#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*/ fflush(int /*<<< orphan*/);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *);
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ stdout;
void turn_on_light(char *gpio_addr) {
  printf("Turning on light\n");
  fflush(stdout);
  FILE *f = fopen(gpio_addr, "w");
  if (f == NULL) {
    printf("Error accessing value\n");
    exit(1);
  } else {
    fprintf(f, "0");
  }
  fclose(f);
}


x86 assembly (clang, -O0):
<turn_on_light>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
lea    0xe8d(%rip),%rdi
call   1040 <printf@plt>
mov    0x2e61(%rip),%rax
mov    (%rax),%edi
call   1060 <fflush@plt>
mov    -0x8(%rbp),%rdi
lea    0xe81(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    11bb <turn_on_light+0x5b>
lea    0xe68(%rip),%rdi
call   1040 <printf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    -0x10(%rbp),%rdi
lea    0xe65(%rip),%rsi
call   1050 <fprintf@plt>
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<turn_on_light>:
push   %rbx
mov    %rdi,%rbx
lea    0xe97(%rip),%rdi
call   1030 <puts@plt>
mov    0x2e69(%rip),%rax
mov    (%rax),%edi
call   1060 <fflush@plt>
lea    0xe7b(%rip),%rsi
mov    %rbx,%rdi
call   1070 <fopen@plt>
test   %rax,%rax
je     11ab <turn_on_light+0x4b>
mov    %rax,%rbx
mov    $0x30,%edi
mov    %rax,%rsi
call   1050 <fputc@plt>
mov    %rbx,%rdi
pop    %rbx
jmp    1040 <fclose@plt>
lea    0xe61(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@.str = [18 x i8] c"Turning on light\0A\00"
@stdout = global i32 0
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [23 x i8] c"Error accessing value\0A\00"
@.str.3 = [2 x i8] c"0\00"
define void @turn_on_light(i8* %0) {
%2 = alloca i8*
%3 = alloca i32*
store i8* %0, i8** %2
%4 = call i32 @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%5 = load i32, i32* @stdout
%6 = call i32 @fflush(i32 %5)
%7 = load i8*, i8** %2
%8 = call i32* @fopen(i8* %7, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %8, i32** %3
%9 = load i32*, i32** %3
%10 = icmp eq i32* %9, null
br i1 %10, label %11, label %14
11: ; preds = %1
%12 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0))
%13 = call i32 @exit(i32 1)
unreachable
14: ; preds = %1
%15 = load i32*, i32** %3
%16 = call i32 @fprintf(i32* %15, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
br label %17
17: ; preds = %14
%18 = load i32*, i32** %3
%19 = call i32 @fclose(i32* %18)
ret void
}

LLVM IR (-O2):
@stdout = global i32 0
@.str.1 = [2 x i8] c"w\00"
@str = [17 x i8] c"Turning on light\00"
@str.4 = [22 x i8] c"Error accessing value\00"
define void @turn_on_light(i8* nocapture %0) {
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @str, i64 0, i64 0))
%3 = load i32, i32* @stdout
%4 = tail call i32 @fflush(i32 %3)
%5 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%6 = icmp eq i32* %5, null
br i1 %6, label %7, label %10
7: ; preds = %1
%8 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @str.4, i64 0, i64 0))
%9 = tail call i32 @exit(i32 1)
unreachable
10: ; preds = %1
%11 = tail call i32 @fputc(i32 48, i32* %5)
%12 = tail call i32 @fclose(i32* %5)
ret void
}