1 ; Test that the strcmp library call simplifier works correctly.
2 ; RUN: opt < %s -instcombine -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"
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
11 declare i32 @strcmp(i8*, i8*)
13 ; strcmp("", x) -> -*x
14 define 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
21 %str1 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
22 %temp1 = call i32 @strcmp(i8* %str1, i8* %str2)
28 define i32 @test2(i8* %str1) {
29 ; CHECK-LABEL: @test2(
30 ; CHECK: %strcmpload = load i8, i8* %str
31 ; CHECK: %1 = zext i8 %strcmpload to i32
34 %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
35 %temp1 = call i32 @strcmp(i8* %str1, i8* %str2)
39 ; strcmp(x, y) -> cnst
41 ; CHECK-LABEL: @test3(
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 i32 @strcmp(i8* %str1, i8* %str2)
51 ; CHECK-LABEL: @test4(
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 i32 @strcmp(i8* %str1, i8* %str2)
60 ; strcmp(x, y) -> memcmp(x, y, <known length>)
61 ; (This transform is rather difficult to trigger in a useful manner)
62 define i32 @test5(i1 %b) {
63 ; CHECK-LABEL: @test5(
64 ; CHECK: %memcmp = call i32 @memcmp(i8* getelementptr inbounds ([6 x i8]* @hello, i32 0, i32 0), i8* %str2, i32 5)
65 ; CHECK: ret i32 %memcmp
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 i32 @strcmp(i8* %str1, i8* %str2)
76 define i32 @test6(i8* %str) {
77 ; CHECK-LABEL: @test6(
80 %temp1 = call i32 @strcmp(i8* %str, i8* %str)