1 ; RUN: opt < %s -instsimplify -S | FileCheck %s
2 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
3 target triple = "x86_64-unknown-linux-gnu"
5 define i64 @ptrdiff1(i8* %ptr) {
7 ; CHECK-NEXT: ret i64 42
9 %first = getelementptr inbounds i8* %ptr, i32 0
10 %last = getelementptr inbounds i8* %ptr, i32 42
11 %first.int = ptrtoint i8* %first to i64
12 %last.int = ptrtoint i8* %last to i64
13 %diff = sub i64 %last.int, %first.int
17 define i64 @ptrdiff2(i8* %ptr) {
19 ; CHECK-NEXT: ret i64 42
21 %first1 = getelementptr inbounds i8* %ptr, i32 0
22 %first2 = getelementptr inbounds i8* %first1, i32 1
23 %first3 = getelementptr inbounds i8* %first2, i32 2
24 %first4 = getelementptr inbounds i8* %first3, i32 4
25 %last1 = getelementptr inbounds i8* %first2, i32 48
26 %last2 = getelementptr inbounds i8* %last1, i32 8
27 %last3 = getelementptr inbounds i8* %last2, i32 -4
28 %last4 = getelementptr inbounds i8* %last3, i32 -4
29 %first.int = ptrtoint i8* %first4 to i64
30 %last.int = ptrtoint i8* %last4 to i64
31 %diff = sub i64 %last.int, %first.int
35 define i64 @ptrdiff3(i8* %ptr) {
36 ; Don't bother with non-inbounds GEPs.
38 ; CHECK: getelementptr
42 %first = getelementptr i8* %ptr, i32 0
43 %last = getelementptr i8* %ptr, i32 42
44 %first.int = ptrtoint i8* %first to i64
45 %last.int = ptrtoint i8* %last to i64
46 %diff = sub i64 %last.int, %first.int