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) {
6 ; CHECK-LABEL: @ptrdiff1(
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) {
18 ; CHECK-LABEL: @ptrdiff2(
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.
37 ; CHECK-LABEL: @ptrdiff3(
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
50 define <4 x i32> @ptrdiff4(<4 x i8*> %arg) nounwind {
51 ; Handle simple cases of vectors of pointers.
52 ; CHECK-LABEL: @ptrdiff4(
53 ; CHECK: ret <4 x i32> zeroinitializer
54 %p1 = ptrtoint <4 x i8*> %arg to <4 x i32>
55 %bc = bitcast <4 x i8*> %arg to <4 x i32*>
56 %p2 = ptrtoint <4 x i32*> %bc to <4 x i32>
57 %sub = sub <4 x i32> %p1, %p2
61 %struct.ham = type { i32, [2 x [2 x i32]] }
63 @global = internal global %struct.ham zeroinitializer, align 4
65 define i32 @ptrdiff5() nounwind {
67 %tmp = getelementptr inbounds %struct.ham* @global, i32 0, i32 1
68 %tmp1 = getelementptr inbounds [2 x [2 x i32]]* %tmp, i32 0, i32 0
69 %tmp2 = bitcast [2 x i32]* %tmp1 to i32*
70 %tmp3 = ptrtoint i32* %tmp2 to i32
71 %tmp4 = getelementptr inbounds %struct.ham* @global, i32 0, i32 1
72 %tmp5 = getelementptr inbounds [2 x [2 x i32]]* %tmp4, i32 0, i32 0
73 %tmp6 = ptrtoint [2 x i32]* %tmp5 to i32
74 %tmp7 = sub i32 %tmp3, %tmp6
76 ; CHECK-LABEL: @ptrdiff5(