[mono] Add X86Base support.
#20253
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[mono] Add X86Base support.
#20253
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Implement `BitScanForward` and `BitScanReverse` as intrinsics. Implement `__cpuidex` as a netcore-only icall. Rename `cpuid` (in mono-hwcap-x86.c) to `mono_cpuidex`, give it extern linkage, and add support for extended CPUID. Related: dotnet/runtime#40167
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!! This PR is a copy of dotnet/runtime#40861, please do not edit or review it in this repo !!
Do not automatically approve this PR:
* Consider how the changes affect configurations in this repo,
* Check effects on files that are not mirrored,
* Identify test cases that may be needed in this repo.
!! Merge the PR only after the original PR is merged !!
Implement
BitScanForwardandBitScanReverseas intrinsics.Implement
__cpuidexas a netcore-only icall. Renamecpuid(inmono-hwcap-x86.c) to
mono_cpuidex, give it extern linkage, and addsupport for extended CPUID.
Related: dotnet/runtime#40167