http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50435
Ira Rosen <irar at il dot ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |irar at il dot ibm.com
--- Comment #1 from Ira Rosen <irar at il dot ibm.com> 2011-09-16 15:18:11 UTC
---
(In reply to comment #0)
>
> indeed no "basic block vectorized using SLP". However compiling the test with
> -ftree-vectorizer-verbose=2 returns
>
> ...
> Vectorizing loop at /opt/gcc/work/gcc/testsuite/gcc.dg/vect/bb-slp-25.c:16
>
> 16: created 2 versioning for alias checks.
>
> 16: vectorizing stmts using SLP.
> 16: LOOP VECTORIZED.
> ...
I understand that the loop vectorization somehow worked, so could you please
try the following patch to avoid it:
Index: bb-slp-25.c
===================================================================
--- bb-slp-25.c (revision 178880)
+++ bb-slp-25.c (working copy)
@@ -9,7 +9,7 @@
short src[N], dst[N];
-void foo (short * __restrict dst, short * __restrict src, int h, int stride)
+void foo (short * __restrict dst, short * __restrict src, int h, int stride,
int dummy)
{
int i;
h /= 16;
@@ -25,6 +25,8 @@ void foo (short * __restrict dst, short
dst[7] += A*src[7] + src[7+stride];
dst += 8;
src += 8;
+ if (dummy == 32)
+ abort ();
}
}
@@ -41,7 +43,7 @@ int main (void)
src[i] = i;
}
- foo (dst, src, N, 8);
+ foo (dst, src, N, 8, 0);
for (i = 0; i < N/2; i++)
{
>
> I have applied r178880 on top of r178869 on powerpc-apple-darwin9 and the
> tests
> pass while I get the above results when I run them manually.
For PowerPC vect_element_align is false, while
/* { dg-final { scan-tree-dump-times "basic block vectorized using SLP" 1 "slp"
{ target vect_element_align } } } */
so we don't expect the basic block to get vectorized.
Thanks,
Ira
