adjust vectorization expectations for ppc costmodel 76b

[Alexandre Oliva <oliva@adacore.com>]

This test expects vectorization at power8+ because strict alignment is
not required for vectors.  For power7, vectorization is not to take
place because it's not deemed profitable: 12 iterations would be
required to make it so.

But for power6 and below, the test's 10 iterations are enough to make
vectorization profitable, but the test doesn't expect this.  Assuming
the decision is indeed appropriate, I'm adjusting the expectations.

This was regstrapped on x86_64-linux-gnu, tested with a cross to a
ppc64-vxworks7r2, and I'm now also regstrapping on ppc64-linux-gnu just
to be sure.  Ok to install?


for  gcc/testsuite/ChangeLog

	* gcc.dg/vect/costmodel/ppc/costmodel-vect-76b.c: Adjust
	expectations for cpus below power7.
---
 .../gcc.dg/vect/costmodel/ppc/costmodel-vect-76b.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-vect-76b.c b/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-vect-76b.c
index 5da4343198c10..937985012286c 100644
--- a/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-vect-76b.c
+++ b/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-vect-76b.c
@@ -45,9 +45,10 @@ int main (void)
   return 0;
 }
 
-/* Peeling to align the store is used. Overhead of peeling is too high.  */
-/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 0 "vect" { target { vector_alignment_reachable && {! vect_no_align} } } } } */
-/* { dg-final { scan-tree-dump-times "vectorization not profitable" 1 "vect" { target { vector_alignment_reachable && {! vect_hw_misalign} } } } } */
+/* Peeling to align the store is used. Overhead of peeling is too high
+   for power7, but acceptable for earlier architectures.  */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 0 "vect" { target { has_arch_pwr7 && { vector_alignment_reachable && {! vect_no_align} } } } } } */
+/* { dg-final { scan-tree-dump-times "vectorization not profitable" 1 "vect" { target { has_arch_pwr7 && { vector_alignment_reachable && {! vect_hw_misalign} } } } } } */
 
 /* Versioning to align the store is used. Overhead of versioning is not too high.  */
-/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target { vect_no_align || {! vector_alignment_reachable} } } } } */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target { vect_no_align || { {! vector_alignment_reachable} || {! has_arch_pwr7 } } } } } } */

-- 
Alexandre Oliva, happy hacker  https://FSFLA.org/blogs/lxo/
   Free Software Activist         GNU Toolchain Engineer
        Vim, Vi, Voltei pro Emacs -- GNUlius Caesar