3156db9097
Pull in r223171 from upstream llvm trunk (by Michael Zolotukhin): PR21302. Vectorize only bottom-tested loops. rdar://problem/18886083 This fixes a bug in the llvm vectorizer, which could sometimes cause vectorized loops to perform an additional iteration, leading to possible buffer overruns. Symptoms of this, which are usually segfaults, were first noticed when building gcc ports, here: https://lists.freebsd.org/pipermail/freebsd-ports/2014-September/095466.html https://lists.freebsd.org/pipermail/freebsd-toolchain/2014-September/001211.html Since this fix is very important for ports, bump __FreeBSD_version to make it easier for port maintainers to test whether the fix has been applied. Upstream PR: http://llvm.org/PR21302 |
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