[PATCH] D158487: [PowerPC][altivec] Optimize codegen of vec_promote

[Kai Luo via Phabricator via cfe-commits]

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According to https://www.ibm.com/docs/en/xl-c-and-cpp-linux/16.1.1?topic=functions-vec-promote, elements not specified by the input index argument are undefined. So that we don't need to set these elements to be zeros.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158487

Files:
  clang/lib/Headers/altivec.h
  clang/test/CodeGen/PowerPC/builtins-ppc-vsx.c
  llvm/test/CodeGen/PowerPC/vec-promote.ll

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