>>> On 21.02.14 at 13:51, "H. Peter Anvin" <h...@zytor.com> wrote:
> How old?
2.16.91.0.5 (SLE10)
Jan
> On February 21, 2014 2:32:50 AM PST, Jan Beulich <jbeul...@suse.com> wrote:
>>Just like for other ISA extension instruction uses we should check
>>whether the assembler actually supports them. The fallback here simply
>>is to encode an instruction with fixed operands (%eax and %ecx).
>>
>>Signed-off-by: Jan Beulich <jbeul...@suse.com>
>>Cc: Francesco Fusco <ffu...@redhat.com>
>>Cc: Daniel Borkmann <dbork...@redhat.com>
>>Cc: Thomas Graf <tg...@redhat.com>
>>Cc: David S. Miller <da...@davemloft.net>
>>---
>> arch/x86/Makefile | 1 +
>> arch/x86/lib/hash.c | 4 ++++
>> 2 files changed, 5 insertions(+)
>>
>>--- 3.14-rc3-x86-hash-crc32.orig/arch/x86/Makefile
>>+++ 3.14-rc3-x86-hash-crc32/arch/x86/Makefile
>>@@ -152,6 +152,7 @@ cfi-sections := $(call as-instr,.cfi_sec
>>
>> # does binutils support specific instructions?
>> asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
>>+asinstr += $(call as-instr,crc32l
>>%eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
>>avx_instr := $(call as-instr,vxorps
>>%ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
>>avx2_instr :=$(call as-instr,vpbroadcastb
>>%xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
>>
>>--- 3.14-rc3-x86-hash-crc32.orig/arch/x86/lib/hash.c
>>+++ 3.14-rc3-x86-hash-crc32/arch/x86/lib/hash.c
>>@@ -39,7 +39,11 @@
>>
>> static inline u32 crc32_u32(u32 crc, u32 val)
>> {
>>+#ifdef CONFIG_AS_CRC32
>> asm ("crc32l %1,%0\n" : "+r" (crc) : "rm" (val));
>>+#else
>>+ asm (".byte 0xf2, 0x0f, 0x38, 0xf1, 0xc1" : "+a" (crc) : "c" (val));
>>+#endif
>> return crc;
>> }
>>
>
> --
> Sent from my mobile phone. Please pardon brevity and lack of formatting.
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