#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 */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ concate(int /*<<< orphan*/ *, int /*<<< orphan*/ *,
                           int /*<<< orphan*/ *);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int main() {
  FILE *fst = fopen("./fst.txt", "r");
  FILE *snd = fopen("./snd.txt", "r");
  FILE *out = fopen("./out.txt", "w");
  concate(fst, snd, out);
  fclose(fst);
  fclose(snd);
  fclose(out);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
lea    0xebd(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,-0x10(%rbp)
lea    0xeaf(%rip),%rdi
lea    0xea6(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,-0x18(%rbp)
lea    0xea2(%rip),%rdi
lea    0xea5(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rdi
mov    -0x18(%rbp),%rsi
mov    -0x20(%rbp),%rdx
call   1050 <concate@plt>
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x20(%rbp),%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
lea    0xec4(%rip),%rdi
lea    0xec7(%rip),%r14
mov    %r14,%rsi
call   1040 <fopen@plt>
mov    %rax,%r15
lea    0xeb7(%rip),%rdi
mov    %r14,%rsi
call   1040 <fopen@plt>
mov    %rax,%r14
lea    0xeaf(%rip),%rdi
lea    0xeb2(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,%rbx
mov    %r15,%rdi
mov    %r14,%rsi
mov    %rax,%rdx
call   1050 <concate@plt>
mov    %r15,%rdi
call   1030 <fclose@plt>
mov    %r14,%rdi
call   1030 <fclose@plt>
mov    %rbx,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [10 x i8] c"./fst.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [10 x i8] c"./snd.txt\00"
@.str.3 = [10 x i8] c"./out.txt\00"
@.str.4 = [2 x i8] c"w\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32*
%4 = alloca i32*
store i32 0, i32* %1
%5 = call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %5, i32** %2
%6 = call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %6, i32** %3
%7 = call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
store i32* %7, i32** %4
%8 = load i32*, i32** %2
%9 = load i32*, i32** %3
%10 = load i32*, i32** %4
%11 = call i32 @concate(i32* %8, i32* %9, i32* %10)
%12 = load i32*, i32** %2
%13 = call i32 @fclose(i32* %12)
%14 = load i32*, i32** %3
%15 = call i32 @fclose(i32* %14)
%16 = load i32*, i32** %4
%17 = call i32 @fclose(i32* %16)
ret i32 0
}

LLVM IR (-O2):
@.str = [10 x i8] c"./fst.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [10 x i8] c"./snd.txt\00"
@.str.3 = [10 x i8] c"./out.txt\00"
@.str.4 = [2 x i8] c"w\00"
define i32 @main() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%2 = tail call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%3 = tail call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
%4 = tail call i32 @concate(i32* %1, i32* %2, i32* %3)
%5 = tail call i32 @fclose(i32* %1)
%6 = tail call i32 @fclose(i32* %2)
%7 = tail call i32 @fclose(i32* %3)
ret i32 0
}