1; Test that the StrCmpOptimizer works correctly
2; RUN: opt < %s -simplify-libcalls -S | FileCheck %s
3
4target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
5
6@hello = constant [6 x i8] c"hello\00"		; <[6 x i8]*> [#uses=1]
7@hell = constant [5 x i8] c"hell\00"		; <[5 x i8]*> [#uses=1]
8@bell = constant [5 x i8] c"bell\00"		; <[5 x i8]*> [#uses=1]
9@null = constant [1 x i8] zeroinitializer		; <[1 x i8]*> [#uses=1]
10
11declare i32 @strncmp(i8*, i8*, i32)
12
13; strcmp("", x) -> -*x
14define i32 @test1(i8* %str) {
15  %temp1 = call i32 @strncmp(i8* getelementptr inbounds ([1 x i8]* @null, i32 0, i32 0), i8* %str, i32 10)
16  ret i32 %temp1
17  ; CHECK: @test1
18  ; CHECK: %strcmpload = load i8* %str
19  ; CHECK: %1 = zext i8 %strcmpload to i32
20  ; CHECK: %temp1 = sub i32 0, %1
21  ; CHECK: ret i32 %temp1
22}
23
24; strcmp(x, "") -> *x
25define i32 @test2(i8* %str) {
26  %temp1 = call i32 @strncmp(i8* %str, i8* getelementptr inbounds ([1 x i8]* @null, i32 0, i32 0), i32 10)
27  ret i32 %temp1
28  ; CHECK: @test2
29  ; CHECK: %strcmpload = load i8* %str
30  ; CHECK: %temp1 = zext i8 %strcmpload to i32
31  ; CHECK: ret i32 %temp1
32}
33
34; strncmp(x, y, n)  -> cnst
35define i32 @test3() {
36  %temp1 = call i32 @strncmp(i8* getelementptr inbounds ([5 x i8]* @hell, i32 0, i32 0), i8* getelementptr inbounds ([6 x i8]* @hello, i32 0, i32 0), i32 10)
37  ret i32 %temp1
38  ; CHECK: @test3
39  ; CHECK: ret i32 -1
40}
41define i32 @test4() {
42  %temp1 = call i32 @strncmp(i8* getelementptr inbounds ([5 x i8]* @hell, i32 0, i32 0), i8* getelementptr inbounds ([1 x i8]* @null, i32 0, i32 0), i32 10)
43  ret i32 %temp1
44  ; CHECK: @test4
45  ; CHECK: ret i32 1
46}
47define i32 @test5() {
48  %temp1 = call i32 @strncmp(i8* getelementptr inbounds ([5 x i8]* @hell, i32 0, i32 0), i8* getelementptr inbounds ([6 x i8]* @hello, i32 0, i32 0), i32 4)
49  ret i32 %temp1
50  ; CHECK: @test5
51  ; CHECK: ret i32 0
52}
53
54; strncmp(x,y,1) -> memcmp(x,y,1)
55define i32 @test6(i8* %str1, i8* %str2) {
56  %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 1)
57  ret i32 %temp1
58  ; CHECK: @test6
59  ; CHECK: load i8*
60  ; CHECK: load i8*
61  ; CHECK: sub i32
62}
63
64; strncmp(x,y,0)   -> 0
65define i32 @test7(i8* %str1, i8* %str2) {
66  %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 0)
67  ret i32 %temp1
68  ; CHECK: @test7
69  ; CHECK: ret i32 0
70}
71
72; strncmp(x,x,n)  -> 0
73define i32 @test8(i8* %str, i32 %n) {
74  %temp1 = call i32 @strncmp(i8* %str, i8* %str, i32 %n)
75  ret i32 %temp1
76  ; CHECK: @test8
77  ; CHECK: ret i32 0
78}
79