1; RUN: llc -O3 < %s -aarch64-enable-atomic-cfg-tidy=0 -aarch64-enable-gep-opt=false -verify-machineinstrs | FileCheck %s
2target triple = "arm64-apple-ios"
3
4; rdar://12462006
5; CSE between "icmp reg reg" and "sub reg reg".
6; Both can be in the same basic block or in different basic blocks.
7define i8* @t1(i8* %base, i32* nocapture %offset, i32 %size) nounwind {
8entry:
9; CHECK-LABEL: t1:
10; CHECK: subs
11; CHECK-NOT: cmp
12; CHECK-NOT: sub
13; CHECK: b.ge
14; CHECK: sub
15; CHECK-NEXT: add
16; CHECK-NOT: sub
17; CHECK: ret
18 %0 = load i32, i32* %offset, align 4
19 %cmp = icmp slt i32 %0, %size
20 %s = sub nsw i32 %0, %size
21 br i1 %cmp, label %return, label %if.end
22
23if.end:
24 %sub = sub nsw i32 %0, %size
25 %s2 = sub nsw i32 %s, %size
26 %s3 = sub nsw i32 %sub, %s2
27 store i32 %s3, i32* %offset, align 4
28 %add.ptr = getelementptr inbounds i8, i8* %base, i32 %sub
29 br label %return
30
31return:
32 %retval.0 = phi i8* [ %add.ptr, %if.end ], [ null, %entry ]
33 ret i8* %retval.0
34}
35
36; CSE between "icmp reg imm" and "sub reg imm".
37define i8* @t2(i8* %base, i32* nocapture %offset) nounwind {
38entry:
39; CHECK-LABEL: t2:
40; CHECK: subs
41; CHECK-NOT: cmp
42; CHECK-NOT: sub
43; CHECK: b.lt
44; CHECK-NOT: sub
45; CHECK: ret
46 %0 = load i32, i32* %offset, align 4
47 %cmp = icmp slt i32 %0, 1
48 br i1 %cmp, label %return, label %if.end
49
50if.end:
51 %sub = sub nsw i32 %0, 1
52 store i32 %sub, i32* %offset, align 4
53 %add.ptr = getelementptr inbounds i8, i8* %base, i32 %sub
54 br label %return
55
56return:
57 %retval.0 = phi i8* [ %add.ptr, %if.end ], [ null, %entry ]
58 ret i8* %retval.0
59}
60