diff --git a/llvm/lib/IR/Type.cpp b/llvm/lib/IR/Type.cpp
--- a/llvm/lib/IR/Type.cpp
+++ b/llvm/lib/IR/Type.cpp
@@ -132,7 +132,8 @@
 }
 
 unsigned Type::getScalarSizeInBits() const {
-  return getScalarType()->getPrimitiveSizeInBits();
+  // It is safe to assume that the scalar types have a fixed size.
+  return getScalarType()->getPrimitiveSizeInBits().getFixedSize();
 }
 
 int Type::getFPMantissaWidth() const {