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Commit a45584be authored by Stanislav Mekhanoshin's avatar Stanislav Mekhanoshin
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Fold fneg and fabs like multiplications 

Given no NaNs and no signed zeroes it folds:

(fmul X, (select (fcmp X > 0.0), -1.0, 1.0)) -> (fneg (fabs X))
(fmul X, (select (fcmp X > 0.0), 1.0, -1.0)) -> (fabs X)

Differential Revision: https://reviews.llvm.org/D34579

llvm-svn: 306592
parent 57f57262
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