1 ; Test that the StrCmpOptimizer works correctly
2 ; RUN: opt < %s -simplify-libcalls -S | FileCheck %s
4 target 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"
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]
11 declare i32 @strncmp(i8*, i8*, i32)
13 ; strcmp("", x) -> -*x
14 define i32 @test1(i8* %str) {
15 %temp1 = call i32 @strncmp(i8* getelementptr inbounds ([1 x i8]* @null, i32 0, i32 0), i8* %str, i32 10)
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
25 define i32 @test2(i8* %str) {
26 %temp1 = call i32 @strncmp(i8* %str, i8* getelementptr inbounds ([1 x i8]* @null, i32 0, i32 0), i32 10)
29 ; CHECK: %strcmpload = load i8* %str
30 ; CHECK: %temp1 = zext i8 %strcmpload to i32
31 ; CHECK: ret i32 %temp1
34 ; strncmp(x, y, n) -> cnst
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)
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)
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)
54 ; strncmp(x,y,1) -> memcmp(x,y,1)
55 define i32 @test6(i8* %str1, i8* %str2) {
56 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 1)
65 define i32 @test7(i8* %str1, i8* %str2) {
66 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 0)
73 define i32 @test8(i8* %str, i32 %n) {
74 %temp1 = call i32 @strncmp(i8* %str, i8* %str, i32 %n)