238, %xmm0, %xmm1
vcvtdq2pd %xmm0, %xmm0
vcvtdq2pd %xmm1, %xmm1
vaddpd %xmm1, %xmm2, %xmm1
vmovapd (%rax), %xmm2
vaddpd -32(%rax), %xmm2, %xmm2
vmovapd %xmm1, 16(%rax)
vaddpd %xmm0, %xmm2, %xmm0
vmovapd %xmm0, (%rax)
addq $32, %rax
cmpq %rax, %rcx
jne .L2
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/46012] 256bit vectorizer failed on int->double
2010-10-14 8:54 [Bug tree-optimization/46012] New: 256bit vectorizer failed on int->double hjl.tools at gmail dot com
@ 2010-10-14 9:02 ` rguenth at gcc dot gnu.org
2012-07-13 8:47 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2010-10-14 9:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46012
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2010.10.14 09:01:56
Ever Confirmed|0 |1
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-14 09:01:56 UTC ---
Related to PR46011
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/46012] 256bit vectorizer failed on int->double
2010-10-14 8:54 [Bug tree-optimization/46012] New: 256bit vectorizer failed on int->double hjl.tools at gmail dot com
2010-10-14 9:02 ` [Bug tree-optimization/46012] " rguenth at gcc dot gnu.org
@ 2012-07-13 8:47 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-07-13 8:47 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46012
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |53947
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-13 08:47:11 UTC ---
Link to vectorizer missed-optimization meta-bug.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2010-10-14 8:54 [Bug tree-optimization/46012] New: 256bit vectorizer failed on int->double hjl.tools at gmail dot com
2010-10-14 9:02 ` [Bug tree-optimization/46012] " rguenth at gcc dot gnu.org
2012-07-13 8:47 ` rguenth at gcc dot gnu.org
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