David Green 54b0115547 [ARM] Use sub for negative offset load/store in thumb1 ...

This attempts to optimise negative values used in load/store operands
a little. We currently try to selct them as rr, materialising the
negative constant using a MOV/MVN pair. This instead selects ri with
an immediate of 0, forcing the add node to become a simpler sub.

Differential Revision: https://reviews.llvm.org/D57121

llvm-svn: 352475

2019-01-29 10:40:31 +00:00

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