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Author SHA1 Message Date
Eric Christopher cee313d288 Revert "Temporarily Revert "Add basic loop fusion pass."" 
The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552
 2019-04-17 04:52:47 +00:00
Eric Christopher a863435128 Temporarily Revert "Add basic loop fusion pass." 
As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546
 2019-04-17 02:12:23 +00:00
Sanjay Patel c26fd1e772 [InstCombine] canonicalize -0.0 to +0.0 in fcmp 
As stated in IEEE-754 and discussed in:
https://bugs.llvm.org/show_bug.cgi?id=38086
...the sign of zero does not affect any FP compare predicate.

Known regressions were fixed with:
rL346097 (D54001)
rL346143

The transform will help reduce pattern-matching complexity to solve:
https://bugs.llvm.org/show_bug.cgi?id=39475
...as well as improve CSE and codegen (a zero constant is almost always
easier to produce than 0x80..00).

llvm-svn: 346147
 2018-11-05 17:26:42 +00:00
Sanjay Patel 87aa10062c [InstCombine] loosen FP 0.0 constraint for fcmp+select substitution 
It looks like we correctly removed edge cases with 0.0 from D50714,
but we were a bit conservative because getBinOpIdentity() doesn't
distinguish between +0.0 and -0.0 and 'nsz' is effectively always
true for fcmp (see discussion in:
https://bugs.llvm.org/show_bug.cgi?id=38086

Without this change, we would get regressions by canonicalizing
to +0.0 in all fcmp, and that's a step towards solving:
https://bugs.llvm.org/show_bug.cgi?id=39475

llvm-svn: 346143
 2018-11-05 16:50:44 +00:00
Sanjay Patel 8b2a1f7fd9 [InstCombine] adjust tests for select with FP identity op; NFC 
These are mislabeled as negative tests.

llvm-svn: 346142
 2018-11-05 16:27:03 +00:00
Sanjay Patel 92a53eabc6 [InstCombine] add/adjust tests for select with fsub identity op; NFC 
llvm-svn: 346138
 2018-11-05 15:45:01 +00:00
Sanjay Patel 278db2fba1 [InstCombine] add tests for select with FP identity op; NFC 
llvm-svn: 346136
 2018-11-05 15:08:36 +00:00
David Bolvansky 43b0e25847 [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
David Bolvansky ba74d1c4ea [NFC] Tests for select with binop fold - FP opcodes 
llvm-svn: 339692
 2018-08-14 17:03:47 +00:00
David Bolvansky ddfe408f9a [NFC] Renamed test file 
llvm-svn: 339523
 2018-08-12 17:43:27 +00:00