1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
; RUN: opt < %s -instsimplify -S | FileCheck %s
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"
target triple = "x86_64-unknown-linux-gnu"
define i64 @ptrdiff1(i8* %ptr) {
; CHECK: @ptrdiff1
; CHECK-NEXT: ret i64 42
%first = getelementptr inbounds i8* %ptr, i32 0
%last = getelementptr inbounds i8* %ptr, i32 42
%first.int = ptrtoint i8* %first to i64
%last.int = ptrtoint i8* %last to i64
%diff = sub i64 %last.int, %first.int
ret i64 %diff
}
define i64 @ptrdiff2(i8* %ptr) {
; CHECK: @ptrdiff2
; CHECK-NEXT: ret i64 42
%first1 = getelementptr inbounds i8* %ptr, i32 0
%first2 = getelementptr inbounds i8* %first1, i32 1
%first3 = getelementptr inbounds i8* %first2, i32 2
%first4 = getelementptr inbounds i8* %first3, i32 4
%last1 = getelementptr inbounds i8* %first2, i32 48
%last2 = getelementptr inbounds i8* %last1, i32 8
%last3 = getelementptr inbounds i8* %last2, i32 -4
%last4 = getelementptr inbounds i8* %last3, i32 -4
%first.int = ptrtoint i8* %first4 to i64
%last.int = ptrtoint i8* %last4 to i64
%diff = sub i64 %last.int, %first.int
ret i64 %diff
}
define i64 @ptrdiff3(i8* %ptr) {
; Don't bother with non-inbounds GEPs.
; CHECK: @ptrdiff3
; CHECK: getelementptr
; CHECK: sub
; CHECK: ret
%first = getelementptr i8* %ptr, i32 0
%last = getelementptr i8* %ptr, i32 42
%first.int = ptrtoint i8* %first to i64
%last.int = ptrtoint i8* %last to i64
%diff = sub i64 %last.int, %first.int
ret i64 %diff
}
define <4 x i32> @ptrdiff4(<4 x i8*> %arg) nounwind {
; Handle simple cases of vectors of pointers.
; CHECK: @ptrdiff4
; CHECK: ret <4 x i32> zeroinitializer
%p1 = ptrtoint <4 x i8*> %arg to <4 x i32>
%bc = bitcast <4 x i8*> %arg to <4 x i32*>
%p2 = ptrtoint <4 x i32*> %bc to <4 x i32>
%sub = sub <4 x i32> %p1, %p2
ret <4 x i32> %sub
}
|
