Roman Lebedev ec6b91b665 [MIPS] For vectors, select add %x, C as sub %x, -C if it results in inline immediate ...

Summary:
As discussed in https://reviews.llvm.org/D62341#1515637,
for MIPS `add %x, -1` isn't optimal. Unlike X86 there
are no fastpaths to matearialize such `-1`/`1` vector constants,
and `sub %x, 1` results in better codegen,
so undo canonicalization

Reviewers: atanasyan, Petar.Avramovic, RKSimon

Reviewed By: atanasyan

Subscribers: sdardis, arichardson, hiraditya, jrtc27, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66805

llvm-svn: 372254

2019-09-18 19:34:41 +00:00

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