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
|
; This test sees if return values (and arguments) are properly removed when they
; are unused. All unused values are typed i16, so we can easily check. We also
; run instcombine to fold insert/extractvalue chains and we run dce to clean up
; any remaining dead stuff.
; RUN: opt %s -deadargelim -instcombine -dce | llvm-dis | not grep i16
define internal {i16, i32} @test(i16 %DEADARG) {
%A = insertvalue {i16,i32} undef, i16 1, 0
%B = insertvalue {i16,i32} %A, i32 1001, 1
ret {i16,i32} %B
}
define internal {i32, i16} @test2() {
%DEAD = call i16 @test4()
%A = insertvalue {i32,i16} undef, i32 1, 0
%B = insertvalue {i32,i16} %A, i16 %DEAD, 1
ret {i32,i16} %B
}
; Dead argument, used to check if the second result of test2 is dead even when
; it's used as a dead argument
define internal i32 @test3(i16 %A) {
%ret = call {i16, i32} @test( i16 %A ) ; <i32> [#uses=0]
%DEAD = extractvalue {i16, i32} %ret, 0
%LIVE = extractvalue {i16, i32} %ret, 1
ret i32 %LIVE
}
define internal i16 @test4() {
ret i16 0
}
; Multiple return values, multiple live return values
define internal {i32, i32, i16} @test5() {
%A = insertvalue {i32,i32,i16} undef, i32 1, 0
%B = insertvalue {i32,i32,i16} %A, i32 2, 1
%C = insertvalue {i32,i32,i16} %B, i16 3, 2
ret {i32, i32, i16} %C
}
; Nested return values
define internal {{i32}, {i16, i16}} @test6() {
%A = insertvalue {{i32}, {i16, i16}} undef, i32 1, 0, 0
%B = insertvalue {{i32}, {i16, i16}} %A, i16 2, 1, 0
%C = insertvalue {{i32}, {i16, i16}} %B, i16 3, 1, 1
ret {{i32}, {i16, i16}} %C
}
define i32 @main() {
%ret = call {i32, i16} @test2() ; <i32> [#uses=1]
%LIVE = extractvalue {i32, i16} %ret, 0
%DEAD = extractvalue {i32, i16} %ret, 1
%Y = add i32 %LIVE, -123 ; <i32> [#uses=1]
%LIVE2 = call i32 @test3(i16 %DEAD) ; <i32> [#uses=1]
%Z = add i32 %LIVE2, %Y ; <i32> [#uses=1]
%ret1 = call { i32, i32, i16 } @test5 ()
%LIVE3 = extractvalue { i32, i32, i16} %ret1, 0
%LIVE4 = extractvalue { i32, i32, i16} %ret1, 1
%DEAD2 = extractvalue { i32, i32, i16} %ret1, 2
%V = add i32 %LIVE3, %LIVE4
%W = add i32 %Z, %V
%ret2 = call { { i32 }, { i16, i16 } } @test6 ()
%LIVE5 = extractvalue { { i32 }, { i16, i16 } } %ret2, 0, 0
%DEAD3 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 0
%DEAD4 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 1
%Q = add i32 %W, %LIVE5
ret i32 %Q
}
|
