[PATCH] D113642: [PowerPC] Provide XL-compatible vec_round implementation

[Nemanja Ivanovic via Phabricator via llvm-commits]

nemanjai created this revision.
nemanjai added reviewers: PowerPC, rzurob, qiongsiwu.
Herald added subscribers: shchenz, kbarton, hiraditya.
nemanjai requested review of this revision.
Herald added projects: clang, LLVM.

The XL implementation of `vec_round` for `vector double` uses "round-to-nearest, ties to even" just as the `vector float` version does. However clang and gcc use "round-to-nearest-away" for `vector double` and "round-to-nearest, ties to even" for `vector float`.

The XL behaviour is implemented under the `__XL_COMPAT_ALTIVEC__` macro similarly to other instances of incompatibility.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D113642

Files:
  clang/lib/Headers/altivec.h
  clang/test/CodeGen/builtins-ppc-vsx.c
  clang/test/CodeGen/builtins-ppc-xlcompat.c
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/test/CodeGen/PowerPC/read-set-flm.ll

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