Fangrui Song 27da15381c [X86] __builtin_cpu_supports: support x86-64{,-v2,-v3,-v4} ...

GCC 12 (https://gcc.gnu.org/PR101696) allows
__builtin_cpu_supports("x86-64") (and -v2 -v3 -v4).
This patch ports the feature.

* Add `FEATURE_X86_64_{BASELINE,V2,V3,V4}` to enum ProcessorFeatures,
  but keep CPU_FEATURE_MAX unchanged to make
  FeatureInfos/FeatureInfos_WithPLUS happy.
* Change validateCpuSupports to allow `x86-64{,-v2,-v3,-v4}`
* Change getCpuSupportsMask to return `std::array<uint32_t, 4>` where
  `x86-64{,-v2,-v3,-v4}` set bits `FEATURE_X86_64_{BASELINE,V2,V3,V4}`.
* `target("x86-64")` and `cpu_dispatch(x86_64)` are invalid. Tested by commit 9de3b35ac9

Close https://github.com/llvm/llvm-project/issues/59961

Reviewed By: pengfei

Differential Revision: https://reviews.llvm.org/D158811

2023-08-25 20:56:25 -07:00

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