llvm-project

Commit Graph

Author	SHA1	Message	Date
Sanjay Patel	6c3af659a2	[DAGCombiner, PowerPC] allow X - (fpext(-Y) --> X + fpext(Y) with multiple uses This is a transform that I limited in instcombine in rL329821 because it was creating more instructions in IR when the cast has multiple uses. But if the cast is free, then we can do the transform regardless of other uses because it improves the potential throughput of the calculation by removing a dependency on the fneg. Differential Revision: https://reviews.llvm.org/D45598 llvm-svn: 330098	2018-04-15 16:43:48 +00:00
Sanjay Patel	9adb386a8e	[PowerPC] add fsub-fneg test; NFC This is a test for a transform that was suggested in the post-commit mailing list thread for rL329821. The target in question is not in trunk, so PPC gets to stand in for it because it's the only in-tree target that sets 'isFPExtFree()' to 'true'. llvm-svn: 329963	2018-04-12 22:14:23 +00:00

Author

SHA1

Message

Date

Sanjay Patel

6c3af659a2

[DAGCombiner, PowerPC] allow X - (fpext(-Y) --> X + fpext(Y) with multiple uses

This is a transform that I limited in instcombine in rL329821 because it was 
creating more instructions in IR when the cast has multiple uses.

But if the cast is free, then we can do the transform regardless of other
uses because it improves the potential throughput of the calculation by
removing a dependency on the fneg.

Differential Revision: https://reviews.llvm.org/D45598

llvm-svn: 330098

2018-04-15 16:43:48 +00:00

Sanjay Patel

9adb386a8e

[PowerPC] add fsub-fneg test; NFC

This is a test for a transform that was suggested in the post-commit
mailing list thread for rL329821. The target in question is not in
trunk, so PPC gets to stand in for it because it's the only in-tree
target that sets 'isFPExtFree()' to 'true'.

llvm-svn: 329963

2018-04-12 22:14:23 +00:00

2 Commits