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We could go either direction on this transform. VectorCombine already goes this way for bitcasts (and handles more complicated cases using the cost model), so let's try cast-first. Deferring completely to VectorCombine is another possibility. But the backend should be able to invert this easily when the vectors have the same shape, so it doesn't seem like a transform that we need to avoid. The motivating example from https://llvm.org/PR49081 has an int-to-float sandwiched between 2 shuffles, and the backend currently does not reduce that, so on x86, we get something like: pshufd $249, %xmm0, %xmm0] cvtdq2ps %xmm0, %xmm0 shufps $144, %xmm0, %xmm0 ...instead of just a single conversion instruction. Differential Revision: https://reviews.llvm.org/D103038 |
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