diff options
| author | Evgeny Stupachenko <evstupac@gmail.com> | 2016-04-27 03:04:54 +0000 |
|---|---|---|
| committer | Evgeny Stupachenko <evstupac@gmail.com> | 2016-04-27 03:04:54 +0000 |
| commit | 23ce61b66334b78ce7a0dd48c24fbf407ca12d8b (patch) | |
| tree | efea78cc6444d7653d38307f6734f96e4b3f412f /llvm/test/Transforms/LoopUnroll/runtime-loop1.ll | |
| parent | c67651dd70b740765cdb809aa0c87236a7eedc1a (diff) | |
| download | bcm5719-llvm-23ce61b66334b78ce7a0dd48c24fbf407ca12d8b.tar.gz bcm5719-llvm-23ce61b66334b78ce7a0dd48c24fbf407ca12d8b.zip | |
The patch fixes PR27392.
Summary:
It is incorrect to compare TripCount (which is BECount + 1)
with extraiters (or Count) to check if we should enter unrolled
loop or not, because TripCount can potentially overflow
(when BECount is max unsigned integer).
While comparing BECount with (Count - 1) is overflow safe and
therefore correct.
Reviewer: hfinkel
Differential Revision: http://reviews.llvm.org/D19256
From: Evgeny Stupachenko <evstupac@gmail.com>
llvm-svn: 267662
Diffstat (limited to 'llvm/test/Transforms/LoopUnroll/runtime-loop1.ll')
| -rw-r--r-- | llvm/test/Transforms/LoopUnroll/runtime-loop1.ll | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/test/Transforms/LoopUnroll/runtime-loop1.ll b/llvm/test/Transforms/LoopUnroll/runtime-loop1.ll index 2e962b5cd38..a2e2f8811d6 100644 --- a/llvm/test/Transforms/LoopUnroll/runtime-loop1.ll +++ b/llvm/test/Transforms/LoopUnroll/runtime-loop1.ll @@ -5,7 +5,7 @@ ; EPILOG: for.body.preheader: -; EPILOG: br i1 %lcmp.mod, label %for.body.preheader.new, label %for.end.loopexit.unr-lcssa, !dbg [[PH_LOC:![0-9]+]] +; EPILOG: br i1 %1, label %for.end.loopexit.unr-lcssa, label %for.body.preheader.new, !dbg [[PH_LOC:![0-9]+]] ; EPILOG: for.body: ; EPILOG: br i1 %niter.ncmp.1, label %for.end.loopexit.unr-lcssa.loopexit, label %for.body, !dbg [[BODY_LOC:![0-9]+]] ; EPILOG-NOT: br i1 %niter.ncmp.2, label %for.end.loopexit{{.*}}, label %for.body |
