On Tue, Aug 16, 2011 at 1:50 PM, Sriraman Tallam <[email protected]> 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?
> (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,
Thanks.
--
H.J.
