[PATCH] D154605: Not to perform FMA bydefault

[Kishan Parmar via Phabricator via cfe-commits]

long5hot created this revision.
long5hot added reviewers: andrew.w.kaylor, t.p.northover, kristof.beyls, john.brawn, asb, jhibbits, nemanjai.
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Clang frontend performs FMA bydefault based on option ffp-contract=on and fast.
It does not check if the target supports fma or not(for e.x. X86 Nehalem and core2).

Intent of this patch is to check if fma is supported or not.
for now checking on X86 only because it has +fma in target-features.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154605

Files:
  clang/include/clang/Basic/TargetInfo.h
  clang/lib/CodeGen/CGExprScalar.cpp
  clang/test/CodeGen/X86/fexcess-precision-bfloat16.c
  clang/test/CodeGen/X86/fexcess-precision.c
  clang/test/CodeGen/arithmetic-fence-builtin.c
  clang/test/CodeGen/constrained-math-builtins.c
  clang/test/CodeGen/ffp-contract-option.c
  clang/test/CodeGen/ffp-model.c
  clang/test/CodeGen/fp-contract-on-asm.c
  clang/test/CodeGen/fp-contract-pragma.cpp
  clang/test/CodeGen/fp-floatcontrol-stack.cpp
  clang/test/CodeGenOpenCL/cl20-device-side-enqueue-attributes.cl
  clang/test/CodeGenOpenCL/single-precision-constant.cl
  clang/test/PCH/pragma-floatcontrol.c

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