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
| ; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
| define i32 @test1(i32 %X, i8 %A) {
| %shift.upgrd.1 = zext i8 %A to i32 ; <i32> [#uses=1]
| ; can be logical shift.
| %Y = ashr i32 %X, %shift.upgrd.1 ; <i32> [#uses=1]
| %Z = and i32 %Y, 1 ; <i32> [#uses=1]
| ret i32 %Z
| ; CHECK-LABEL: @test1(
| ; CHECK: lshr i32 %X, %shift.upgrd.1
| }
|
| define i32 @test2(i8 %tmp) {
| %tmp3 = zext i8 %tmp to i32 ; <i32> [#uses=1]
| %tmp4 = add i32 %tmp3, 7 ; <i32> [#uses=1]
| %tmp5 = ashr i32 %tmp4, 3 ; <i32> [#uses=1]
| ret i32 %tmp5
| ; CHECK-LABEL: @test2(
| ; CHECK: lshr i32 %tmp4, 3
| }
|
| define i64 @test3(i1 %X, i64 %Y, i1 %Cond) {
| br i1 %Cond, label %T, label %F
| T:
| %X2 = sext i1 %X to i64
| br label %C
| F:
| %Y2 = ashr i64 %Y, 63
| br label %C
| C:
| %P = phi i64 [%X2, %T], [%Y2, %F]
| %S = ashr i64 %P, 12
| ret i64 %S
|
| ; CHECK-LABEL: @test3(
| ; CHECK: %P = phi i64
| ; CHECK-NEXT: ret i64 %P
| }
|
| define i64 @test4(i1 %X, i64 %Y, i1 %Cond) {
| br i1 %Cond, label %T, label %F
| T:
| %X2 = sext i1 %X to i64
| br label %C
| F:
| %Y2 = ashr i64 %Y, 63
| br label %C
| C:
| %P = phi i64 [%X2, %T], [%Y2, %F]
| %R = shl i64 %P, 12
| %S = ashr i64 %R, 12
| ret i64 %S
|
| ; CHECK-LABEL: @test4(
| ; CHECK: %P = phi i64
| ; CHECK-NEXT: ret i64 %P
| }
|
| ; rdar://7732987
| define i32 @test5(i32 %Y) {
| br i1 undef, label %A, label %C
| A:
| br i1 undef, label %B, label %D
| B:
| br label %D
| C:
| br i1 undef, label %D, label %E
| D:
| %P = phi i32 [0, %A], [0, %B], [%Y, %C]
| %S = ashr i32 %P, 16
| ret i32 %S
| ; CHECK-LABEL: @test5(
| ; CHECK: %P = phi i32
| ; CHECK-NEXT: ashr i32 %P, 16
| E:
| ret i32 0
| }
|
|
