Commit Graph

6 Commits

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
Nikita Popov 7462303e06 [InstCombine] Use uadd.sat and usub.sat for canonicalization
Start using the uadd.sat and usub.sat intrinsics for the existing
canonicalizations. These intrinsics should optimize better than
expanded IR, have better handling in the X86 backend and should
be no worse than expanded IR in other backends, as far as we know.

rL357012 already introduced use of uadd.sat for the add+umin pattern.

Differential Revision: https://reviews.llvm.org/D58872

llvm-svn: 357103
2019-03-27 17:56:15 +00:00
Sanjay Patel e9a153f414 [InstCombine] add unsigned saturation subtraction canonicalizations
This is the instcombine part of unsigned saturation canonicalization.
Backend patches already commited: 
https://reviews.llvm.org/D37510
https://reviews.llvm.org/D37534

It converts unsigned saturated subtraction patterns to forms recognized 
by the backend:
(a > b) ? a - b : 0 -> ((a > b) ? a : b) - b)
(b < a) ? a - b : 0 -> ((a > b) ? a : b) - b)
(b > a) ? 0 : a - b -> ((a > b) ? a : b) - b)
(a < b) ? 0 : a - b -> ((a > b) ? a : b) - b)
((a > b) ? b - a : 0) -> - ((a > b) ? a : b) - b)
((b < a) ? b - a : 0) -> - ((a > b) ? a : b) - b)
((b > a) ? 0 : b - a) -> - ((a > b) ? a : b) - b)
((a < b) ? 0 : b - a) -> - ((a > b) ? a : b) - b)

Patch by Yulia Koval!

Differential Revision: https://reviews.llvm.org/D41480

llvm-svn: 324255
2018-02-05 17:53:29 +00:00
Sanjay Patel a767ee5af0 [InstCombine] make sure tests are providing coverage for the stated pattern; NFC
Without extra instructions and uses, swapMayExposeCSEOpportunities() would change
the icmp (as seen in the check lines), so we were not actually testing patterns 
that should be handled by D41480.

llvm-svn: 324143
2018-02-02 21:40:54 +00:00
Sanjay Patel 5b8cb26bcc [InstCombine] add baseline tests for unsigned saturated sub (D41480); NFC
llvm-svn: 324109
2018-02-02 17:43:16 +00:00