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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-09-27 21:05:59 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-09-27 21:05:59 +0000 |
| commit | 657720bc6ed1f214c4e7f45f80dcc15b2e168288 (patch) | |
| tree | 0326a848b92d8eb23a28eeae3f6ec63004a439ab /lib/CodeGen/LiveInterval.cpp | |
| parent | cb39aa05afd52f017869ce5399652223626da7b7 (diff) | |
| download | llvm-657720bc6ed1f214c4e7f45f80dcc15b2e168288.tar.gz llvm-657720bc6ed1f214c4e7f45f80dcc15b2e168288.tar.bz2 llvm-657720bc6ed1f214c4e7f45f80dcc15b2e168288.tar.xz | |
Don't dereference begin() on an empty vector.
The fix is obvious and the only test case I have is horrible, so I am
not including it. The problem shows up when self-hosting clang on i386
with -new-coalescer enabled.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164793 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/LiveInterval.cpp')
| -rw-r--r-- | lib/CodeGen/LiveInterval.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp index f4ebcd6fa4..c3bf2d234c 100644 --- a/lib/CodeGen/LiveInterval.cpp +++ b/lib/CodeGen/LiveInterval.cpp @@ -427,7 +427,7 @@ void LiveInterval::join(LiveInterval &Other, // If we have to apply a mapping to our base interval assignment, rewrite it // now. - if (MustMapCurValNos) { + if (MustMapCurValNos && !empty()) { // Map the first live range. iterator OutIt = begin(); |