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Description: Check whether Power CPU supports Altivec
This patch adds a run-time check for the Altivec extension by
querying the CPU features using getauxval(AT_HWCAP), which is
available since glibc 2.16.
Author: Peter Colberg <peter@colberg.org>
Forwarded: not-needed
Last-Update: 2015-11-08
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
--- a/dSFMT.c
+++ b/dSFMT.c
@@ -21,7 +21,9 @@
#include "dSFMT-params.h"
#include "dSFMT-common.h"
-#if defined(HAVE_SSE2) && defined(__i386__)
+#if defined(HAVE_ALTIVEC)
+# include <sys/auxv.h>
+#elif defined(HAVE_SSE2) && defined(__i386__)
# include <cpuid.h>
#endif
@@ -521,7 +523,12 @@ void dsfmt_fill_array_open_open(dsfmt_t
gen_rand_array_o0o1(dsfmt, (w128_t *)array, size / 2);
}
-#if defined(HAVE_SSE2) && defined(__i386__)
+#if defined(HAVE_ALTIVEC)
+static int check_altivec() {
+ unsigned long aux = getauxval(AT_HWCAP);
+ return aux & PPC_FEATURE_HAS_ALTIVEC ? 1 : 0;
+}
+#elif defined(HAVE_SSE2) && defined(__i386__)
static int check_sse2() {
unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
__get_cpuid(1, &eax, &ebx, &ecx, &edx);
@@ -548,7 +555,12 @@ void dsfmt_chk_init_gen_rand(dsfmt_t *ds
fprintf(stderr, "DSFMT_MEXP doesn't match with dSFMT.c\n");
exit(1);
}
-#if defined(HAVE_SSE2) && defined(__i386__)
+#if defined(HAVE_ALTIVEC)
+ if (!check_altivec()) {
+ fprintf(stderr, "dSFMT requires a processor with Altivec support\n");
+ exit(1);
+ }
+#elif defined(HAVE_SSE2) && defined(__i386__)
if (!check_sse2()) {
fprintf(stderr, "dSFMT requires a processor with SSE2 support\n");
exit(1);
@@ -587,7 +599,12 @@ void dsfmt_chk_init_by_array(dsfmt_t *ds
fprintf(stderr, "DSFMT_MEXP doesn't match with dSFMT.c\n");
exit(1);
}
-#if defined(HAVE_SSE2) && defined(__i386__)
+#if defined(HAVE_ALTIVEC)
+ if (!check_altivec()) {
+ fprintf(stderr, "dSFMT requires a processor with Altivec support\n");
+ exit(1);
+ }
+#elif defined(HAVE_SSE2) && defined(__i386__)
if (!check_sse2()) {
fprintf(stderr, "dSFMT requires a processor with SSE2 support\n");
exit(1);
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