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Commit 45d19282 authored by Andrew Zhogin's avatar Andrew Zhogin
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[DAGCombiner] visitRotate patch to optimize pair of ROTR/ROTL instructions... 

[DAGCombiner] visitRotate patch to optimize pair of ROTR/ROTL instructions into one with combined shift operand.

For two ROTR operations with shifts C1, C2; combined shift operand will be (C1 + C2) % bitsize.

Differential revision: https://reviews.llvm.org/D12833

llvm-svn: 307179
parent d7faa916
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