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Craig Topper
1b3f3aebe1
[X86] Teach combineBitcastvxi1 to prefer movmsk on avx512 in more cases
If the input to the bitcast is a sign bit test, it makes sense to directly use vpmovmskb or vmovmskps/pd. This removes the need to copy the sign bits to a k-register and then to a GPR. Fixes PR46200. Differential Revision: https://reviews.llvm.org/D81327
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