#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*/ path;

/* Variables and functions */
int /*<<< orphan*/ O_WRONLY;
int /*<<< orphan*/ close(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *);
int open(char *, int /*<<< orphan*/);
int /*<<< orphan*/ snprintf(char *, int, char *, int);
int /*<<< orphan*/ stderr;
int write(int, char const *, int);
int gpio_write(int pin, int value) {
  static const char s_values_str[] = "01";
  char path[64];
  int fd;
  snprintf(path, sizeof(path), "/sys/class/gpio/gpio%d/value", pin);
  fd = open(path, O_WRONLY);
  if (-1 == fd) {
    fprintf(stderr, "Failed to set gpio pin value!\n");
    return (-1);
  }
  if (1 != write(fd, &s_values_str[0 == value ? 0 : 1], 1)) {
    fprintf(stderr, "Failed to set gpio pin value!\n");
    return (-1);
  }
  close(fd);
  return (0);
}


x86 assembly (clang, -O0):
<gpio_write>:
push   %rbp
mov    %rsp,%rbp
sub    $0x60,%rsp
mov    %edi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
lea    -0x50(%rbp),%rdi
mov    -0x8(%rbp),%ecx
mov    $0x40,%esi
lea    0xe92(%rip),%rdx
call   1040 <snprintf@plt>
lea    -0x50(%rbp),%rdi
mov    0x2e4f(%rip),%rax
mov    (%rax),%esi
call   1070 <open@plt>
mov    %eax,-0x54(%rbp)
mov    $0xffffffff,%eax
cmp    -0x54(%rbp),%eax
jne    11ba <gpio_write+0x6a>
mov    0x2e40(%rip),%rax
mov    (%rax),%edi
lea    0xe77(%rip),%rsi
call   1060 <fprintf@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    1221 <gpio_write+0xd1>
mov    -0x54(%rbp),%edi
mov    -0xc(%rbp),%edx
xor    %ecx,%ecx
mov    $0x1,%eax
cmp    %edx,%ecx
cmove  %ecx,%eax
cltq
lea    0xe2b(%rip),%rsi
add    %rax,%rsi
mov    $0x1,%edx
call   1030 <write@plt>
mov    %eax,%ecx
mov    $0x1,%eax
cmp    %ecx,%eax
je     1212 <gpio_write+0xc2>
mov    0x2de8(%rip),%rax
mov    (%rax),%edi
lea    0xe1f(%rip),%rsi
call   1060 <fprintf@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    1221 <gpio_write+0xd1>
mov    -0x54(%rbp),%edi
call   1050 <close@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x60,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<gpio_write>:
push   %rbp
push   %rbx
sub    $0x48,%rsp
mov    %esi,%ebx
mov    %edi,%ecx
lea    0xea2(%rip),%rdx
mov    %rsp,%rbp
mov    %rbp,%rdi
mov    $0x40,%esi
call   1040 <snprintf@plt>
mov    0x2e58(%rip),%rax
mov    (%rax),%esi
mov    %rbp,%rdi
call   1070 <open@plt>
cmp    $0xffffffff,%eax
je     11b3 <gpio_write+0x63>
mov    %eax,%ebp
lea    0xe70(%rip),%rsi
cmp    $0x1,%ebx
sbb    $0xffffffffffffffff,%rsi
mov    %eax,%edi
mov    $0x1,%edx
call   1030 <write@plt>
cmp    $0x1,%eax
jne    11b3 <gpio_write+0x63>
mov    %ebp,%edi
call   1050 <close@plt>
xor    %eax,%eax
jmp    11cd <gpio_write+0x7d>
mov    0x2e26(%rip),%rax
mov    (%rax),%edi
lea    0xe5d(%rip),%rsi
call   1060 <fprintf@plt>
mov    $0xffffffff,%eax
add    $0x48,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@gpio_write.s_values_str = internal constant [3 x i8] c"01\00"
@.str = [29 x i8] c"/sys/class/gpio/gpio%d/value\00"
@O_WRONLY = global i32 0
@stderr = global i32 0
@.str.1 = [31 x i8] c"Failed to set gpio pin value!\0A\00"
define i32 @gpio_write(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca [64 x i8]
%7 = alloca i32
store i32 %0, i32* %4
store i32 %1, i32* %5
%8 = getelementptr inbounds [64 x i8], [64 x i8]* %6, i64 0, i64 0
%9 = load i32, i32* %4
%10 = call i32 @snprintf(i8* %8, i32 64, i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0), i32 %9)
%11 = getelementptr inbounds [64 x i8], [64 x i8]* %6, i64 0, i64 0
%12 = load i32, i32* @O_WRONLY
%13 = call i32 @open(i8* %11, i32 %12)
store i32 %13, i32* %7
%14 = load i32, i32* %7
%15 = icmp eq i32 -1, %14
br i1 %15, label %16, label %19
16: ; preds = %2
%17 = load i32, i32* @stderr
%18 = call i32 @fprintf(i32 %17, i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.1, i64 0, i64 0))
store i32 -1, i32* %3
br label %35
19: ; preds = %2
%20 = load i32, i32* %7
%21 = load i32, i32* %5
%22 = icmp eq i32 0, %21
%23 = zext i1 %22 to i64
%24 = select i1 %22, i32 0, i32 1
%25 = sext i32 %24 to i64
%26 = getelementptr inbounds [3 x i8], [3 x i8]* @gpio_write.s_values_str, i64 0, i64 %25
%27 = call i32 @write(i32 %20, i8* %26, i32 1)
%28 = icmp ne i32 1, %27
br i1 %28, label %29, label %32
29: ; preds = %19
%30 = load i32, i32* @stderr
%31 = call i32 @fprintf(i32 %30, i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.1, i64 0, i64 0))
store i32 -1, i32* %3
br label %35
32: ; preds = %19
%33 = load i32, i32* %7
%34 = call i32 @close(i32 %33)
store i32 0, i32* %3
br label %35
35: ; preds = %32, %29, %16
%36 = load i32, i32* %3
ret i32 %36
}

