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Author SHA1 Message Date
Chen Zheng 3f85134d71 [PowerPC] implement target hook isProfitableToHoist 
On Powerpc fma is faster than fadd + fmul for some types,
(PPCTargetLowering::isFMAFasterThanFMulAndFAdd). we should implement target
hook isProfitableToHoist to prevent simplifyCFGpass from breaking fma
pattern by hoisting fmul to predecessor block.

Reviewed By: nemanjai

Differential Revision: https://reviews.llvm.org/D76207
 2020-03-19 00:17:25 -04:00
Chen Zheng fa72b29bec [PowerPC] add test cases for target hook isProfitableToHoist - NFC 2020-03-16 23:07:30 -04:00