Update comments

1 files changed, 15 insertions, 12 deletions

diff --git a/TestPrograms/test_ppc_power7.cxx b/TestPrograms/test_ppc_power7.cxx
index 52276700..103034ea 100644
--- a/TestPrograms/test_ppc_power7.cxx
+++ b/TestPrograms/test_ppc_power7.cxx
@@ -1,17 +1,20 @@
 #include <altivec.h>

 

-// This follows ppc_simd.h. XLC compilers for POWER7 use vec_xlw4 and vec_xstw4.

-// XLC compilers for POWER8 and above use vec_xl and vec_xst. The way to tell

-// the difference is, POWER7 XLC compilers are version 12.x and earlier.

-// The open question is, how to handle early Clang compilers for POWER7.

-// We know the latest Clang compilers support vec_xl and vec_xst.

+// This follows ppc_simd.h. XLC compilers for POWER7 use vec_xlw4 and

+// vec_xstw4. Some XLC compilers for POWER7 and above use vec_xl and

+// vec_xst. The way to tell the difference is, XLC compilers version

+// 13.0 and earlier use use vec_xlw4 and vec_xstw4 XLC compilers 13.1

+// and later are use vec_xl and vec_xst. The open question is, how to

+// handle early Clang compilers for POWER7. We know the latest Clang

+// compilers support vec_xl and vec_xst. Also see

+// https://www-01.ibm.com/support/docview.wss?uid=swg21683541

 

-#if defined(__xlc__) && (__xlc__ < 0x0d00)

-# define __old_xlc__ 1

+#if defined(__xlc__) && (__xlc__ < 0x0d01)

+# define __early_xlc__ 1

 #endif

 

-#if defined(__xlC__) && (__xlC__ < 0x0d00)

-# define __old_xlC__ 1

+#if defined(__xlC__) && (__xlC__ < 0x0d01)

+# define __early_xlC__ 1

 #endif

 

 int main(int argc, char* argv[])

@@ -19,15 +22,15 @@ int main(int argc, char* argv[])
 	__vector unsigned char x;

 	unsigned char res[16];

 

-#if defined(__old_xlc__) || defined(__old_xlC__)

+#if defined(_ARCH_PWR7) && (defined(__early_xlc__) || defined(__early_xlC__))

     x=vec_xlw4(0, (unsigned char*)argv[0]);

 	x=vec_add(x,x);

 	vec_xstw4(x, 0, res);

-#elif defined(__xlc__) || defined(__xlC__) || defined(__clang__)

+#elif defined(_ARCH_PWR7) && (defined(__xlc__) || defined(__xlC__) || defined(__clang__))

 	x=vec_xl(0, (unsigned char*)argv[0]);

 	x=vec_add(x,x);

 	vec_xst(x, 0, res);

-#elif defined(__GNUC__)

+#elif defined(_ARCH_PWR7) && defined(__GNUC__)

 	x=vec_vsx_ld(0, (unsigned char*)argv[0]);

 	x=vec_add(x,x);

 	vec_vsx_st(x, 0, res);