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[MSP430] Optimize 'shl x, 8[+ N] -> swpb(zext(x)) [<< N]' for i16
authorAnton Korobeynikov <anton@korobeynikov.info>
Wed, 9 Jan 2019 13:03:01 +0000 (13:03 +0000)
committerAnton Korobeynikov <anton@korobeynikov.info>
Wed, 9 Jan 2019 13:03:01 +0000 (13:03 +0000)
commit6a2a4f9b3e165546e66e6bd317a464caa543b02c
treed5ebe8697d6658f32a60f52696534238e371f76ctree | snapshot
parent7edabba9cf0ea0276ec22aa97faba757244fe6ddcommit | diff
[MSP430] Optimize 'shl x, 8[+ N] -> swpb(zext(x)) [<< N]' for i16

Perform additional simplification to reduce shift amount.

Patch by Kristina Bessonova!

Differential Revision: https://reviews.llvm.org/D56016

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350712 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Target/MSP430/MSP430ISelLowering.cpp diff | blob | history
test/CodeGen/MSP430/shifts.ll diff | blob | history
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