[PATCH] D142178: [X86][WIP] Change precision control to FP80 during u64->fp32 conversion on Windows.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: icedrocket, RKSimon, lebedev.ri.
Herald added subscribers: StephenFan, pengfei, hiraditya.
Herald added a project: All.
craig.topper requested review of this revision.
Herald added a project: LLVM.

This is an alternative to D141074 <https://reviews.llvm.org/D141074> to fix the problem by adjusting
the precision control dynamically.

This isn't quite complete yet. I want to support fadd with an load
folded into it too. That's the code we will usually generate.

Posting for early review so we can do some testing of this solution.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142178

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/lib/Target/X86/X86InstrFPStack.td
  llvm/test/CodeGen/X86/uint64-to-float.ll

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