Hi,
PR70957 reports that the two subject tests fail on an older P7 machine. These
tests rely on
built-ins that exploit POWER9 vector support. It turns out that the failure
occurs because the
configured assembler is downlevel, and does not support even POWER8
instructions. This
causes TARGET_P8_VECTOR to be set to false, which in turn causes
TARGET_P9_VECTOR
to be set to false, so the built-ins in question are not linked into the
overloaded built-in table.
The only way I know to make the test predictable is to use a run-time test to
check whether
P9 vector instructions will execute. Thus this solution. I’ve verified we no
longer have test
failures on machines with a downlevel assembler, and the tests run correctly on
machines
with an up-to-date assembler. Is this ok for trunk and 6.2?
Thanks,
Bill
[2016-06-02] Bill Schmidt <wschm...@linux.vnet.ibm.com>
PR target/70957
* gcc.target/powerpc/vsx-elemrev-2.c: Require p9vector hardware
support.
* gcc.target/powerpc/vsx-elemrev-4.c: Likewise.
Index: gcc/testsuite/gcc.target/powerpc/vsx-elemrev-2.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/vsx-elemrev-2.c (revision 237044)
+++ gcc/testsuite/gcc.target/powerpc/vsx-elemrev-2.c (working copy)
@@ -1,6 +1,7 @@
/* { dg-do compile { target { powerpc64le*-*-* } } } */
/* { dg-skip-if "do not override mcpu" { powerpc*-*-* } { "-mcpu=*" } {
"-mcpu=power9" } } */
/* { dg-options "-mcpu=power9 -O0" } */
+/* { dg-require-effective-target p9vector_hw } */
/* { dg-final { scan-assembler-times "lxvd2x" 6 } } */
/* { dg-final { scan-assembler-times "lxvw4x" 6 } } */
/* { dg-final { scan-assembler-times "lxvh8x" 4 } } */
Index: gcc/testsuite/gcc.target/powerpc/vsx-elemrev-4.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/vsx-elemrev-4.c (revision 237044)
+++ gcc/testsuite/gcc.target/powerpc/vsx-elemrev-4.c (working copy)
@@ -1,6 +1,7 @@
/* { dg-do compile { target { powerpc64-*-* } } } */
/* { dg-skip-if "do not override mcpu" { powerpc*-*-* } { "-mcpu=*" } {
"-mcpu=power9" } } */
/* { dg-options "-mcpu=power9 -O0" } */
+/* { dg-require-effective-target p9vector_hw } */
/* { dg-final { scan-assembler-times "lxvx" 40 } } */
/* { dg-final { scan-assembler-times "stxvx" 40 } } */
