1; RUN: llc -mtriple=arm-eabi -mattr=+v4t %s -o - | FileCheck %s
2
3;; Integer absolute value, should produce something as good as: ARM:
4;;   movs r0, r0
5;;   rsbmi r0, r0, #0
6;;   bx lr
7
8define i32 @test(i32 %a) {
9        %tmp1neg = sub i32 0, %a
10        %b = icmp sgt i32 %a, -1
11        %abs = select i1 %b, i32 %a, i32 %tmp1neg
12        ret i32 %abs
13; CHECK:  cmp
14; CHECK:  rsbmi r0, r0, #0
15; CHECK:  bx lr
16}
17
18; rdar://11633193
19;; 3 instructions will be generated for abs(a-b):
20;;   subs
21;;   rsbmi
22;;   bx
23define i32 @test2(i32 %a, i32 %b) nounwind readnone ssp {
24entry:
25; CHECK: test2
26; CHECK: subs
27; CHECK-NEXT: rsbmi
28; CHECK-NEXT: bx
29  %sub = sub nsw i32 %a, %b
30  %cmp = icmp sgt i32 %sub, -1
31  %sub1 = sub nsw i32 0, %sub
32  %cond = select i1 %cmp, i32 %sub, i32 %sub1
33  ret i32 %cond
34}
35
36define i64 @test3(i64 %a) {
37; CHECK-LABEL: test3:
38; CHECK:       @ %bb.0:
39; CHECK-NEXT:    eor r0, r0, r1, asr #31
40; CHECK-NEXT:    eor r2, r1, r1, asr #31
41; CHECK-NEXT:    subs r0, r0, r1, asr #31
42; CHECK-NEXT:    sbc r1, r2, r1, asr #31
43; CHECK-NEXT:    bx lr
44  %tmp1neg = sub i64 0, %a
45  %b = icmp sgt i64 %a, -1
46  %abs = select i1 %b, i64 %a, i64 %tmp1neg
47  ret i64 %abs
48}
49