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Let's say you represent (i32, i32) as an i64 from which the parts are extracted with lshr/trunc. Then, if you compare two tuples by parts you get something like A[0] == B[0] && A[1] == B[1], just that the part extraction happens by lshr/trunc and not a narrow load or similar. The fold implemented here reduces such equality comparisons by converting them into a comparison on a larger part of the integer (which might be the whole integer). It handles both the "and of eq" and the conjugated "or of ne" case. I'm being conservative with one-use for now, though this could be relaxed if profitable (the base pattern converts 11 instructions into 5 instructions, but there's quite a few variations on how it can play out). Differential Revision: https://reviews.llvm.org/D101232 |
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