#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 fscanf(int /*<<< orphan*/ *, char *, int *);
int mem_total() {
  FILE *file;
  int ret;
  int total;
  file = fopen("/proc/meminfo", "r");
  if (file == NULL)
    return -1;
  ret = fscanf(file, "MemTotal: %d kB", &total);
  fclose(file);
  if (ret != 1)
    return -1;
  return total;
}


x86 assembly (clang, -O0):
<mem_total>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
lea    0xec1(%rip),%rdi
lea    0xec8(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1166 <mem_total+0x36>
movl   $0xffffffff,-0x4(%rbp)
jmp    11a2 <mem_total+0x72>
mov    -0x10(%rbp),%rdi
lea    0xe9f(%rip),%rsi
lea    -0x18(%rbp),%rdx
call   1040 <fscanf@plt>
mov    %eax,-0x14(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
cmpl   $0x1,-0x14(%rbp)
je     119c <mem_total+0x6c>
movl   $0xffffffff,-0x4(%rbp)
jmp    11a2 <mem_total+0x72>
mov    -0x18(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<mem_total>:
push   %rbp
push   %rbx
push   %rax
lea    0xec6(%rip),%rdi
lea    0xecd(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     117c <mem_total+0x4c>
mov    %rax,%rbx
lea    0xebb(%rip),%rsi
lea    0x4(%rsp),%rdx
mov    %rax,%rdi
call   1040 <fscanf@plt>
mov    %eax,%ebp
mov    %rbx,%rdi
call   1030 <fclose@plt>
mov    $0xffffffff,%eax
cmp    $0x1,%ebp
jne    1181 <mem_total+0x51>
mov    0x4(%rsp),%eax
jmp    1181 <mem_total+0x51>
mov    $0xffffffff,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [14 x i8] c"/proc/meminfo\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [16 x i8] c"MemTotal: %d kB\00"
define i32 @mem_total() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32
%4 = alloca i32
%5 = call i32* @fopen(i8* getelementptr inbounds ([14 x i8], [14 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** %2
%6 = load i32*, i32** %2
%7 = icmp eq i32* %6, null
br i1 %7, label %8, label %9
8: ; preds = %0
store i32 -1, i32* %1
br label %19
9: ; preds = %0
%10 = load i32*, i32** %2
%11 = call i32 @fscanf(i32* %10, i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0), i32* %4)
store i32 %11, i32* %3
%12 = load i32*, i32** %2
%13 = call i32 @fclose(i32* %12)
%14 = load i32, i32* %3
%15 = icmp ne i32 %14, 1
br i1 %15, label %16, label %17
16: ; preds = %9
store i32 -1, i32* %1
br label %19
17: ; preds = %9
%18 = load i32, i32* %4
store i32 %18, i32* %1
br label %19
19: ; preds = %17, %16, %8
%20 = load i32, i32* %1
ret i32 %20
}

LLVM IR (-O2):
@.str = [14 x i8] c"/proc/meminfo\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [16 x i8] c"MemTotal: %d kB\00"
define i32 @mem_total() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32* @fopen(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%4 = icmp eq i32* %3, null
br i1 %4, label %11, label %5
5: ; preds = %0
%6 = call i32 @fscanf(i32* %3, i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0), i32* %1)
%7 = call i32 @fclose(i32* %3)
%8 = icmp eq i32 %6, 1
%9 = load i32, i32* %1
%10 = select i1 %8, i32 %9, i32 -1
br label %11
11: ; preds = %5, %0
%12 = phi i32 [ -1, %0 ], [ %10, %5 ]
ret i32 %12
}