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Re: [PATCH,i386] cpuid function for prefetchw
On Mon, Aug 13, 2012 at 2:10 PM, Jakub Jelinek <firstname.lastname@example.org> wrote:
>> > To get the prefetchw cpuid flag, cpuid
>> > function 0x80000001 needs to be called.
>> > Previous to patch, function 0x7 is called.
>> > Bootstrapping and "make -k check" passes without failures.
>> > Ok for trunk?
>> IMHO you move it to a wrong spot, ecx bits of CPUID 0x80000001 are tested
>> So I think you want this instead (bootstrap/regtest in progress):
>> 2012-08-13 Ganesh Gopalasubramanian <Ganesh.Gopalasubramanian@amd.com>
>> Jakub Jelinek <email@example.com>
>> PR driver/54210
>> * config/i386/driver-i386.c (host_detect_local_cpu): Test bit_PRFCHW
>> bit of CPUID 0x80000001 %ecx instead of CPUID 7 %ecx.
>> * config/i386/cpuid.h (bits_PRFCHW): Move definition to CPUID
>> 0x80000001 %ecx flags.
> Now bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
OK, but I didn't find PRFCHW in the cpuid documentation to confirm the change.