[PATCH] D83897: [X86] Add a generic 32-bit CPU with sse2 with modern tuning flags to be used as the default for the 32-bit targets instead of pentium4

[Craig Topper via Phabricator via cfe-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel, echristo, andreadb.
Herald added subscribers: jfb, hiraditya.
Herald added a project: LLVM.

Currently our default 32-bit CPU on Linux and Windows is "pentium4" which comes with pentium4 tuning settings and almost non-existent scheduler.

This patch proposes to add a 32-bit CPU with sse2, but with more modern tuning settings to replace the default pentium4. I've chosen this way so that -march=pentium4 behavior doesn't change. Alternatively we can just change the pentium4 settings and assume no one cares about truly tuning for pentium4 these days.

This would be unnecessary if -mtune were supported, but this is a lot less effort than plumbing mtune.


https://reviews.llvm.org/D83897

Files:
  clang/lib/Basic/Targets/X86.cpp
  clang/lib/Driver/ToolChains/Arch/X86.cpp
  clang/test/Driver/nacl-direct.c
  clang/test/Driver/x86_features.c
  clang/test/Misc/target-invalid-cpu-note.c
  llvm/include/llvm/Support/X86TargetParser.h
  llvm/lib/Support/X86TargetParser.cpp
  llvm/lib/Target/X86/X86.td

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