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f87041e363
Try to avoid creating VGBMs by reusing the permutation mask if it contains a zero. If the first byte was into (any byte of) a zero vector, then the first byte of the mask can become zero and reused by putting the mask also as the first operand. If there instead was a first-byte use of the other source operand, then that zero index can be reused if the mask is placed as the second operand. Review: Ulrich Weigand Differential Revision: https://reviews.llvm.org/D79925
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