+; RUN: opt -S -instsimplify < %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+
+%struct.A = type { [7 x i8] }
+
+define %struct.A* @test1(%struct.A* %b, %struct.A* %e) {
+ %e_ptr = ptrtoint %struct.A* %e to i64
+ %b_ptr = ptrtoint %struct.A* %b to i64
+ %sub = sub i64 %e_ptr, %b_ptr
+ %sdiv = sdiv exact i64 %sub, 7
+ %gep = getelementptr inbounds %struct.A* %b, i64 %sdiv
+ ret %struct.A* %gep
+; CHECK-LABEL: @test1
+; CHECK-NEXT: ret %struct.A* %e
+}
+
+define i8* @test2(i8* %b, i8* %e) {
+ %e_ptr = ptrtoint i8* %e to i64
+ %b_ptr = ptrtoint i8* %b to i64
+ %sub = sub i64 %e_ptr, %b_ptr
+ %gep = getelementptr inbounds i8* %b, i64 %sub
+ ret i8* %gep
+; CHECK-LABEL: @test2
+; CHECK-NEXT: ret i8* %e
+}
+
+define i64* @test3(i64* %b, i64* %e) {
+ %e_ptr = ptrtoint i64* %e to i64
+ %b_ptr = ptrtoint i64* %b to i64
+ %sub = sub i64 %e_ptr, %b_ptr
+ %ashr = ashr exact i64 %sub, 3
+ %gep = getelementptr inbounds i64* %b, i64 %ashr
+ ret i64* %gep
+; CHECK-LABEL: @test3
+; CHECK-NEXT: ret i64* %e
+}