#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 const *);
int /*<<< orphan*/ printf(char *, char *);
void writeStringToFile(char *filename, const char *data) {
  FILE *file = fopen(filename, "w");
  if (file == NULL) {
    printf("Error: Unable to open file %s for writing.\n", filename);
    exit(1);
  }
  fprintf(file, "%s", data);
  fclose(file);
}


x86 assembly (clang, -O0):
<writeStringToFile>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xe95(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    1199 <writeStringToFile+0x49>
mov    -0x8(%rbp),%rsi
lea    0xe78(%rip),%rdi
call   1040 <printf@plt>
mov    $0x1,%edi
call   1070 <exit@plt>
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rdx
lea    0xe86(%rip),%rsi
call   1050 <fprintf@plt>
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<writeStringToFile>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%r15
lea    0xe9e(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     1187 <writeStringToFile+0x37>
mov    %rax,%rbx
mov    %r14,%rdi
mov    %rax,%rsi
call   1050 <fputs@plt>
mov    %rbx,%rdi
pop    %rbx
pop    %r14
pop    %r15
jmp    1030 <fclose@plt>
lea    0xe74(%rip),%rdi
mov    %r15,%rsi
call   1040 <printf@plt>
mov    $0x1,%edi
call   1070 <exit@plt>

LLVM IR (-O0):
@.str = [2 x i8] c"w\00"
@.str.1 = [44 x i8] c"Error: Unable to open file %s for writing.\0A\00"
@.str.2 = [3 x i8] c"%s\00"
define void @writeStringToFile(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i32*
store i8* %0, i8** %3
store i8* %1, i8** %4
%6 = load i8*, i8** %3
%7 = call i32* @fopen(i8* %6, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %7, i32** %5
%8 = load i32*, i32** %5
%9 = icmp eq i32* %8, null
br i1 %9, label %10, label %14
10: ; preds = %2
%11 = load i8*, i8** %3
%12 = call i32 @printf(i8* getelementptr inbounds ([44 x i8], [44 x i8]* @.str.1, i64 0, i64 0), i8* %11)
%13 = call i32 @exit(i32 1)
unreachable
14: ; preds = %2
%15 = load i32*, i32** %5
%16 = load i8*, i8** %4
%17 = call i32 @fprintf(i32* %15, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i8* %16)
%18 = load i32*, i32** %5
%19 = call i32 @fclose(i32* %18)
ret void
}

LLVM IR (-O2):
@.str = [2 x i8] c"w\00"
@.str.1 = [44 x i8] c"Error: Unable to open file %s for writing.\0A\00"
define void @writeStringToFile(i8* %0, i8* nocapture %1) {
%3 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%4 = icmp eq i32* %3, null
br i1 %4, label %5, label %8
5: ; preds = %2
%6 = tail call i32 @printf(i8* getelementptr inbounds ([44 x i8], [44 x i8]* @.str.1, i64 0, i64 0), i8* %0)
%7 = tail call i32 @exit(i32 1)
unreachable
8: ; preds = %2
%9 = tail call i32 @fputs(i8* %1, i32* %3)
%10 = tail call i32 @fclose(i32* %3)
ret void
}