diff options
| author | Jim Kukunas <james.t.kukunas@linux.intel.com> | 2012-11-08 13:47:44 -0800 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-12-13 16:42:01 +1100 |
| commit | 7056741fd9fc14a65608549a4657cf5178f05f63 (patch) | |
| tree | b30504208f8261c4a0a2625169eaff9aa9de544e /lib/raid6/x86.h | |
| parent | 54f89341e8b8da0cdac8a7b873491739de19f098 (diff) | |
| download | op-kernel-dev-7056741fd9fc14a65608549a4657cf5178f05f63.zip op-kernel-dev-7056741fd9fc14a65608549a4657cf5178f05f63.tar.gz | |
lib/raid6: Add AVX2 optimized recovery functions
Optimize RAID6 recovery functions to take advantage of
the 256-bit YMM integer instructions introduced in AVX2.
The patch was tested and benchmarked before submission.
However hardware is not yet released so benchmark numbers
cannot be reported.
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'lib/raid6/x86.h')
| -rw-r--r-- | lib/raid6/x86.h | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/lib/raid6/x86.h b/lib/raid6/x86.h index d55d632..b759548 100644 --- a/lib/raid6/x86.h +++ b/lib/raid6/x86.h @@ -45,19 +45,23 @@ static inline void kernel_fpu_end(void) #define X86_FEATURE_XMM3 (4*32+ 0) /* "pni" SSE-3 */ #define X86_FEATURE_SSSE3 (4*32+ 9) /* Supplemental SSE-3 */ #define X86_FEATURE_AVX (4*32+28) /* Advanced Vector Extensions */ +#define X86_FEATURE_AVX2 (9*32+ 5) /* AVX2 instructions */ #define X86_FEATURE_MMXEXT (1*32+22) /* AMD MMX extensions */ /* Should work well enough on modern CPUs for testing */ static inline int boot_cpu_has(int flag) { - u32 eax = (flag & 0x20) ? 0x80000001 : 1; - u32 ecx, edx; + u32 eax, ebx, ecx, edx; + + eax = (flag & 0x100) ? 7 : + (flag & 0x20) ? 0x80000001 : 1; + ecx = 0; asm volatile("cpuid" - : "+a" (eax), "=d" (edx), "=c" (ecx) - : : "ebx"); + : "+a" (eax), "=b" (ebx), "=d" (edx), "+c" (ecx)); - return ((flag & 0x80 ? ecx : edx) >> (flag & 31)) & 1; + return ((flag & 0x100 ? ebx : + (flag & 0x80) ? ecx : edx) >> (flag & 31)) & 1; } #endif /* ndef __KERNEL__ */ |
