Geoff Berry e0bf52f394 [AArch64LoadStoreOptimizer] Don't treat write to XZR/WZR as a clobber. ...

Summary:
When searching for load/store instructions to pair/merge don't treat
writes to WZR/XZR as clobbers since they don't change the value read
from WZR/XZR (which is always 0).

Reviewers: mcrosier, junbuml, jmolloy, t.p.northover

Subscribers: aemerson, llvm-commits, rengolin

Differential Revision: https://reviews.llvm.org/D26921

llvm-svn: 287592

2016-11-21 22:51:10 +00:00

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