1 ; Test that the strncmp library call simplifier works correctly. 2 ; RUN: opt < %s -instcombine -S | FileCheck %s 3 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" 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 11 declare i32 @strncmp(i8*, i8*, i32) 12 13 ; strncmp("", x, n) -> -*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 19 ; CHECK: ret i32 %2 20 21 %str1 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 22 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10) 23 ret i32 %temp1 24 } 25 26 ; strncmp(x, "", n) -> *x 27 define i32 @test2(i8* %str1) { 28 ; CHECK-LABEL: @test2( 29 ; CHECK: %strcmpload = load i8, i8* %str1 30 ; CHECK: %1 = zext i8 %strcmpload to i32 31 ; CHECK: ret i32 %1 32 33 %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 34 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10) 35 ret i32 %temp1 36 } 37 38 ; strncmp(x, y, n) -> cnst 39 define i32 @test3() { 40 ; CHECK-LABEL: @test3( 41 ; CHECK: ret i32 -1 42 43 %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 44 %str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0 45 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10) 46 ret i32 %temp1 47 } 48 49 define i32 @test4() { 50 ; CHECK-LABEL: @test4( 51 ; CHECK: ret i32 1 52 53 %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 54 %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 55 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10) 56 ret i32 %temp1 57 } 58 59 define i32 @test5() { 60 ; CHECK-LABEL: @test5( 61 ; CHECK: ret i32 0 62 63 %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 64 %str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0 65 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 4) 66 ret i32 %temp1 67 } 68 69 ; strncmp(x,y,1) -> memcmp(x,y,1) 70 define i32 @test6(i8* %str1, i8* %str2) { 71 ; CHECK-LABEL: @test6( 72 ; CHECK: [[LOAD1:%[a-z]+]] = load i8, i8* %str1, align 1 73 ; CHECK: [[ZEXT1:%[a-z]+]] = zext i8 [[LOAD1]] to i32 74 ; CHECK: [[LOAD2:%[a-z]+]] = load i8, i8* %str2, align 1 75 ; CHECK: [[ZEXT2:%[a-z]+]] = zext i8 [[LOAD2]] to i32 76 ; CHECK: [[RET:%[a-z]+]] = sub nsw i32 [[ZEXT1]], [[ZEXT2]] 77 ; CHECK: ret i32 [[RET]] 78 79 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 1) 80 ret i32 %temp1 81 } 82 83 ; strncmp(x,y,0) -> 0 84 define i32 @test7(i8* %str1, i8* %str2) { 85 ; CHECK-LABEL: @test7( 86 ; CHECK: ret i32 0 87 88 %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 0) 89 ret i32 %temp1 90 } 91 92 ; strncmp(x,x,n) -> 0 93 define i32 @test8(i8* %str, i32 %n) { 94 ; CHECK-LABEL: @test8( 95 ; CHECK: ret i32 0 96 97 %temp1 = call i32 @strncmp(i8* %str, i8* %str, i32 %n) 98 ret i32 %temp1 99 } 100
