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authorJim Kukunas <james.t.kukunas@linux.intel.com>2012-05-22 13:54:04 +1000
committerNeilBrown <neilb@suse.de>2012-05-22 13:54:04 +1000
commitea4d26ae24e58fbd2c61de9242adab053cb982d8 (patch)
tree3115dd168f0cf1eb1eb5dd6aecc385cfa0e8bc05 /arch/x86/Makefile
parent56a519913eeba2bdae4d7ee39e80fab442c3836c (diff)
raid5: add AVX optimized RAID5 checksumming
Optimize RAID5 xor checksumming by taking advantage of 256-bit YMM registers introduced in AVX. Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'arch/x86/Makefile')
-rw-r--r--arch/x86/Makefile5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 41a7237606a3..7a1cc9ee5c8a 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -115,9 +115,10 @@ cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTI
# does binutils support specific instructions?
asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
+avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
-KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
-KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
+KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
+KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
LDFLAGS := -m elf_$(UTS_MACHINE)