Commit 1b2fe71e authored by Qiu Chaofan's avatar Qiu Chaofan
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[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
parent 76c00926
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