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comparison test/CodeGen/ARM/sub-cmp-peephole.ll @ 0:95c75e76d11b

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children e4204d083e25
comparison
equal deleted inserted replaced
-1:000000000000 0:95c75e76d11b
1 ; RUN: llc < %s -mtriple=arm-apple-darwin | FileCheck %s
2
3 define i32 @f(i32 %a, i32 %b) nounwind ssp {
4 entry:
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
14 define i32 @g(i32 %a, i32 %b) nounwind ssp {
15 entry:
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
25 define i32 @h(i32 %a, i32 %b) nounwind ssp {
26 entry:
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
37 define i32 @i(i32 %a, i32 %b) nounwind readnone ssp {
38 entry:
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.
49 define i32 @j(i32 %a, i32 %b) nounwind {
50 entry:
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
58 if.then:
59 %cmp2 = icmp sgt i32 %b, %a
60 %sel = select i1 %cmp2, i32 %sub, i32 %a
61 ret i32 %sel
62
63 if.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
73 define i32 @bc_raise() nounwind ssp {
74 entry:
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
81 land.lhs.true: ; preds = %num2long.exit
82 ret i32 17
83
84 if.end11: ; preds = %num2long.exit
85 ret i32 23
86 }