implement constant expr. sub ptr ptr
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52049 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprConstant.cpp b/lib/CodeGen/CGExprConstant.cpp
index be9eaad..58b1884 100644
--- a/lib/CodeGen/CGExprConstant.cpp
+++ b/lib/CodeGen/CGExprConstant.cpp
@@ -447,9 +447,19 @@
// int - int
return llvm::ConstantExpr::getSub(LHS, RHS);
}
-
- assert(0 && "Unhandled bin sub case!");
- return 0;
+
+ assert(isa<llvm::PointerType>(LHS->getType()));
+
+ const llvm::Type *ResultType = ConvertType(E->getType());
+ const QualType Type = E->getLHS()->getType();
+ const QualType ElementType = Type->getAsPointerType()->getPointeeType();
+
+ LHS = llvm::ConstantExpr::getPtrToInt(LHS, ResultType);
+ RHS = llvm::ConstantExpr::getPtrToInt(RHS, ResultType);
+
+ llvm::Constant *sub = llvm::ConstantExpr::getSub(LHS, RHS);
+ llvm::Constant *size = EmitSizeAlignOf(ElementType, E->getType(), true);
+ return llvm::ConstantExpr::getSDiv(sub, size);
}
llvm::Constant *VisitBinShl(const BinaryOperator *E) {