[FFmpeg-devel] [PATCH] WIP AVX support

[Jason Garrett-Glaser]

Need someone who does configure/etc stuff to finish this.
---
 configure           |    2 ++
 libavutil/cpu.h     |    1 +
 libavutil/x86/cpu.c |   15 +++++++++++++++
 3 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 46f4e44..c6ceaa8 100755
--- a/configure
+++ b/configure
@@ -223,6 +223,7 @@ Advanced options (experts only):
   --disable-mmx2           disable MMX2 optimizations
   --disable-sse            disable SSE optimizations
   --disable-ssse3          disable SSSE3 optimizations
+  --disable-avx            disable AVX optimizations
   --disable-armv5te        disable armv5te optimizations
   --disable-armv6          disable armv6 optimizations
   --disable-armv6t2        disable armv6t2 optimizations
@@ -1181,6 +1182,7 @@ mmx_deps="x86"
 mmx2_deps="mmx"
 sse_deps="mmx"
 ssse3_deps="sse"
+avx_deps="ssse3"
 
 aligned_stack_if_any="ppc x86"
 fast_64bit_if_any="alpha ia64 mips64 parisc64 ppc64 sparc64 x86_64"
diff --git a/libavutil/cpu.h b/libavutil/cpu.h
index 71cc265..2ddde26 100644
--- a/libavutil/cpu.h
+++ b/libavutil/cpu.h
@@ -36,6 +36,7 @@
 #define AV_CPU_FLAG_SSSE3        0x0080 ///< Conroe SSSE3 functions
 #define AV_CPU_FLAG_SSE4         0x0100 ///< Penryn SSE4.1 functions
 #define AV_CPU_FLAG_SSE42        0x0200 ///< Nehalem SSE4.2 functions
+#define AV_CPU_FLAG_AVX          0x0400 ///< Sandy Bridge AVX functions
 #define AV_CPU_FLAG_IWMMXT       0x0100 ///< XScale IWMMXT
 #define AV_CPU_FLAG_ALTIVEC      0x0001 ///< standard
 
diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c
index 4b6cb0d..a34e18f 100644
--- a/libavutil/x86/cpu.c
+++ b/libavutil/x86/cpu.c
@@ -35,6 +35,12 @@
            "=c" (ecx), "=d" (edx)\
          : "0" (index));
 
+#define xgetbv(index,eax,ebx,ecx,edx)\
+    __asm__ volatile\
+        ("xgetbv\n\t"\
+         : "=a" (eax), (edx)\
+         : "c" (index));
+
 /* Function to test if multimedia instructions are supported...  */
 int ff_get_cpu_flags_x86(void)
 {
@@ -95,6 +101,15 @@ int ff_get_cpu_flags_x86(void)
             rval |= AV_CPU_FLAG_SSE42;
 #endif
                   ;
+#if HAVE_AVX
+        /* Check OXSAVE and AVX bits */
+        if ((ecx&0x18000000) == 0x18000000) {
+            /* Check for OS support */
+            xgetbv(0, eax, edx);
+            if ((eax&0x6) == 0x6)
+                cpu |= AV_CPU_FLAG_AVX;
+        }
+#endif
     }
 
     cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
-- 
1.7.3.2.451.g1c2ab.dirty