[PATCH] D116039: [X86] Combine reduce(mul x, y) to VNNI instruction.

[LuoYuanke via Phabricator via llvm-commits]

LuoYuanke created this revision.
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For below C code, we can use VNNI to combine the mul and add operation.
int usdot_prod_qi(unsigned char *restrict a, char *restrict b, int c,

                  int n) {
  int i;
  for (i = 0; i < 32; i++) {
    c += ((int)a[i] * (int)b[i]);
  }
  return c;

}
We didn't support the combine acoss basic block in this patch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D116039

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86PartialReduction.cpp
  llvm/test/CodeGen/X86/dpbusd.ll

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