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Single Precision
Summary:
This was found during review of https://reviews.llvm.org/D66050.
In the simple test of fdiv, we miss to fold
```
fneg 2, 2
xsmaddasp 3, 2, 0
```
to
```
xsnmsubasp 3, 2, 0
```
We have the patterns for Double Precision and vectors, just missing
Single Precision, the patch add that.
Reviewers: #powerpc, hfinkel, nemanjai, steven.zhang
Reviewed By: #powerpc, steven.zhang
Subscribers: wuzish, hiraditya, kbarton, MaskRay, shchenz, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D67595
llvm-svn: 372985
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