* [Bug tree-optimization/61938] Vectorization not happening .
[not found] <bug-61938-4@http.gcc.gnu.org/bugzilla/>
@ 2014-07-29 18:31 ` harmeeksingh at gmail dot com
2014-07-29 18:56 ` glisse at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: harmeeksingh at gmail dot com @ 2014-07-29 18:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61938
--- Comment #3 from harmeeksingh at gmail dot com ---
#include <stdio.h>
#define VEC 1024
typedef long int int64;
typedef int int32;
void foo (int arraysize,
int *__restrict result,
int *__restrict selectvector,
int selectelements,
int64 *__restrict array,
int64 compval)
{
int k, i;
for (k =0,i=0; i < arraysize; ++i) {
result[k] = i; k += (array[i] == compval);
}
}
main()
{
int result[VEC];
int selectvector[VEC];
int selectelements;
int64 array[VEC];
int k, i;
foo(VEC, result, selectvector, VEC, array, 1);
}
Even the above does not vectorize
gcc -fPIC -shared -DCLS=64 -ffast-math -mfpmath=sse -mmmx -msse -msse2
-ftree-vectorize -ftree-vectorizer-verbose=7 -O3 -march=native /tmp/x.c -o
/tmp/x
Analyzing loop at /tmp/x.c:17
17: not vectorized: data ref analysis failed *D.2502_9 = i_27;
/tmp/x.c:9: note: vectorized 0 loops in function.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/61938] Vectorization not happening .
[not found] <bug-61938-4@http.gcc.gnu.org/bugzilla/>
2014-07-29 18:31 ` [Bug tree-optimization/61938] Vectorization not happening harmeeksingh at gmail dot com
@ 2014-07-29 18:56 ` glisse at gcc dot gnu.org
2014-07-30 9:56 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: glisse at gcc dot gnu.org @ 2014-07-29 18:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61938
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
Please show what you would like the code to look like after vectorization.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/61938] Vectorization not happening .
[not found] <bug-61938-4@http.gcc.gnu.org/bugzilla/>
2014-07-29 18:31 ` [Bug tree-optimization/61938] Vectorization not happening harmeeksingh at gmail dot com
2014-07-29 18:56 ` glisse at gcc dot gnu.org
@ 2014-07-30 9:56 ` rguenth at gcc dot gnu.org
2014-07-30 22:25 ` harmeeksingh at gmail dot com
` (2 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-07-30 9:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61938
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
The test from comment #3 has exactly the same issue - the store to result[k]
cannot be vectorized in any meaningful way.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/61938] Vectorization not happening .
[not found] <bug-61938-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2014-07-30 9:56 ` rguenth at gcc dot gnu.org
@ 2014-07-30 22:25 ` harmeeksingh at gmail dot com
2014-07-31 10:23 ` rguenth at gcc dot gnu.org
2015-10-20 9:27 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: harmeeksingh at gmail dot com @ 2014-07-30 22:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61938
--- Comment #6 from harmeeksingh at gmail dot com ---
Equivalent code when written by hand where tmp is a intermediate array . The
compiler
vectorizes both loops.
int k, i;
/* vectorize the compares */
for (i=0; i < arraysize; ++i) {
tmp[i] = (array[i] == compval);
}
/* another loop now set the result array */
for (k=0, i=0; i < arraysize; ++i) {
if (tmp[i])
{
result[k] = i;
k++;
}
}
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/61938] Vectorization not happening .
[not found] <bug-61938-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2014-07-30 22:25 ` harmeeksingh at gmail dot com
@ 2014-07-31 10:23 ` rguenth at gcc dot gnu.org
2015-10-20 9:27 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-07-31 10:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61938
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to harmeeksingh from comment #6)
>
> Equivalent code when written by hand where tmp is a intermediate array . The
> compiler
> vectorizes both loops.
>
> int k, i;
> /* vectorize the compares */
> for (i=0; i < arraysize; ++i) {
> tmp[i] = (array[i] == compval);
> }
>
> /* another loop now set the result array */
> for (k=0, i=0; i < arraysize; ++i) {
> if (tmp[i])
> {
> result[k] = i;
> k++;
> }
> }
I only see the first loop vectorized.
typedef long int int64;
typedef int int32;
void foo (int arraysize,
int *__restrict result,
int *__restrict tmp,
int *__restrict selectvector,
int selectelements,
int64 *__restrict array,
int64 compval)
{
int k, i;
/* another loop now set the result array */
for (k=0, i=0; i < arraysize; ++i) {
if (tmp[i])
{
result[k] = i;
k++;
}
}
}
cannot be vectorized exactly because of the said reasons.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/61938] Vectorization not happening .
[not found] <bug-61938-4@http.gcc.gnu.org/bugzilla/>
` (4 preceding siblings ...)
2014-07-31 10:23 ` rguenth at gcc dot gnu.org
@ 2015-10-20 9:27 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-10-20 9:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61938
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Nothing to do here.
^ permalink raw reply [flat|nested] 6+ messages in thread