summaryrefslogtreecommitdiff
path: root/test/Transforms/InstCombine/sub.ll
blob: 0dd2b7d930c42a156ff9a33e24c7e09aa8325875 (plain)
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
; 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
}

int %test8(int %A) {
        %B = mul int 9, %A
        %C = sub int %B, %A      ; C = 9*A-A == A*8 == A << 3
        ret int %C
}

int %test9(int %A) {
        %B = mul int 3, %A
        %C = sub int %A, %B      ; C = A-3*A == A*-2
        ret int %C
}