#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*/ init();
int mystery8(char *, char *, int);
int /*<<< orphan*/ printf(char *, ...);
int main(int argc, char *argv[]) {
  if (argc != 4) {
    printf("%s <string 1> <string 2> <no of chars to compare>\n", argv[0]);
    return -1;
  }
  init();
  int n = atoi(argv[3]), c;
  c = mystery8(argv[1], argv[2], n);
  printf("diff is %d\n", c);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x4,-0x8(%rbp)
je     1181 <main+0x41>
mov    -0x10(%rbp),%rax
mov    (%rax),%rsi
lea    0xe92(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11c4 <main+0x84>
mov    $0x0,%al
call   1040 <init@plt>
mov    -0x10(%rbp),%rax
mov    0x18(%rax),%rdi
call   1060 <atoi@plt>
mov    %eax,-0x14(%rbp)
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rsi
mov    -0x14(%rbp),%edx
call   1050 <mystery8@plt>
mov    %eax,-0x18(%rbp)
mov    -0x18(%rbp),%esi
lea    0xe76(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
mov    %rsi,%rbx
cmp    $0x4,%edi
jne    117e <main+0x3e>
xor    %ebp,%ebp
xor    %eax,%eax
call   1040 <init@plt>
mov    0x18(%rbx),%rdi
call   1060 <atoi@plt>
mov    0x8(%rbx),%rdi
mov    0x10(%rbx),%rsi
mov    %eax,%edx
call   1050 <mystery8@plt>
lea    0xec0(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1030 <printf@plt>
jmp    1194 <main+0x54>
mov    (%rbx),%rsi
lea    0xe78(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    $0xffffffff,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [51 x i8] c"%s <string 1> <string 2> <no of chars to compare>\0A\00"
@.str.1 = [12 x i8] c"diff is %d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* %4
%9 = icmp ne i32 %8, 4
br i1 %9, label %10, label %15
10: ; preds = %2
%11 = load i8**, i8*** %5
%12 = getelementptr inbounds i8*, i8** %11, i64 0
%13 = load i8*, i8** %12
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([51 x i8], [51 x i8]* @.str, i64 0, i64 0), i8* %13)
store i32 -1, i32* %3
br label %31
15: ; preds = %2
%16 = call i32 (...) @init()
%17 = load i8**, i8*** %5
%18 = getelementptr inbounds i8*, i8** %17, i64 3
%19 = load i8*, i8** %18
%20 = call i32 @atoi(i8* %19)
store i32 %20, i32* %6
%21 = load i8**, i8*** %5
%22 = getelementptr inbounds i8*, i8** %21, i64 1
%23 = load i8*, i8** %22
%24 = load i8**, i8*** %5
%25 = getelementptr inbounds i8*, i8** %24, i64 2
%26 = load i8*, i8** %25
%27 = load i32, i32* %6
%28 = call i32 @mystery8(i8* %23, i8* %26, i32 %27)
store i32 %28, i32* %7
%29 = load i32, i32* %7
%30 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), i32 %29)
br label %31
31: ; preds = %15, %10
%32 = load i32, i32* %3
ret i32 %32
}

LLVM IR (-O2):
@.str = [51 x i8] c"%s <string 1> <string 2> <no of chars to compare>\0A\00"
@.str.1 = [12 x i8] c"diff is %d\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 4
br i1 %3, label %7, label %4
4: ; preds = %2
%5 = load i8*, i8** %1
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([51 x i8], [51 x i8]* @.str, i64 0, i64 0), i8* %5)
br label %18
7: ; preds = %2
%8 = tail call i32 (...) @init()
%9 = getelementptr inbounds i8*, i8** %1, i64 3
%10 = load i8*, i8** %9
%11 = tail call i32 @atoi(i8* %10)
%12 = getelementptr inbounds i8*, i8** %1, i64 1
%13 = load i8*, i8** %12
%14 = getelementptr inbounds i8*, i8** %1, i64 2
%15 = load i8*, i8** %14
%16 = tail call i32 @mystery8(i8* %13, i8* %15, i32 %11)
%17 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), i32 %16)
br label %18
18: ; preds = %7, %4
%19 = phi i32 [ -1, %4 ], [ 0, %7 ]
ret i32 %19
}