From e8a7e593e6caf0d9ecaac24033bc886081949181 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 21 Jul 2004 04:27:24 +0000
Subject: [PATCH] Remove special casing of pointers and treat them generically
 as integers of the appopriate size.  This gives us the ability to eliminate
 int -> ptr -> int

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15063 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/InstructionCombining.cpp | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 376222ffe27..4634b6d9c42 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -1974,14 +1974,11 @@ static inline bool isEliminableCastOfCast(const Type *SrcTy, const Type *MidTy,
   if (SrcTy == DstTy && SrcTy->isLosslesslyConvertibleTo(MidTy))
     return true;
 
-  // If the source and destination types are pointer types, and the intermediate
-  // is an integer type bigger than a pointer, eliminate the casts.
-  if (isa<PointerType>(SrcTy) && isa<PointerType>(DstTy)) {
-    if (isa<PointerType>(MidTy)) return true;
-
-    if (MidTy->isInteger() && MidTy->getPrimitiveSize() >= TD->getPointerSize())
-      return true;
-  }
+  // If we are casting between pointer and integer types, treat pointers as
+  // integers of the appropriate size for the code below.
+  if (isa<PointerType>(SrcTy)) SrcTy = TD->getIntPtrType();
+  if (isa<PointerType>(MidTy)) MidTy = TD->getIntPtrType();
+  if (isa<PointerType>(DstTy)) DstTy = TD->getIntPtrType();
 
   // Allow free casting and conversion of sizes as long as the sign doesn't
   // change...