LLVM IR (-O2):
@gpio_write.s_values_str = internal constant [3 x i8] c"01\00"
@.str = [29 x i8] c"/sys/class/gpio/gpio%d/value\00"
@O_WRONLY = global i32 0
@stderr = global i32 0
@.str.1 = [31 x i8] c"Failed to set gpio pin value!\0A\00"
define i32 @gpio_write(i32 %0, i32 %1) {
%3 = alloca [64 x i8]
%4 = getelementptr inbounds [64 x i8], [64 x i8]* %3, i64 0, i64 0
%5 = call i32 @snprintf(i8* %4, i32 64, i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0), i32 %0)
%6 = load i32, i32* @O_WRONLY
%7 = call i32 @open(i8* %4, i32 %6)
%8 = icmp eq i32 %7, -1
br i1 %8, label %9, label %12
9: ; preds = %2
%10 = load i32, i32* @stderr
%11 = call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.1, i64 0, i64 0))
br label %23
12: ; preds = %2
%13 = icmp ne i32 %1, 0
%14 = zext i1 %13 to i64
%15 = getelementptr inbounds [3 x i8], [3 x i8]* @gpio_write.s_values_str, i64 0, i64 %14
%16 = call i32 @write(i32 %7, i8* %15, i32 1)
%17 = icmp eq i32 %16, 1
br i1 %17, label %21, label %18
18: ; preds = %12
%19 = load i32, i32* @stderr
%20 = call i32 @fprintf(i32 %19, i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.1, i64 0, i64 0))
br label %23
21: ; preds = %12
%22 = call i32 @close(i32 %7)
br label %23
23: ; preds = %21, %18, %9
%24 = phi i32 [ -1, %9 ], [ -1, %18 ], [ 0, %21 ]
ret i32 %24
}