Commit Graph

3 Commits

Author SHA1 Message Date
Florian Hahn ac27758895 [LoopUnroll] Only peel if a predicate becomes known in the loop body.
If a predicate does not become known after peeling, peeling is unlikely
to be beneficial.

Reviewers: mcrosier, efriedma, mkazantsev, junbuml

Reviewed By: mkazantsev

Differential Revision: https://reviews.llvm.org/D44983

llvm-svn: 330250
2018-04-18 12:29:24 +00:00
Florian Hahn 52436a587e [LoopUnroll] Simplify induction variables after peeling too.
Loop peeling also has an impact on the induction variables, so we should
benefit from induction variable simplification after peeling too.

Reviewers: sanjoy, bogner, mzolotukhin, efriedma

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D43878

llvm-svn: 328301
2018-03-23 10:38:12 +00:00
Florian Hahn fc97b6173f [LoopUnroll] Peel off iterations if it makes conditions true/false.
If the loop body contains conditions of the form IndVar < #constant, we
can remove the checks by peeling off #constant iterations.

This improves codegen for PR34364.

Reviewers: mkuper, mkazantsev, efriedma

Reviewed By: mkazantsev

Differential Revision: https://reviews.llvm.org/D43876

llvm-svn: 327671
2018-03-15 21:34:43 +00:00