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
|
; RUN: opt -S -instsimplify < %s | FileCheck %s
define i1 @test(i32 %a) {
; CHECK-LABEL: @test
; CHECK: ret i1 false
%rhs = add i32 %a, -1
%and = and i32 %a, %rhs
%res = icmp eq i32 %and, 1
ret i1 %res
}
define i1 @test2(i32 %a) {
; CHECK-LABEL: @test2
; CHECK: ret i1 false
%rhs = add i32 %a, 1
%and = and i32 %a, %rhs
%res = icmp eq i32 %and, 1
ret i1 %res
}
define i1 @test3(i32 %a) {
; CHECK-LABEL: @test3
; CHECK: ret i1 false
%rhs = add i32 %a, 7
%and = and i32 %a, %rhs
%res = icmp eq i32 %and, 1
ret i1 %res
}
@B = external global i32
declare void @llvm.assume(i1)
; Known bits without a constant
define i1 @test4(i32 %a) {
; CHECK-LABEL: @test4
; CHECK: ret i1 false
%b = load i32, i32* @B
%b.and = and i32 %b, 1
%b.cnd = icmp eq i32 %b.and, 1
call void @llvm.assume(i1 %b.cnd)
%rhs = add i32 %a, %b
%and = and i32 %a, %rhs
%res = icmp eq i32 %and, 1
ret i1 %res
}
; Negative test - even number
define i1 @test5(i32 %a) {
; CHECK-LABEL: @test5
; CHECK: ret i1 %res
%rhs = add i32 %a, 2
%and = and i32 %a, %rhs
%res = icmp eq i32 %and, 1
ret i1 %res
}
define i1 @test6(i32 %a) {
; CHECK-LABEL: @test6
; CHECK: ret i1 false
%lhs = add i32 %a, -1
%and = and i32 %lhs, %a
%res = icmp eq i32 %and, 1
ret i1 %res
}
|
