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Craig Topper
04c3e7a651
[RISCV] Pad v4i1/v2i1/v1i1 stores with 0s to make a full byte.
As noted in the FIXME there's a sort of agreement that the any extra bits stored will be 0. The generated code is pretty terrible. I was really hoping we could use a tail undisturbed trick, but tail undisturbed no longer applies to masked destinations in the current draft spec. Fingers crossed that it isn't common to do this. I doubt IR from clang or the vectorizer would ever create this kind of store. Reviewed By: frasercrmck Differential Revision: https://reviews.llvm.org/D100618
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