1; RUN: llc < %s -mtriple=arm-apple-darwin | FileCheck %s
2
3define i32 @f(i32 %a, i32 %b) nounwind ssp {
4entry:
5; CHECK-LABEL: f:
6; CHECK: subs
7; CHECK-NOT: cmp
8  %cmp = icmp sgt i32 %a, %b
9  %sub = sub nsw i32 %a, %b
10  %sub. = select i1 %cmp, i32 %sub, i32 0
11  ret i32 %sub.
12}
13
14define i32 @g(i32 %a, i32 %b) nounwind ssp {
15entry:
16; CHECK-LABEL: g:
17; CHECK: subs
18; CHECK-NOT: cmp
19  %cmp = icmp slt i32 %a, %b
20  %sub = sub nsw i32 %b, %a
21  %sub. = select i1 %cmp, i32 %sub, i32 0
22  ret i32 %sub.
23}
24
25define i32 @h(i32 %a, i32 %b) nounwind ssp {
26entry:
27; CHECK-LABEL: h:
28; CHECK: subs
29; CHECK-NOT: cmp
30  %cmp = icmp sgt i32 %a, 3
31  %sub = sub nsw i32 %a, 3
32  %sub. = select i1 %cmp, i32 %sub, i32 %b
33  ret i32 %sub.
34}
35
36; rdar://11725965
37define i32 @i(i32 %a, i32 %b) nounwind readnone ssp {
38entry:
39; CHECK-LABEL: i:
40; CHECK: subs
41; CHECK-NOT: cmp
42  %cmp = icmp ult i32 %a, %b
43  %sub = sub i32 %b, %a
44  %sub. = select i1 %cmp, i32 %sub, i32 0
45  ret i32 %sub.
46}
47; If CPSR is live-out, we can't remove cmp if there exists
48; a swapped sub.
49define i32 @j(i32 %a, i32 %b) nounwind {
50entry:
51; CHECK-LABEL: j:
52; CHECK: sub
53; CHECK: cmp
54  %cmp = icmp eq i32 %b, %a
55  %sub = sub nsw i32 %a, %b
56  br i1 %cmp, label %if.then, label %if.else
57
58if.then:
59  %cmp2 = icmp sgt i32 %b, %a
60  %sel = select i1 %cmp2, i32 %sub, i32 %a
61  ret i32 %sel
62
63if.else:
64  ret i32 %sub
65}
66
67; If the sub/rsb instruction is predicated, we can't use the flags.
68; <rdar://problem/12263428>
69; Test case from MultiSource/Benchmarks/Ptrdist/bc/number.s
70; CHECK: bc_raise
71; CHECK: rsbeq
72; CHECK: cmp
73define i32 @bc_raise() nounwind ssp {
74entry:
75  %val.2.i = select i1 undef, i32 0, i32 undef
76  %sub.i = sub nsw i32 0, %val.2.i
77  %retval.0.i = select i1 undef, i32 %val.2.i, i32 %sub.i
78  %cmp1 = icmp eq i32 %retval.0.i, 0
79  br i1 %cmp1, label %land.lhs.true, label %if.end11
80
81land.lhs.true:                                    ; preds = %num2long.exit
82  ret i32 17
83
84if.end11:                                         ; preds = %num2long.exit
85  ret i32 23
86}
87