[PATCH] D31167: Use FPContractModeKind universally

[Adam Nemet via Phabricator via cfe-commits]

anemet created this revision.

FPContractModeKind is the codegen option flag which is already ternary (off,
on, fast).  This makes it universally the type for the contractable info
across the front-end:

- In FPOptions (i.e. in the Sema + in the expression nodes).
- In LangOpts::DefaultFPContractMode which is the option that initializes

FPOptions in the Sema.

Another way to look at this change is that before fp-contractable on/off were
the only states handled to the front-end:

- For "on", FMA folding was performed by  the front-end
- For "fast", we simply forwarded the flag to TargetOptions to handle it in LLVM

Now off/on/fast are all exposed because for fast we will generate
fast-math-flags during CodeGen.

This is toward moving fp-contraction=fast from an LLVM TargetOption to a
FastMathFlag in order to fix PR25721.


https://reviews.llvm.org/D31167

Files:
  include/clang/AST/Expr.h
  include/clang/AST/ExprCXX.h
  include/clang/Basic/LangOptions.def
  include/clang/Basic/LangOptions.h
  include/clang/Frontend/CodeGenOptions.def
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/BackendUtil.cpp
  lib/CodeGen/CGExprScalar.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Sema/SemaAttr.cpp

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