PR4326: Handle constant evaluation for void* pointer subtraction

correctly.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72886 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index 50fdcfd6eb..0b1632f234 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -946,7 +946,12 @@ bool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
         const QualType ElementType = Type->getAsPointerType()->getPointeeType();
 
         uint64_t D = LHSValue.getLValueOffset() - RHSValue.getLValueOffset();
-        D /= Info.Ctx.getTypeSize(ElementType) / 8;
+        uint64_t ElemSize;
+        if (ElementType->isVoidType() || ElementType->isFunctionType())
+          ElemSize = 8;
+        else
+          ElemSize = Info.Ctx.getTypeSize(ElementType);
+        D /= ElemSize / 8;
 
         return Success(D, E);
       }