--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -instcombine -S -disable-i2p-p2i-opt < %s | FileCheck %s
+
+target datalayout = "e-p:64:64-p1:16:16-p2:32:32:32-p3:64:64:64"
+target triple = "x86_64-unknown-linux-gnu"
+
+; icmp (inttoptr (ptrtoint p1)), p2 --> icmp p1, p2.
+
+define i1 @func(i8* %X, i8* %Y) {
+; CHECK-LABEL: @func(
+; CHECK-NEXT: [[I:%.*]] = ptrtoint i8* [[X:%.*]] to i64
+; CHECK-NEXT: [[P:%.*]] = inttoptr i64 [[I]] to i8*
+; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[P]], [[Y:%.*]]
+; CHECK-NEXT: ret i1 [[CMP]]
+;
+ %i = ptrtoint i8* %X to i64
+ %p = inttoptr i64 %i to i8*
+ %cmp = icmp eq i8* %p, %Y
+ ret i1 %cmp
+}
+
+define i1 @func_pointer_different_types(i16* %X, i8* %Y) {
+; CHECK-LABEL: @func_pointer_different_types(
+; CHECK-NEXT: [[I:%.*]] = ptrtoint i16* [[X:%.*]] to i64
+; CHECK-NEXT: [[P:%.*]] = inttoptr i64 [[I]] to i8*
+; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[P]], [[Y:%.*]]
+; CHECK-NEXT: ret i1 [[CMP]]
+;
+ %i = ptrtoint i16* %X to i64
+ %p = inttoptr i64 %i to i8*
+ %cmp = icmp eq i8* %p, %Y
+ ret i1 %cmp
+}
+
+declare i8* @gen8ptr()
+
+define i1 @func_commutative(i16* %X) {
+; CHECK-LABEL: @func_commutative(
+; CHECK-NEXT: [[Y:%.*]] = call i8* @gen8ptr()
+; CHECK-NEXT: [[I:%.*]] = ptrtoint i16* [[X:%.*]] to i64
+; CHECK-NEXT: [[P:%.*]] = inttoptr i64 [[I]] to i8*
+; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[Y]], [[P]]
+; CHECK-NEXT: ret i1 [[CMP]]
+;
+ %Y = call i8* @gen8ptr() ; thwart complexity-based canonicalization
+ %i = ptrtoint i16* %X to i64
+ %p = inttoptr i64 %i to i8*
+ %cmp = icmp eq i8* %Y, %p
+ ret i1 %cmp
+}
+
+; Negative test - Wrong Integer type.
+
+define i1 @func_integer_type_too_small(i16* %X, i8* %Y) {
+; CHECK-LABEL: @func_integer_type_too_small(
+; CHECK-NEXT: [[TMP1:%.*]] = ptrtoint i16* [[X:%.*]] to i64
+; CHECK-NEXT: [[TMP2:%.*]] = and i64 [[TMP1]], 4294967295
+; CHECK-NEXT: [[P:%.*]] = inttoptr i64 [[TMP2]] to i8*
+; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[P]], [[Y:%.*]]
+; CHECK-NEXT: ret i1 [[CMP]]
+;
+ %i = ptrtoint i16* %X to i32
+ %p = inttoptr i32 %i to i8*
+ %cmp = icmp eq i8* %Y, %p
+ ret i1 %cmp
+}
+
+; Negative test - Pointers in different address space
+
+define i1 @func_ptr_different_addrspace(i8* %X, i16 addrspace(3)* %Y){
+; CHECK-LABEL: @func_ptr_different_addrspace(
+; CHECK-NEXT: [[I:%.*]] = ptrtoint i8* [[X:%.*]] to i64
+; CHECK-NEXT: [[P:%.*]] = inttoptr i64 [[I]] to i16 addrspace(3)*
+; CHECK-NEXT: [[CMP:%.*]] = icmp eq i16 addrspace(3)* [[P]], [[Y:%.*]]
+; CHECK-NEXT: ret i1 [[CMP]]
+;
+ %i = ptrtoint i8* %X to i64
+ %p = inttoptr i64 %i to i16 addrspace(3)*
+ %cmp = icmp eq i16 addrspace(3)* %Y, %p
+ ret i1 %cmp
+}
+
+; Negative test - Pointers in different address space
+
+define i1 @func_ptr_different_addrspace1(i8 addrspace(2)* %X, i16* %Y){
+; CHECK-LABEL: @func_ptr_different_addrspace1(
+; CHECK-NEXT: [[TMP1:%.*]] = ptrtoint i8 addrspace(2)* [[X:%.*]] to i32
+; CHECK-NEXT: [[I:%.*]] = zext i32 [[TMP1]] to i64
+; CHECK-NEXT: [[P:%.*]] = inttoptr i64 [[I]] to i16*
+; CHECK-NEXT: [[CMP:%.*]] = icmp eq i16* [[P]], [[Y:%.*]]
+; CHECK-NEXT: ret i1 [[CMP]]
+;
+ %i = ptrtoint i8 addrspace(2)* %X to i64
+ %p = inttoptr i64 %i to i16*
+ %cmp = icmp eq i16* %Y, %p
+ ret i1 %cmp
+}