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367b6584ea
This is a follow-up suggested in D86420 - if we have a pair of stores in inverted order for the target endian, we can rotate the source bits into place. The "be_i64_to_i16_order" test shows a limitation of the current function (which might be avoided if we integrate this function with the other cases in mergeConsecutiveStores). In the earlier "be_i64_to_i16" test, we skip the first 2 stores because we do not match the full set as consecutive or rotate-able, but then we reach the last 2 stores and see that they are an inverted pair of 16-bit stores. The "be_i64_to_i16_order" test alters the program order of the stores, so we miss matching the sub-pattern. Differential Revision: https://reviews.llvm.org/D87112 |
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