Bill Seurer pointed out that building the BMI tests on a power8 but with
gcc built --with-cpu=power6 fails with link errors. The intrinsics
_pdep_u64/32 and _pext_u64/32 are guarded with #ifdef _ARCH_PWR7 as the
implementation uses bpermd and popcntd instructions introduced with
power7 (PowerISA-2.06).
But if the GCC is built --with-cpu=power6, the compiler is capable of
supporting -mcpu=power7 but will not generate bpermd/popcntd by default.
Then if some code them uses say _pext_u64 with -mcpu=power6 the
intrinsic is not not supported (needs power7) and so is not defined.
The { dg-require-effective-target powerpc_vsx_ok } is not sufficient for
the { dg-do run } and need to be changed to vsx_hw. Also we need add
-mcpu=power7 to dg-options to insure the compiler will generated the
bpermd/popcntd instructions.
This is sufficient for all the bmi/bmi2 tests to skip/pass for power6
and later.
[gcc/testsuite]
2017-05-26 Steven Munroe <munro...@gcc.gnu.org>
* gcc.target/powerpc/bmi2-pdep32-1.c []: Add -mcpu=power7 to
dg-options. Change dg-require-effective-target powerpc_vsx_ok
to vsx_hw.
* gcc.target/powerpc/bmi2-pdep64-1.c: Likewise.
* gcc.target/powerpc/bmi2-pext32-1.c: Likewise.
* gcc.target/powerpc/bmi2-pext64-1.c: Likewise.
* gcc.target/powerpc/bmi2-pext64-1a.c: Add -mcpu=power7 to
dg-options.
Index: gcc/testsuite/gcc.target/powerpc/bmi2-pdep32-1.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/bmi2-pdep32-1.c (revision 248468)
+++ gcc/testsuite/gcc.target/powerpc/bmi2-pdep32-1.c (working copy)
@@ -1,7 +1,7 @@
/* { dg-do run } */
-/* { dg-options "-O3" } */
+/* { dg-options "-O3 -mcpu=power7" } */
/* { dg-require-effective-target lp64 } */
-/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-require-effective-target vsx_hw } */
#define NO_WARN_X86_INTRINSICS 1
#include <x86intrin.h>
Index: gcc/testsuite/gcc.target/powerpc/bmi2-pdep64-1.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/bmi2-pdep64-1.c (revision 248468)
+++ gcc/testsuite/gcc.target/powerpc/bmi2-pdep64-1.c (working copy)
@@ -1,7 +1,7 @@
/* { dg-do run } */
-/* { dg-options "-O3" } */
+/* { dg-options "-O3 -mcpu=power7" } */
/* { dg-require-effective-target lp64 } */
-/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-require-effective-target vsx_hw } */
#define NO_WARN_X86_INTRINSICS 1
#include <x86intrin.h>
Index: gcc/testsuite/gcc.target/powerpc/bmi2-pext32-1.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/bmi2-pext32-1.c (revision 248468)
+++ gcc/testsuite/gcc.target/powerpc/bmi2-pext32-1.c (working copy)
@@ -1,7 +1,7 @@
/* { dg-do run } */
-/* { dg-options "-O3" } */
+/* { dg-options "-O3 -mcpu=power7" } */
/* { dg-require-effective-target lp64 } */
-/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-require-effective-target vsx_hw } */
#define NO_WARN_X86_INTRINSICS 1
#include <x86intrin.h>
Index: gcc/testsuite/gcc.target/powerpc/bmi2-pext64-1.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/bmi2-pext64-1.c (revision 248468)
+++ gcc/testsuite/gcc.target/powerpc/bmi2-pext64-1.c (working copy)
@@ -1,7 +1,7 @@
/* { dg-do run } */
-/* { dg-options "-O3" } */
+/* { dg-options "-O3 -mcpu=power7" } */
/* { dg-require-effective-target lp64 } */
-/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-require-effective-target vsx_hw } */
#define NO_WARN_X86_INTRINSICS 1
#include <x86intrin.h>
Index: gcc/testsuite/gcc.target/powerpc/bmi2-pext64-1a.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/bmi2-pext64-1a.c (revision 248468)
+++ gcc/testsuite/gcc.target/powerpc/bmi2-pext64-1a.c (working copy)
@@ -1,5 +1,5 @@
/* { dg-do compile } */
-/* { dg-options "-O3" } */
+/* { dg-options "-O3 -mcpu=power7" } */
/* { dg-require-effective-target lp64 } */
/* { dg-require-effective-target powerpc_vsx_ok } */
