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Author SHA1 Message Date
Kai Luo 44bd8ea167 [DAGCombine][PowerPC] Simplify nabs by using legal `smin` operation 
Convert `0 - abs(x)` to `smin (x, -x)` if `smin` is a legal operation.

Verification: https://alive2.llvm.org/ce/z/vpquFR

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D92637
 2020-12-08 03:24:07 +00:00
Kai Luo f5d52916ce [PowerPC] Pre-commit neg abs test for vector. NFC. 2020-12-04 06:52:05 +00:00
Kai Luo 5931be60b5 [DAGCombine][PowerPC] Convert negated abs to trivial arithmetic ops 
This patch converts `0 - abs(x)` to `Y = sra (X, size(X)-1); sub (Y, xor (X, Y))` for better codegen.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D91120
 2020-11-24 09:43:35 +00:00
Kai Luo c2460c3254 [PowerPC] Add negated abs test using llvm.abs intrinsic. NFC. 2020-11-17 09:28:56 +00:00