1; Test that the strcmp library call simplifier works correctly.
2; RUN: opt < %s -instcombine -S | FileCheck %s
3
4target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
5
6@hello = constant [6 x i8] c"hello\00"
7@hell = constant [5 x i8] c"hell\00"
8@bell = constant [5 x i8] c"bell\00"
9@null = constant [1 x i8] zeroinitializer
10
11declare i32 @strcmp(i8*, i8*)
12
13; strcmp("", x) -> -*x
14define arm_aapcscc i32 @test1(i8* %str2) {
15; CHECK-LABEL: @test1(
16; CHECK: %strcmpload = load i8, i8* %str
17; CHECK: %1 = zext i8 %strcmpload to i32
18; CHECK: %2 = sub nsw i32 0, %1
19; CHECK: ret i32 %2
20
21  %str1 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
22  %temp1 = call arm_apcscc i32 @strcmp(i8* %str1, i8* %str2)
23  ret i32 %temp1
24
25}
26
27; strcmp(x, "") -> *x
28define arm_aapcscc i32 @test2(i8* %str1) {
29; CHECK-LABEL: @test2(
30; CHECK: %strcmpload = load i8, i8* %str
31; CHECK: %1 = zext i8 %strcmpload to i32
32; CHECK: ret i32 %1
33
34  %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
35  %temp1 = call arm_aapcscc i32 @strcmp(i8* %str1, i8* %str2)
36  ret i32 %temp1
37}
38
39; strcmp(x, y)  -> cnst
40define arm_aapcscc i32 @test3() {
41; CHECK-LABEL: @test3(
42; CHECK: ret i32 -1
43
44  %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
45  %str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0
46  %temp1 = call arm_aapcscc i32 @strcmp(i8* %str1, i8* %str2)
47  ret i32 %temp1
48}
49
50define arm_aapcscc i32 @test4() {
51; CHECK-LABEL: @test4(
52; CHECK: ret i32 1
53
54  %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
55  %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
56  %temp1 = call arm_aapcscc i32 @strcmp(i8* %str1, i8* %str2)
57  ret i32 %temp1
58}
59
60; strcmp(x, y)   -> memcmp(x, y, <known length>)
61; (This transform is rather difficult to trigger in a useful manner)
62define arm_aapcscc i32 @test5(i1 %b) {
63; CHECK-LABEL: @test5(
64; CHECK: %memcmp = call i32 @memcmp(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @hello, i32 0, i32 0), i8* %str2, i32 5)
65; CHECK: ret i32 %memcmp
66
67  %str1 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0
68  %temp1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
69  %temp2 = getelementptr inbounds [5 x i8], [5 x i8]* @bell, i32 0, i32 0
70  %str2 = select i1 %b, i8* %temp1, i8* %temp2
71  %temp3 = call arm_aapcscc i32 @strcmp(i8* %str1, i8* %str2)
72  ret i32 %temp3
73}
74
75; strcmp(x,x)  -> 0
76define arm_aapcscc i32 @test6(i8* %str) {
77; CHECK-LABEL: @test6(
78; CHECK: ret i32 0
79
80  %temp1 = call arm_aapcscc i32 @strcmp(i8* %str, i8* %str)
81  ret i32 %temp1
82}
83
84; strcmp("", x) -> -*x
85define arm_aapcs_vfpcc i32 @test1_vfp(i8* %str2) {
86; CHECK-LABEL: @test1_vfp(
87; CHECK: %strcmpload = load i8, i8* %str
88; CHECK: %1 = zext i8 %strcmpload to i32
89; CHECK: %2 = sub nsw i32 0, %1
90; CHECK: ret i32 %2
91
92  %str1 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
93  %temp1 = call arm_aapcs_vfpcc i32 @strcmp(i8* %str1, i8* %str2)
94  ret i32 %temp1
95
96}
97
98; strcmp(x, "") -> *x
99define arm_aapcs_vfpcc i32 @test2_vfp(i8* %str1) {
100; CHECK-LABEL: @test2_vfp(
101; CHECK: %strcmpload = load i8, i8* %str
102; CHECK: %1 = zext i8 %strcmpload to i32
103; CHECK: ret i32 %1
104
105  %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
106  %temp1 = call arm_aapcs_vfpcc i32 @strcmp(i8* %str1, i8* %str2)
107  ret i32 %temp1
108}
109
110; strcmp(x, y)  -> cnst
111define arm_aapcs_vfpcc i32 @test3_vfp() {
112; CHECK-LABEL: @test3_vfp(
113; CHECK: ret i32 -1
114
115  %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
116  %str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0
117  %temp1 = call arm_aapcs_vfpcc i32 @strcmp(i8* %str1, i8* %str2)
118  ret i32 %temp1
119}
120
121define arm_aapcs_vfpcc i32 @test4_vfp() {
122; CHECK-LABEL: @test4_vfp(
123; CHECK: ret i32 1
124
125  %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
126  %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
127  %temp1 = call arm_aapcs_vfpcc i32 @strcmp(i8* %str1, i8* %str2)
128  ret i32 %temp1
129}
130
131; strcmp(x, y)   -> memcmp(x, y, <known length>)
132; (This transform is rather difficult to trigger in a useful manner)
133define arm_aapcs_vfpcc i32 @test5_vfp(i1 %b) {
134; CHECK-LABEL: @test5_vfp(
135; CHECK: %memcmp = call i32 @memcmp(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @hello, i32 0, i32 0), i8* %str2, i32 5)
136; CHECK: ret i32 %memcmp
137
138  %str1 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0
139  %temp1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
140  %temp2 = getelementptr inbounds [5 x i8], [5 x i8]* @bell, i32 0, i32 0
141  %str2 = select i1 %b, i8* %temp1, i8* %temp2
142  %temp3 = call arm_aapcs_vfpcc i32 @strcmp(i8* %str1, i8* %str2)
143  ret i32 %temp3
144}
145
146; strcmp(x,x)  -> 0
147define arm_aapcs_vfpcc i32 @test6_vfp(i8* %str) {
148; CHECK-LABEL: @test6_vfp(
149; CHECK: ret i32 0
150
151  %temp1 = call arm_aapcs_vfpcc i32 @strcmp(i8* %str, i8* %str)
152  ret i32 %temp1
153}
154