From 0b178e25c4104f3577fed6e66bd2c17f9fc08eb2 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 2 Jan 2010 00:31:05 +0000
Subject: [PATCH] remove the instcombine transformations that are inserting
 nasty pointer to int casts that confuse later optimizations.  See PR3351 for
 details.

This improves but doesn't complete fix 483.xalancbmk because llvm-gcc
does this xform in GCC's "fold" routine as well.  Clang++ will do
better I guess.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92408 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../Scalar/InstructionCombining.cpp           | 30 -------------------
 test/Transforms/InstCombine/or.ll             | 15 ----------
 2 files changed, 45 deletions(-)

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 5f210da423b..2a0df31a5fe 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -4166,21 +4166,6 @@ Value *InstCombiner::FoldLogicalPlusAnd(Value *LHS, Value *RHS,
 /// FoldAndOfICmps - Fold (icmp)&(icmp) if possible.
 Instruction *InstCombiner::FoldAndOfICmps(Instruction &I,
                                           ICmpInst *LHS, ICmpInst *RHS) {
-  // (icmp eq A, null) & (icmp eq B, null) -->
-  //     (icmp eq (ptrtoint(A)|ptrtoint(B)), 0)
-  if (TD &&
-      LHS->getPredicate() == ICmpInst::ICMP_EQ &&
-      RHS->getPredicate() == ICmpInst::ICMP_EQ &&
-      isa<ConstantPointerNull>(LHS->getOperand(1)) &&
-      isa<ConstantPointerNull>(RHS->getOperand(1))) {
-    const Type *IntPtrTy = TD->getIntPtrType(I.getContext());
-    Value *A = Builder->CreatePtrToInt(LHS->getOperand(0), IntPtrTy);
-    Value *B = Builder->CreatePtrToInt(RHS->getOperand(0), IntPtrTy);
-    Value *NewOr = Builder->CreateOr(A, B);
-    return new ICmpInst(ICmpInst::ICMP_EQ, NewOr,
-                        Constant::getNullValue(IntPtrTy));
-  }
-  
   Value *Val, *Val2;
   ConstantInt *LHSCst, *RHSCst;
   ICmpInst::Predicate LHSCC, RHSCC;
@@ -4861,21 +4846,6 @@ static Instruction *MatchSelectFromAndOr(Value *A, Value *B,
 /// FoldOrOfICmps - Fold (icmp)|(icmp) if possible.
 Instruction *InstCombiner::FoldOrOfICmps(Instruction &I,
                                          ICmpInst *LHS, ICmpInst *RHS) {
-  // (icmp ne A, null) | (icmp ne B, null) -->
-  //     (icmp ne (ptrtoint(A)|ptrtoint(B)), 0)
-  if (TD &&
-      LHS->getPredicate() == ICmpInst::ICMP_NE &&
-      RHS->getPredicate() == ICmpInst::ICMP_NE &&
-      isa<ConstantPointerNull>(LHS->getOperand(1)) &&
-      isa<ConstantPointerNull>(RHS->getOperand(1))) {
-    const Type *IntPtrTy = TD->getIntPtrType(I.getContext());
-    Value *A = Builder->CreatePtrToInt(LHS->getOperand(0), IntPtrTy);
-    Value *B = Builder->CreatePtrToInt(RHS->getOperand(0), IntPtrTy);
-    Value *NewOr = Builder->CreateOr(A, B);
-    return new ICmpInst(ICmpInst::ICMP_NE, NewOr,
-                        Constant::getNullValue(IntPtrTy));
-  }
-  
   Value *Val, *Val2;
   ConstantInt *LHSCst, *RHSCst;
   ICmpInst::Predicate LHSCC, RHSCC;
diff --git a/test/Transforms/InstCombine/or.ll b/test/Transforms/InstCombine/or.ll
index 4a140815f62..50552158c91 100644
--- a/test/Transforms/InstCombine/or.ll
+++ b/test/Transforms/InstCombine/or.ll
@@ -268,21 +268,6 @@ define i1 @test26(i32 %A, i32 %B) {
 ; CHECK: ret i1 
 }
 
-; PR5634
-define i1 @test27(i32* %A, i32* %B) {
-        %C1 = icmp eq i32* %A, null
-        %C2 = icmp eq i32* %B, null
-        ; (A == 0) & (A == 0)   -->   (A|B) == 0
-        %D = and i1 %C1, %C2
-        ret i1 %D
-; CHECK: @test27
-; CHECK: ptrtoint i32* %A
-; CHECK: ptrtoint i32* %B
-; CHECK: or i32 
-; CHECK: icmp eq i32 {{.*}}, 0
-; CHECK: ret i1 
-}
-
 ; PR5634
 define i1 @test28(i32 %A, i32 %B) {
         %C1 = icmp ne i32 %A, 0