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
|
; This test makes sure that these instructions are properly eliminated.
;
; RUN: if as < %s | opt -instcombine -die | dis | grep sub | grep -v 'sub int %Cok, %Bok'
; RUN: then exit 1
; RUN: else exit 0
; RUN: fi
implementation
int "test1"(int %A) {
%B = sub int %A, %A ; ISA constant 0
ret int %B
}
int "test2"(int %A) {
%B = sub int %A, 0
ret int %B
}
int "test3"(int %A) {
%B = sub int 0, %A ; B = -A
%C = sub int 0, %B ; C = -B = A
ret int %C
}
int "test4"(int %A, int %x) {
%B = sub int 0, %A
%C = sub int %x, %B
ret int %C
}
int "test5"(int %A, int %Bok, int %Cok) {
%D = sub int %Bok, %Cok
%E = sub int %A, %D
ret int %E
}
int %test6(int %A, int %B) {
%C = and int %A, %B ; A - (A & B) => A & ~B
%D = sub int %A, %C
ret int %D
}
int %test7(int %A) {
%B = sub int -1, %A ; B = ~A
ret int %B
}
|
