diff options
Diffstat (limited to 'llvm/lib/IR/ConstantRange.cpp')
| -rw-r--r-- | llvm/lib/IR/ConstantRange.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/IR/ConstantRange.cpp b/llvm/lib/IR/ConstantRange.cpp index eda31f73473..f07ec9d5a3f 100644 --- a/llvm/lib/IR/ConstantRange.cpp +++ b/llvm/lib/IR/ConstantRange.cpp @@ -1006,8 +1006,12 @@ ConstantRange::shl(const ConstantRange &Other) const { APInt max = getUnsignedMax(); APInt Other_umax = Other.getUnsignedMax(); + // If we are shifting by maximum amount of + // zero return return the original range. + if (Other_umax.isNullValue()) + return *this; // there's overflow! - if (Other_umax.uge(max.countLeadingZeros())) + if (Other_umax.ugt(max.countLeadingZeros())) return getFull(); // FIXME: implement the other tricky cases |
