#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*/ exit(int);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *);
int /*<<< orphan*/ printf(char *);
void file_write(void) {
  FILE *f = fopen("tmp", "w");
  if (f == NULL) {
    printf("IO error\n");
    exit(1);
  }
  fprintf(f, "MarcoMerli\n");
  fclose(f);
}


x86 assembly (clang, -O0):
<file_write>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xea1(%rip),%rdi
lea    0xe9e(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x8(%rbp)
cmpq   $0x0,-0x8(%rbp)
jne    1190 <file_write+0x40>
lea    0xe85(%rip),%rdi
call   1040 <printf@plt>
mov    $0x1,%edi
call   1070 <exit@plt>
mov    -0x8(%rbp),%rdi
lea    0xe75(%rip),%rsi
call   1050 <fprintf@plt>
mov    -0x8(%rbp),%rdi
call   1030 <fclose@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<file_write>:
push   %rbx
lea    0xea8(%rip),%rdi
lea    0xea5(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     118e <file_write+0x3e>
mov    %rax,%rbx
lea    0xe93(%rip),%rdi
mov    $0xb,%esi
mov    $0x1,%edx
mov    %rax,%rcx
call   1070 <fwrite@plt>
mov    %rbx,%rdi
pop    %rbx
jmp    1040 <fclose@plt>
lea    0xe7d(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@.str = [4 x i8] c"tmp\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [10 x i8] c"IO error\0A\00"
@.str.3 = [12 x i8] c"MarcoMerli\0A\00"
define void @file_write() {
%1 = alloca i32*
%2 = call i32* @fopen(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %2, i32** %1
%3 = load i32*, i32** %1
%4 = icmp eq i32* %3, null
br i1 %4, label %5, label %8
5: ; preds = %0
%6 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0))
%7 = call i32 @exit(i32 1)
unreachable
8: ; preds = %0
%9 = load i32*, i32** %1
%10 = call i32 @fprintf(i32* %9, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0))
%11 = load i32*, i32** %1
%12 = call i32 @fclose(i32* %11)
ret void
}

LLVM IR (-O2):
@.str = [4 x i8] c"tmp\00"
@.str.1 = [2 x i8] c"w\00"
@.str.3 = [12 x i8] c"MarcoMerli\0A\00"
@str = [9 x i8] c"IO error\00"
define void @file_write() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%2 = icmp eq i32* %1, null
br i1 %2, label %3, label %6
3: ; preds = %0
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @str, i64 0, i64 0))
%5 = tail call i32 @exit(i32 1)
unreachable
6: ; preds = %0
%7 = tail call i64 @fwrite(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i64 11, i64 1, i32* %1)
%8 = tail call i32 @fclose(i32* %1)
ret void
}