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[FFmpeg-devel,v2] libavutil/ppc: Make use of getauxval() and elf_aux_info() on ppc

Message ID ZuUJitr29k255Oey@humpty.home.comstyle.com
State New
Headers show
Series [FFmpeg-devel,v2] libavutil/ppc: Make use of getauxval() and elf_aux_info() on ppc | expand

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Commit Message

Brad Smith Sept. 14, 2024, 3:56 a.m. UTC 
Subject: [PATCH] libavutil/ppc: Make use of getauxval() and elf_aux_info() on ppc

Modern Linux has getauxval() and FreeBSD/OpenBSD ppc have elf_aux_info().

Signed-off-by: Brad Smith <brad@comstyle.com>
---
adjust to build with older glibc.

 libavutil/ppc/cpu.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
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Patch

diff --git a/libavutil/ppc/cpu.c b/libavutil/ppc/cpu.c
index 2b13cda662..5dd23013fb 100644
--- a/libavutil/ppc/cpu.c
+++ b/libavutil/ppc/cpu.c
@@ -20,6 +20,8 @@ 
 
 #ifdef __APPLE__
 #include <sys/sysctl.h>
+#elif HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
+#include <sys/auxv.h>
 #elif defined(__linux__)
 #include <asm/cputable.h>
 #include <linux/auxvec.h>
@@ -56,6 +58,26 @@  int ff_get_cpu_flags_ppc(void)
     if (result == VECTORTYPE_ALTIVEC)
         return AV_CPU_FLAG_ALTIVEC;
     return 0;
+#elif HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
+    int flags = 0;
+
+    unsigned long hwcap = ff_getauxval(AT_HWCAP);
+#ifdef PPC_FEATURE2_ARCH_2_07
+    unsigned long hwcap2 = ff_getauxval(AT_HWCAP2);
+#endif
+
+    if (hwcap & PPC_FEATURE_HAS_ALTIVEC)
+       flags |= AV_CPU_FLAG_ALTIVEC;
+#ifdef PPC_FEATURE_HAS_VSX
+    if (hwcap & PPC_FEATURE_HAS_VSX)
+       flags |= AV_CPU_FLAG_VSX;
+#endif
+#ifdef PPC_FEATURE2_ARCH_2_07
+    if (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+       flags |= AV_CPU_FLAG_POWER8;
+#endif
+
+    return flags;
 #elif defined(__APPLE__) || defined(__NetBSD__) || defined(__OpenBSD__)
 #if defined(__NetBSD__) || defined(__OpenBSD__)
     int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};