Qiu Chaofan 1b2fe71ecf [DAGCombiner] Tighten reasscociation of visitFMA ...

From LangRef, FMF contract should not enable reassociating to form
arbitrary contractions. So it should not help rearrange nodes like
(fma (fmul x, c1), c2, y) into (fma x, c1*c2, y).

Reviewed By: spatel

Differential Revision: https://reviews.llvm.org/D89527

2020-10-20 10:13:01 +08:00

860 KiB

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