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17ff9199a5
We already do the following combines: (bitcast int (and (bitcast fp X to int), 0x7fff...) to fp) -> fabs X (bitcast int (xor (bitcast fp X to int), 0x8000...) to fp) -> fneg X When the target has "bit preserving fp logic". This patch just extends it to also combine: (bitcast int (or (bitcast fp X to int), 0x8000...) to fp) -> fneg (fabs X) As some targets have fnabs and even those that don't can efficiently lower both the fabs and the fneg. Differential revision: https://reviews.llvm.org/D44548 llvm-svn: 344093 |
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