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David Bolvansky 05aaf88531 [InstCombine] Fold Select with binary op - FP opcodes
Summary:
Follow up for https://reviews.llvm.org/rL339520 and https://reviews.llvm.org/rL338300

Alive:

```
%A = fcmp oeq float %x, 0.0
%B = fadd nsz float %x, %z
%C = select i1 %A, float %B, float %y
=>
%C = select i1 %A, float %z, float %y
----------                                                                      
  %A = fcmp oeq float %x, 0.0
  %B = fadd nsz float %x, %z
  %C = select %A, float %B, float %y
=>
  %C = select %A, float %z, float %y

Done: 1                                                                         
Optimization is correct

%A = fcmp une float %x, -0.0
%B = fadd nsz float %x, %z
%C = select i1 %A, float %y, float %B
=>
%C = select i1 %A, float %y, float %z
----------                                                                      
  %A = fcmp une float %x, -0.0
  %B = fadd nsz float %x, %z
  %C = select %A, float %y, float %B
=>
  %C = select %A, float %y, float %z

Done: 1                                                                         
Optimization is correct
```


Reviewers: spatel, lebedev.ri

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D50714

llvm-svn: 340538
2018-08-23 15:22:15 +00:00
..
2018-08-05 14:53:08 +00:00
2018-08-17 14:39:53 +00:00