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| 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/lib/Support/Host.cpp | |
| parent | c67651dd70b740765cdb809aa0c87236a7eedc1a (diff) | |
| download | llvm-23ce61b66334b78ce7a0dd48c24fbf407ca12d8b.zip llvm-23ce61b66334b78ce7a0dd48c24fbf407ca12d8b.tar.gz llvm-23ce61b66334b78ce7a0dd48c24fbf407ca12d8b.tar.bz2 | |
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/lib/Support/Host.cpp')
0 files changed, 0 insertions, 0 deletions