Fix a bug indicated by -fsanitize=shift-exponent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233881 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2015-04-02 01:30:10 +00:00
parent 8ce5d8e3e7
commit d148e322a9

View File

@ -320,7 +320,7 @@ bool llvm::UnrollRuntimeLoopProlog(Loop *L, unsigned Count, LoopInfo *LI,
// This constraint lets us deal with an overflowing trip count easily; see the
// comment on ModVal below. This check is equivalent to `Log2(Count) <
// BEWidth`.
if (static_cast<uint64_t>(Count) > (1ULL << BEWidth))
if (BEWidth < 64 && static_cast<uint64_t>(Count) > (1ULL << BEWidth))
return false;
// If this loop is nested, then the loop unroller changes the code in