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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
declare i64 @llvm.cttz.i64(i64, i1)
declare i64 @llvm.ctlz.i64(i64, i1)
declare <8 x i64> @llvm.cttz.v8i64(<8 x i64>, i1)
define i32 @test0(i64 %x) {
; CHECK-LABEL: @test0(
; CHECK-NEXT: start:
; CHECK-NEXT: [[C:%.*]] = icmp eq i64 [[X:%.*]], 0
; CHECK-NEXT: br i1 [[C]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
; CHECK: non_zero:
; CHECK-NEXT: [[CTZ:%.*]] = call i64 @llvm.cttz.i64(i64 [[X]], i1 false), !range !0
; CHECK-NEXT: [[CTZ32:%.*]] = trunc i64 [[CTZ]] to i32
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[CTZ32]], [[NON_ZERO]] ], [ 0, [[START:%.*]] ]
; CHECK-NEXT: ret i32 [[RES]]
;
start:
%c = icmp eq i64 %x, 0
br i1 %c, label %exit, label %non_zero
non_zero:
%ctz = call i64 @llvm.cttz.i64(i64 %x, i1 false)
%ctz32 = trunc i64 %ctz to i32
br label %exit
exit:
%res = phi i32 [ %ctz32, %non_zero ], [ 0, %start ]
ret i32 %res
}
define i32 @test1(i64 %x) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: start:
; CHECK-NEXT: [[C:%.*]] = icmp eq i64 [[X:%.*]], 0
; CHECK-NEXT: br i1 [[C]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
; CHECK: non_zero:
; CHECK-NEXT: [[CTZ:%.*]] = call i64 @llvm.ctlz.i64(i64 [[X]], i1 false), !range !0
; CHECK-NEXT: [[CTZ32:%.*]] = trunc i64 [[CTZ]] to i32
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[CTZ32]], [[NON_ZERO]] ], [ 0, [[START:%.*]] ]
; CHECK-NEXT: ret i32 [[RES]]
;
start:
%c = icmp eq i64 %x, 0
br i1 %c, label %exit, label %non_zero
non_zero:
%ctz = call i64 @llvm.ctlz.i64(i64 %x, i1 false)
%ctz32 = trunc i64 %ctz to i32
br label %exit
exit:
%res = phi i32 [ %ctz32, %non_zero ], [ 0, %start ]
ret i32 %res
}
define <8 x i64> @test2(<8 x i64> %x) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: start:
; CHECK-NEXT: [[A:%.*]] = icmp eq <8 x i64> [[X:%.*]], zeroinitializer
; CHECK-NEXT: [[B:%.*]] = bitcast <8 x i1> [[A]] to i8
; CHECK-NEXT: [[C:%.*]] = icmp eq i8 [[B]], 0
; CHECK-NEXT: br i1 [[C]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
; CHECK: non_zero:
; CHECK-NEXT: [[CTZ:%.*]] = call <8 x i64> @llvm.cttz.v8i64(<8 x i64> [[X]], i1 false)
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[RES:%.*]] = phi <8 x i64> [ [[CTZ]], [[NON_ZERO]] ], [ zeroinitializer, [[START:%.*]] ]
; CHECK-NEXT: ret <8 x i64> [[RES]]
;
start:
%a = icmp eq <8 x i64> %x, zeroinitializer
%b = bitcast <8 x i1> %a to i8
%c = icmp eq i8 %b, 0
br i1 %c, label %exit, label %non_zero
non_zero:
; NB: We cannot determine that vectors are known to be zero based
; on the dominating condition
%ctz = call <8 x i64> @llvm.cttz.v8i64(<8 x i64> %x, i1 false)
br label %exit
exit:
%res = phi <8 x i64> [ %ctz, %non_zero ], [ zeroinitializer, %start ]
ret <8 x i64> %res
}
|