; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instsimplify -S | FileCheck %s

@g = external global i16, align 1
@g2 = external global i16, align 1

define i64 @ptrdiff1() {
; CHECK-LABEL: @ptrdiff1(
; CHECK-NEXT:    ret i64 sub (i64 ptrtoint (ptr @g to i64), i64 ptrtoint (ptr @g2 to i64))
;
  %i = ptrtoint ptr @g to i64
  %i2 = ptrtoint ptr @g2 to i64
  %diff = sub i64 %i, %i2
  %r = freeze i64 %diff
  ret i64 %r
}

define i64 @ptrdiff2() {
; CHECK-LABEL: @ptrdiff2(
; CHECK-NEXT:    ret i64 -2
;
  %i = ptrtoint ptr @g to i64
  %gep = getelementptr i16, ptr @g, i64 1
  %i2 = ptrtoint ptr %gep to i64
  %diff = sub i64 %i, %i2
  %r = freeze i64 %diff
  ret i64 %r
}