Add in support for getIntPtrType to get the pointer type based on the address space.

This checkin also adds in some tests that utilize these paths and updates some of the
clients.

llvm-svn: 166578

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/lib/VMCore/Instructions.cpp b/llvm/lib/VMCore/Instructions.cpp
index 13c4a5d2574..e9b96d6cd22 100644
--- a/llvm/lib/VMCore/Instructions.cpp
+++ b/llvm/lib/VMCore/Instructions.cpp
@@ -2120,6 +2120,17 @@ bool CastInst::isNoopCast(Type *IntPtrTy) const {
   return isNoopCast(getOpcode(), getOperand(0)->getType(), getType(), IntPtrTy);
 }
 
+/// @brief Determine if a cast is a no-op
+bool CastInst::isNoopCast(const DataLayout &DL) const {
+  unsigned AS = 0;
+  if (getOpcode() == Instruction::PtrToInt)
+    AS = getOperand(0)->getType()->getPointerAddressSpace();
+  else if (getOpcode() == Instruction::IntToPtr)
+    AS = getType()->getPointerAddressSpace();
+  Type *IntPtrTy = DL.getIntPtrType(getContext(), AS);
+  return isNoopCast(getOpcode(), getOperand(0)->getType(), getType(), IntPtrTy);
+}
+
 /// This function determines if a pair of casts can be eliminated and what 
 /// opcode should be used in the elimination. This assumes that there are two 
 /// instructions like this: