Re: [4.7][google]Support for getting CPU type and feature information at run-time. (issue4893046)

[Sriraman Tallam <tmsriram at google dot com>]

On Tue, Aug 16, 2011 at 2:06 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Tue, Aug 16, 2011 at 1:50 PM, Sriraman Tallam <tmsriram@google.com> wrote:
>> Support for getting CPU type and feature information at run-time.
>>
>> The following patch provides support for finding the platform type at run-time, like cpu type and features supported. The multi-versioning framework will use the builtins added to dispatch the right function version. Please refer to http://gcc.gnu.org/ml/gcc/2011-08/msg00298.html for details on function multi-versioning usability.
>>
>> ? ? ? ?* tree-pass.h (pass_tree_fold_builtin_target): New pass.
>> ? ? ? ?* builtins.def (BUILT_IN_TARGET_SUPPORTS_CMOV): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_SUPPORTS_MMX): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_SUPPORTS_POPCOUNT): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_SUPPORTS_SSE): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_SUPPORTS_SSE2): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_SUPPORTS_SSE3): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_SUPPORTS_SSSE3): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_SUPPORTS_SSE4_1): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_SUPPORTS_SSE4_2): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_IS_AMD): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_IS_INTEL): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_IS_COREI7_NEHALEM): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_IS_COREI7_WESTMERE): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_IS_COREI7_SANDYBRIDGE): New builtin.
>
> Can you add Intel Atom?

Yes, I will. There is probably a lot more that is interesting which I
missed and will add if somebody sees fit.

>
>> ? ? ? ?(BUILT_IN_TARGET_IS_AMDFAM10_BARCELONA): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_IS_AMDFAM10_SHANGHAI): New builtin.
>> ? ? ? ?(BUILT_IN_TARGET_IS_AMDFAM10_ISTANBUL): New builtin.
>> ? ? ? ?* mversn-dispatch.c (do_fold_builtin_target): New function.
>> ? ? ? ?(gate_fold_builtin_target): New function.
>> ? ? ? ?(pass_tree_fold_builtin_target): New pass.
>> ? ? ? ?* timevar.def (TV_FOLD_BUILTIN_TARGET): New var.
>> ? ? ? ?* passes.c (init_optimization_passes): Add new pass to pass list.
>> ? ? ? ?* config/i386/i386.c (build_struct_with_one_bit_fields): New function.
>> ? ? ? ?(make_var_decl): New function.
>> ? ? ? ?(get_field_from_struct): New function.
>> ? ? ? ?(make_constructor_to_get_target_type): New function.
>> ? ? ? ?(fold_builtin_target): New function.
>> ? ? ? ?(ix86_fold_builtin): New function.
>> ? ? ? ?(TARGET_FOLD_BUILTIN): New macro.
>>
>> ? ? ? ?* gcc.dg/builtin_target.c: New test.
>>
>> ? ? ? ?* config/i386/i386-cpuinfo.c: New file.
>> ? ? ? ?* config/i386/t-cpuinfo: New file.
>> ? ? ? ?* config.host: Add t-cpuinfo to link i386-cpuinfo.o with libgcc
>>
>
>> +static void
>> +get_intel_cpu (unsigned int family, unsigned int model, unsigned int brand_id)
>> +{
>> + ?/* Parse family and model only if brand ID is 0. */
>> + ?if (brand_id == 0)
>> + ? ?{
>> + ? ? ?switch (family)
>> + ? ? ? {
>> + ? ? ? case 0x5:
>> + ? ? ? ? __cpu_type = PROCESSOR_PENTIUM;
>> + ? ? ? ? break;
>> + ? ? ? case 0x6:
>> + ? ? ? ? switch (model)
>> + ? ? ? ? ? {
>> + ? ? ? ? ? case 0x1a:
>> + ? ? ? ? ? case 0x1e:
>> + ? ? ? ? ? case 0x1f:
>> + ? ? ? ? ? case 0x2e:
>> + ? ? ? ? ? ? /* Nehalem. ?*/
>> + ? ? ? ? ? ? __cpu_type = PROCESSOR_COREI7_NEHALEM;
>> + ? ? ? ? ? ? __cpu_model.__cpu_is_corei7_nehalem = 1;
>> + ? ? ? ? ? ? break;
>> + ? ? ? ? ? case 0x25:
>> + ? ? ? ? ? case 0x2c:
>> + ? ? ? ? ? case 0x2f:
>> + ? ? ? ? ? ? /* Westmere. ?*/
>> + ? ? ? ? ? ? __cpu_type = PROCESSOR_COREI7_WESTMERE;
>> + ? ? ? ? ? ? __cpu_model.__cpu_is_corei7_westmere = 1;
>> + ? ? ? ? ? ? break;
>> + ? ? ? ? ? case 0x2a:
>> + ? ? ? ? ? ? /* Sandy Bridge. ?*/
>> + ? ? ? ? ? ? __cpu_type = PROCESSOR_COREI7_SANDYBRIDGE;
>> + ? ? ? ? ? ? __cpu_model.__cpu_is_corei7_sandybridge = 1;
>> + ? ? ? ? ? ? break;
>> + ? ? ? ? ? case 0x17:
>> + ? ? ? ? ? case 0x1d:
>> + ? ? ? ? ? ? /* Penryn. ?*/
>> + ? ? ? ? ? case 0x0f:
>> + ? ? ? ? ? ? /* Merom. ?*/
>> + ? ? ? ? ? ? __cpu_type = PROCESSOR_CORE2;
>> + ? ? ? ? ? ? break;
>> + ? ? ? ? ? default:
>> + ? ? ? ? ? ? __cpu_type = PROCESSOR_INTEL_GENERIC;
>> + ? ? ? ? ? ? break;
>> + ? ? ? ? ? }
>> + ? ? ? ? break;
>> + ? ? ? default:
>> + ? ? ? ? /* We have no idea. ?*/
>> + ? ? ? ? __cpu_type = PROCESSOR_INTEL_GENERIC;
>> + ? ? ? ? break;
>> + ? ? ? }
>> + ? ?}
>> +}
>> +
>
> Please see config/i386/driver-i386.c for Intel CPU detection.
> I will try to make it up to date. ?For example, I added
> model 0x2d, 0x1c, 0x26,

I used the code in config/i386/driver-i386.c was used as reference.

Thanks,
-Sri.

>
> Thanks.
>
> --
> H.J.
>