[PATCH] D154933: [PowerPC] Implement llvm.set.rounding intrinsic

[Qiu Chaofan via Phabricator via llvm-commits]

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According to LangRef, `llvm.set.rounding` sets rounding mode by integer argument:

> 0  - toward zero
> 1  - to nearest, ties to even
> 2  - toward positive infinity
> 3  - toward negative infinity
> 4  - to nearest, ties away from zero

While PowerPC ISA says:

> 0 - to nearest
> 1 - toward zero
> 2 - toward positive infinity
> 3 - toward negative infinity

This patch maps the argument and write into last two bits of FPSCR (rounding mode).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154933

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.h
  llvm/test/CodeGen/PowerPC/frounds.ll

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