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Author SHA1 Message Date
Sanjay Patel c229cfeb7a [InstCombine] remove flop from lerp patterns 
(Y * (1.0 - Z)) + (X * Z) -->
Y - (Y * Z) + (X * Z) -->
Y + Z * (X - Y)

This is part of solving:
https://bugs.llvm.org/show_bug.cgi?id=42716

Factoring eliminates an instruction, so that should be a good canonicalization.
The potential conversion to FMA would be handled by the backend based on target
capabilities.

Differential Revision: https://reviews.llvm.org/D65305

llvm-svn: 367101
 2019-07-26 11:19:18 +00:00
Sanjay Patel 8f15d40555 [InstCombine] add tests for lerp patterns (PR42716); NFC 
llvm-svn: 367069
 2019-07-25 22:25:21 +00:00
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 dc185ee275 [InstCombine] fix/enhance fadd/fsub factorization 
(X * Z) + (Y * Z) --> (X + Y) * Z
  (X * Z) - (Y * Z) --> (X - Y) * Z
  (X / Z) + (Y / Z) --> (X + Y) / Z
  (X / Z) - (Y / Z) --> (X - Y) / Z

The existing code that implemented these folds failed to 
optimize vectors, and it transformed code with multiple 
uses when it should not have.

llvm-svn: 339519
 2018-08-12 15:48:26 +00:00
Sanjay Patel ce104b6c16 [InstCombine] move/add tests for fadd/fsub factorization; NFC 
llvm-svn: 339518
 2018-08-12 15:06:15 +00:00