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LLVM prefers vxorps to vpxor when out-of-context #303
Description
LLVM prefers to generate vxorps instructions to vpxor when out-of-context even though one might be using integer vectors because the encoding of that instruction is shorter.
There is an LLVM patch for this here: https://reviews.llvm.org/D7401
And a bug report with some more information here:
This affects following intrinsics (maybe incomplete):
-
_mm256_xor_si256(need to add a comment to the source code)
Activity
[-]LLVM prefers vxorps to pxor and vpxor when out-of-context[/-][+]LLVM prefers vxorps to vpxor when out-of-context[/+]