#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*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char const *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, char const *);
int write_string_to_file(const char *restrict filename,
                         const char *restrict string) {
  FILE *file_stream;
  if ((file_stream = fopen(filename, "a"))) {
    fprintf(file_stream, "%s", string);
    fclose(file_stream);
    return 1;
  }
  return 0;
}


x86 assembly (clang, -O0):
<write_string_to_file>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xeb5(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x20(%rbp)
cmp    $0x0,%rax
je     1187 <write_string_to_file+0x57>
mov    -0x20(%rbp),%rdi
mov    -0x18(%rbp),%rdx
lea    0xe95(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x20(%rbp),%rdi
call   1030 <fclose@plt>
movl   $0x1,-0x4(%rbp)
jmp    118e <write_string_to_file+0x5e>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<write_string_to_file>:
push   %r14
push   %rbx
push   %rax
mov    %rsi,%r14
lea    0xec2(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     1165 <write_string_to_file+0x35>
mov    %rax,%rbx
mov    %r14,%rdi
mov    %rax,%rsi
call   1040 <fputs@plt>
mov    %rbx,%rdi
call   1030 <fclose@plt>
mov    $0x1,%eax
jmp    1167 <write_string_to_file+0x37>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [2 x i8] c"a\00"
@.str.1 = [3 x i8] c"%s\00"
define i32 @write_string_to_file(i8* noalias %0, i8* noalias %1) {
%3 = alloca i32
%4 = alloca i8*
%5 = alloca i8*
%6 = alloca i32*
store i8* %0, i8** %4
store i8* %1, i8** %5
%7 = load i8*, i8** %4
%8 = call i32* @fopen(i8* %7, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %8, i32** %6
%9 = icmp ne i32* %8, null
br i1 %9, label %10, label %16
10: ; preds = %2
%11 = load i32*, i32** %6
%12 = load i8*, i8** %5
%13 = call i32 @fprintf(i32* %11, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %12)
%14 = load i32*, i32** %6
%15 = call i32 @fclose(i32* %14)
store i32 1, i32* %3
br label %17
16: ; preds = %2
store i32 0, i32* %3
br label %17
17: ; preds = %16, %10
%18 = load i32, i32* %3
ret i32 %18
}

LLVM IR (-O2):
@.str = [2 x i8] c"a\00"
define i32 @write_string_to_file(i8* noalias nocapture %0, i8* noalias 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 %8, label %5
5: ; preds = %2
%6 = tail call i32 @fputs(i8* %1, i32* %3)
%7 = tail call i32 @fclose(i32* %3)
br label %8
8: ; preds = %2, %5
%9 = phi i32 [ 1, %5 ], [ 0, %2 ]
ret i32 %9
}