; Test that the strcmp library call simplifier works correctly. ; RUN: opt < %s -instcombine -S | FileCheck %s 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" @hello = constant [6 x i8] c"hello\00" @hell = constant [5 x i8] c"hell\00" @bell = constant [5 x i8] c"bell\00" @null = constant [1 x i8] zeroinitializer declare i32 @strcmp(i8*, i8*) ; strcmp("", x) -> -*x define i32 @test1(i8* %str2) { ; CHECK-LABEL: @test1( ; CHECK: %strcmpload = load i8, i8* %str ; CHECK: %1 = zext i8 %strcmpload to i32 ; CHECK: %2 = sub nsw i32 0, %1 ; CHECK: ret i32 %2 %str1 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 %temp1 = call i32 @strcmp(i8* %str1, i8* %str2) ret i32 %temp1 } ; strcmp(x, "") -> *x define i32 @test2(i8* %str1) { ; CHECK-LABEL: @test2( ; CHECK: %strcmpload = load i8, i8* %str ; CHECK: %1 = zext i8 %strcmpload to i32 ; CHECK: ret i32 %1 %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 %temp1 = call i32 @strcmp(i8* %str1, i8* %str2) ret i32 %temp1 } ; strcmp(x, y) -> cnst define i32 @test3() { ; CHECK-LABEL: @test3( ; CHECK: ret i32 -1 %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 %str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0 %temp1 = call i32 @strcmp(i8* %str1, i8* %str2) ret i32 %temp1 } define i32 @test4() { ; CHECK-LABEL: @test4( ; CHECK: ret i32 1 %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 %temp1 = call i32 @strcmp(i8* %str1, i8* %str2) ret i32 %temp1 } ; strcmp(x, y) -> memcmp(x, y, ) ; (This transform is rather difficult to trigger in a useful manner) define i32 @test5(i1 %b) { ; CHECK-LABEL: @test5( ; CHECK: %memcmp = call i32 @memcmp(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @hello, i32 0, i32 0), i8* %str2, i32 5) ; CHECK: ret i32 %memcmp %str1 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0 %temp1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 %temp2 = getelementptr inbounds [5 x i8], [5 x i8]* @bell, i32 0, i32 0 %str2 = select i1 %b, i8* %temp1, i8* %temp2 %temp3 = call i32 @strcmp(i8* %str1, i8* %str2) ret i32 %temp3 } ; strcmp(x,x) -> 0 define i32 @test6(i8* %str) { ; CHECK-LABEL: @test6( ; CHECK: ret i32 0 %temp1 = call i32 @strcmp(i8* %str, i8* %str) ret i32 %temp1 }