[PATCH] D115441: [X86][MS] Add 80bit long double support for Windows

[Phoebe Wang via Phabricator via llvm-commits]

pengfei created this revision.
pengfei added reviewers: rnk, andrew.w.kaylor, erichkeane, craig.topper.
Herald added a subscriber: hiraditya.
pengfei requested review of this revision.
Herald added projects: clang, LLVM.
Herald added subscribers: llvm-commits, cfe-commits.

MSVC currently doesn't support 80 bits long double. But ICC does support
it on Windows. Besides, there're also some users asked for this feature.
We can find the discussions from stackoverflow, msdn etc.

Given Clang has already support `-mlong-double-80`, extending it to
support for Windows seems worthwhile.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D115441

Files:
  clang/lib/Basic/TargetInfo.cpp
  clang/lib/Basic/Targets/X86.h
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/test/CodeGen/X86/long-double-config-size.c
  clang/test/CodeGen/target-data.c
  llvm/lib/Target/X86/X86TargetMachine.cpp
  llvm/test/CodeGen/X86/scalar-fp-to-i32.ll
  llvm/test/CodeGen/X86/scalar-fp-to-i64.ll

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