| Message ID | 1456764577.8013.8.camel@oc8801110288.ibm.com |
|---|---|
| State | New |
| Headers | show |
On Mon, Feb 29, 2016 at 11:49 AM, Bill Schmidt <wschmidt@linux.vnet.ibm.com> wrote: > Hi, > > PR70011 identifies an old vectorization test that recently started > failing on GCC 6 with POWER8 hardware. This "failure" is that we now > find vectorization of the test case to be profitable, where it didn't > used to be. A combination of two factors allowed this to become > profitable here: First, the POWER8 feature that unaligned vector > accesses are supported by hardware; and second, some improvement in the > vectorizer itself (vect_recog_mult_pattern now kicks in). > > The proposed fix herein is to XFAIL the test for vectorization failure > for POWER subtargets that support efficient unaligned vector accesses. > Since this also requires the vectorization improvement that only occurs > in GCC 6, it makes sense to only make this change on trunk. > > I've verified the modified test on powerpc64le-unknown-linux-gnu > (POWER8) and on powerpc64-unknown-linux-gnu (both POWER7 and POWER8) and > everything works as expected. Is this ok for trunk? > > Thanks, > Bill > > > 2016-02-29 Bill Schmidt <wschmidt@linux.vnet.ibm.com> > > PR target/70011 > * gcc.dg/vect/costmodel/ppc/costmodel-fast-math-vect-pr299925.c: > XFAIL when hardware supports efficient unaligned storage access. Okay. Thanks, David
Index: gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-fast-math-vect-pr29925.c =================================================================== --- gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-fast-math-vect-pr29925.c (revision 233813) +++ gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-fast-math-vect-pr29925.c (working copy) @@ -35,5 +35,5 @@ int main() return 0; } -/* { dg-final { scan-tree-dump-times "vectorization not profitable" 1 "vect" } } */ +/* { dg-final { scan-tree-dump-times "vectorization not profitable" 1 "vect" { xfail { vect_hw_misalign } } } } */