#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 *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, int const);
int drop_cache(const int val) {
  FILE *fp;
  if ((fp = fopen("/proc/sys/vm/drop_caches", "w")) != NULL) {
    fprintf(fp, "%d\n", val);
    fclose(fp);
    return 0;
  }
  return -1;
}


x86 assembly (clang, -O0):
<drop_cache>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x8(%rbp)
lea    0xebe(%rip),%rdi
lea    0xed0(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmp    $0x0,%rax
je     1184 <drop_cache+0x54>
mov    -0x10(%rbp),%rdi
mov    -0x8(%rbp),%edx
lea    0xeb1(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
movl   $0x0,-0x4(%rbp)
jmp    118b <drop_cache+0x5b>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<drop_cache>:
push   %rbp
push   %rbx
push   %rax
mov    %edi,%ebp
lea    0xec4(%rip),%rdi
lea    0xed6(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     116d <drop_cache+0x3d>
mov    %rax,%rbx
lea    0xec4(%rip),%rsi
mov    %rax,%rdi
mov    %ebp,%edx
call   1040 <fprintf@plt>
mov    %rbx,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
jmp    1172 <drop_cache+0x42>
mov    $0xffffffff,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [25 x i8] c"/proc/sys/vm/drop_caches\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [4 x i8] c"%d\0A\00"
define i32 @drop_cache(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32*
store i32 %0, i32* %3
%5 = call i32* @fopen(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %5, i32** %4
%6 = icmp ne i32* %5, null
br i1 %6, label %7, label %13
7: ; preds = %1
%8 = load i32*, i32** %4
%9 = load i32, i32* %3
%10 = call i32 @fprintf(i32* %8, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %9)
%11 = load i32*, i32** %4
%12 = call i32 @fclose(i32* %11)
store i32 0, i32* %2
br label %14
13: ; preds = %1
store i32 -1, i32* %2
br label %14
14: ; preds = %13, %7
%15 = load i32, i32* %2
ret i32 %15
}

LLVM IR (-O2):
@.str = [25 x i8] c"/proc/sys/vm/drop_caches\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [4 x i8] c"%d\0A\00"
define i32 @drop_cache(i32 %0) {
%2 = tail call i32* @fopen(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %7, label %4
4: ; preds = %1
%5 = tail call i32 @fprintf(i32* %2, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %0)
%6 = tail call i32 @fclose(i32* %2)
br label %7
7: ; preds = %1, %4
%8 = phi i32 [ 0, %4 ], [ -1, %1 ]
ret i32 %8
}