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Author SHA1 Message Date
Sam Parker 94b195ff12 [ARM][LowOverheadLoops] Add horizontal reduction support 
Add a bit more logic into the 'FalseLaneZeros' tracking to enable
horizontal reductions and also make the VADDV variants
validForTailPredication.

Differential Revision: https://reviews.llvm.org/D76708
 2020-03-30 09:55:41 +01:00
Sam Parker d7084fa34a [ARM][LowOverheadLoops] DoubleWidthResult instructions canGenerateZeros 
Given that some instructions generate wider result elements than
their inputs, flag them as being able to generate non zeros in the
false lanes.

Differential Revision: https://reviews.llvm.org/D76766
 2020-03-27 15:26:13 +00:00
Sam Parker 51cad66e97 [NFC][ARM] Add test 
Precommit test for LowOverheadLoops.
 2020-03-11 11:51:52 +00:00