[opaque pointer types] [NFC] GEP: replace get(Pointer)ElementType uses with get{Source,Result}ElementType.

Summary:
GEPOperator: provide getResultElementType alongside getSourceElementType.
This is made possible by adding a result element type field to GetElementPtrConstantExpr, which GetElementPtrInst already has.

GEP: replace get(Pointer)ElementType uses with get{Source,Result}ElementType.

Reviewers: mjacob, dblaikie

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D16275

llvm-svn: 258145

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/IR/Operator.cpp b/llvm/lib/IR/Operator.cpp
index 77dc680af11..8a94053a72c 100644
--- a/llvm/lib/IR/Operator.cpp
+++ b/llvm/lib/IR/Operator.cpp
@@ -12,6 +12,12 @@ Type *GEPOperator::getSourceElementType() const {
   return cast<GetElementPtrConstantExpr>(this)->getSourceElementType();
 }
 
+Type *GEPOperator::getResultElementType() const {
+  if (auto *I = dyn_cast<GetElementPtrInst>(this))
+    return I->getResultElementType();
+  return cast<GetElementPtrConstantExpr>(this)->getResultElementType();
+}
+
 bool GEPOperator::accumulateConstantOffset(const DataLayout &DL,
                                            APInt &Offset) const {
   assert(Offset.getBitWidth() ==