#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 *, char *);
int /*<<< orphan*/ fwrite(char *, int, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ stderr;
void writefile(char *data, int len, char *filename) {
  FILE *fp;
  fp = fopen(filename, "w");
  if (fp == NULL) {
    fprintf(stderr, "Can't open output file %s!\n", filename);
    exit(1);
  }
  fwrite(data, len, sizeof(char), fp);
  fclose(fp);
}


x86 assembly (clang, -O0):
<writefile>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    %rdx,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
lea    0xe92(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    11a5 <writefile+0x55>
mov    0x2e57(%rip),%rax
mov    (%rax),%edi
mov    -0x18(%rbp),%rdx
lea    0xe6c(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
mov    -0x8(%rbp),%rdi
mov    -0xc(%rbp),%esi
mov    -0x20(%rbp),%rcx
mov    $0x1,%edx
call   1070 <fwrite@plt>
mov    -0x20(%rbp),%rdi
call   1030 <fclose@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<writefile>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %rdx,%r14
mov    %esi,%r15d
mov    %rdi,%rbx
lea    0xe99(%rip),%rsi
mov    %rdx,%rdi
call   1050 <fopen@plt>
test   %rax,%rax
je     119c <writefile+0x4c>
mov    %rax,%rbp
mov    %rbx,%rdi
mov    %r15d,%esi
mov    $0x1,%edx
mov    %rax,%rcx
call   1070 <fwrite@plt>
mov    %rbp,%rdi
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
jmp    1030 <fclose@plt>
mov    0x2e3d(%rip),%rax
mov    (%rax),%edi
lea    0xe56(%rip),%rsi
mov    %r14,%rdx
call   1040 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@.str = [2 x i8] c"w\00"
@stderr = global i32 0
@.str.1 = [28 x i8] c"Can't open output file %s!\0A\00"
define void @writefile(i8* %0, i32 %1, i8* %2) {
%4 = alloca i8*
%5 = alloca i32
%6 = alloca i8*
%7 = alloca i32*
store i8* %0, i8** %4
store i32 %1, i32* %5
store i8* %2, i8** %6
%8 = load i8*, i8** %6
%9 = call i32* @fopen(i8* %8, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %9, i32** %7
%10 = load i32*, i32** %7
%11 = icmp eq i32* %10, null
br i1 %11, label %12, label %17
12: ; preds = %3
%13 = load i32, i32* @stderr
%14 = load i8*, i8** %6
%15 = call i32 @fprintf(i32 %13, i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0), i8* %14)
%16 = call i32 @exit(i32 1)
unreachable
17: ; preds = %3
%18 = load i8*, i8** %4
%19 = load i32, i32* %5
%20 = load i32*, i32** %7
%21 = call i32 @fwrite(i8* %18, i32 %19, i32 1, i32* %20)
%22 = load i32*, i32** %7
%23 = call i32 @fclose(i32* %22)
ret void
}

LLVM IR (-O2):
@.str = [2 x i8] c"w\00"
@stderr = global i32 0
@.str.1 = [28 x i8] c"Can't open output file %s!\0A\00"
define void @writefile(i8* nocapture %0, i32 %1, i8* %2) {
%4 = tail call i32* @fopen(i8* %2, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%5 = icmp eq i32* %4, null
br i1 %5, label %6, label %10
6: ; preds = %3
%7 = load i32, i32* @stderr
%8 = tail call i32 @fprintf(i32 %7, i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0), i8* %2)
%9 = tail call i32 @exit(i32 1)
unreachable
10: ; preds = %3
%11 = tail call i32 @fwrite(i8* %0, i32 %1, i32 1, i32* %4)
%12 = tail call i32 @fclose(i32* %4)
ret void
}