Commit Graph

7 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
Benjamin Kramer 0d2fc1a501 [InstCombine] Teach SimplifyDemandedBits that udiv doesn't demand low dividend bits that are zero in the divisor
This is safe as long as the udiv is not exact. The pattern is not common in
C++ code, but comes up all the time in code generated by XLA's GPU backend.

Differential Revision: https://reviews.llvm.org/D46647

llvm-svn: 331933
2018-05-09 22:27:34 +00:00
Simon Pilgrim 6720726d27 [ValueTracking] Don't assume shift values are in range
Reduced (as best I could...) from oss-fuzz #4857 test case

llvm-svn: 321634
2018-01-01 22:44:59 +00:00
Simon Pilgrim af35f5ec1d [InstCombine] Regenerate udiv tests.
llvm-svn: 321633
2018-01-01 22:27:49 +00:00
Andrea Di Biagio a82d52d11d [InstCombine] Teach the udiv folding logic how to handle constant expressions.
This patch fixes PR30366.

Function foldUDivShl() worked under the assumption that one of the values
in input to the function was always an instance of llvm::Instruction.
However, function visitUDivOperand() (the only user of foldUDivShl) was
clearly violating that precondition; internally, visitUDivOperand() uses pattern
matches to check the operands of a udiv. Pattern matchers for binary operators
know how to handle both Instruction and ConstantExpr values.

This patch fixes the problem in foldUDivShl(). Now we use pattern matchers
instead of explicit casts to Instruction. The reduced test case from PR30366
has been added to test file InstCombine/udiv-simplify.ll.

Differential Revision: https://reviews.llvm.org/D24565

llvm-svn: 282398
2016-09-26 12:07:23 +00:00
Andrea Di Biagio e8e1af3649 [InstCombine] Merged two test files and regenerated checks using update_test_checks.py. NFC.
llvm-svn: 281478
2016-09-14 14:18:21 +00:00