#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int atoi(char *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ printf(char *, int);
int /*<<< orphan*/ stderr;
int strncmp(char *, char *, int);
int main(int argc, char **argv) {
  char *str1, *str2;
  int length;
  if (argc != 4) {
    fprintf(stderr, "Usage: %s str1 str2 length\n", argv[0]);
    exit(1);
  }
  str1 = argv[1];
  str2 = argv[2];
  length = atoi(argv[3]);
  printf("%d\n", strncmp(str1, str2, length));
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x4,-0x8(%rbp)
je     1196 <main+0x46>
mov    0x2e69(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe79(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1070 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rax
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rax
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rax
mov    0x18(%rax),%rdi
call   1060 <atoi@plt>
mov    %eax,-0x24(%rbp)
mov    -0x18(%rbp),%rdi
mov    -0x20(%rbp),%rsi
mov    -0x24(%rbp),%edx
call   1030 <strncmp@plt>
mov    %eax,%esi
lea    0xe45(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
cmp    $0x4,%edi
jne    118f <main+0x3f>
mov    0x8(%rsi),%rbx
mov    0x10(%rsi),%r14
mov    0x18(%rsi),%rdi
call   1060 <atoi@plt>
mov    %rbx,%rdi
mov    %r14,%rsi
mov    %eax,%edx
call   1030 <strncmp@plt>
lea    0xe9e(%rip),%rdi
mov    %eax,%esi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
mov    0x2e4a(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe5e(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1070 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [28 x i8] c"Usage: %s str1 str2 length\0A\00"
@.str.1 = [4 x i8] c"%d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i8*
%7 = alloca i8*
%8 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%9 = load i32, i32* %4
%10 = icmp ne i32 %9, 4
br i1 %10, label %11, label %18
11: ; preds = %2
%12 = load i32, i32* @stderr
%13 = load i8**, i8*** %5
%14 = getelementptr inbounds i8*, i8** %13, i64 0
%15 = load i8*, i8** %14
%16 = call i32 @fprintf(i32 %12, i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0), i8* %15)
%17 = call i32 @exit(i32 1)
unreachable
18: ; preds = %2
%19 = load i8**, i8*** %5
%20 = getelementptr inbounds i8*, i8** %19, i64 1
%21 = load i8*, i8** %20
store i8* %21, i8** %6
%22 = load i8**, i8*** %5
%23 = getelementptr inbounds i8*, i8** %22, i64 2
%24 = load i8*, i8** %23
store i8* %24, i8** %7
%25 = load i8**, i8*** %5
%26 = getelementptr inbounds i8*, i8** %25, i64 3
%27 = load i8*, i8** %26
%28 = call i32 @atoi(i8* %27)
store i32 %28, i32* %8
%29 = load i8*, i8** %6
%30 = load i8*, i8** %7
%31 = load i32, i32* %8
%32 = call i32 @strncmp(i8* %29, i8* %30, i32 %31)
%33 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %32)
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [28 x i8] c"Usage: %s str1 str2 length\0A\00"
@.str.1 = [4 x i8] c"%d\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 4
br i1 %3, label %9, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0), i8* %6)
%8 = tail call i32 @exit(i32 1)
unreachable
9: ; preds = %2
%10 = getelementptr inbounds i8*, i8** %1, i64 1
%11 = load i8*, i8** %10
%12 = getelementptr inbounds i8*, i8** %1, i64 2
%13 = load i8*, i8** %12
%14 = getelementptr inbounds i8*, i8** %1, i64 3
%15 = load i8*, i8** %14
%16 = tail call i32 @atoi(i8* %15)
%17 = tail call i32 @strncmp(i8* %11, i8* %13, i32 %16)
%18 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %17)
ret i32 0
}