#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 fscanf(int /*<<< orphan*/ *, char *, int *);
int read_int(const char *path) {
  FILE *fp;
  int i;
  fp = fopen(path, "r");
  if (fp == NULL)
    return -1;
  if (fscanf(fp, "%d", &i) != 1)
    i = -1;
  fclose(fp);
  return i;
}


x86 assembly (clang, -O0):
<read_int>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xeb9(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    1167 <read_int+0x37>
movl   $0xffffffff,-0x4(%rbp)
jmp    119a <read_int+0x6a>
mov    -0x18(%rbp),%rdi
lea    0xe90(%rip),%rsi
lea    -0x1c(%rbp),%rdx
call   1040 <fscanf@plt>
cmp    $0x1,%eax
je     118b <read_int+0x5b>
movl   $0xffffffff,-0x1c(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x1c(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_int>:
push   %rbx
sub    $0x10,%rsp
lea    0xec4(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     1178 <read_int+0x48>
mov    %rax,%rbx
lea    0xeb2(%rip),%rsi
lea    0xc(%rsp),%rdx
mov    %rax,%rdi
call   1040 <fscanf@plt>
cmp    $0x1,%eax
je     116a <read_int+0x3a>
movl   $0xffffffff,0xc(%rsp)
ff
mov    %rbx,%rdi
call   1030 <fclose@plt>
mov    0xc(%rsp),%eax
jmp    117d <read_int+0x4d>
mov    $0xffffffff,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@.str.1 = [3 x i8] c"%d\00"
define i32 @read_int(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32*
%5 = alloca i32
store i8* %0, i8** %3
%6 = load i8*, i8** %3
%7 = call i32* @fopen(i8* %6, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %7, i32** %4
%8 = load i32*, i32** %4
%9 = icmp eq i32* %8, null
br i1 %9, label %10, label %11
10: ; preds = %1
store i32 -1, i32* %2
br label %20
11: ; preds = %1
%12 = load i32*, i32** %4
%13 = call i32 @fscanf(i32* %12, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %5)
%14 = icmp ne i32 %13, 1
br i1 %14, label %15, label %16
15: ; preds = %11
store i32 -1, i32* %5
br label %16
16: ; preds = %15, %11
%17 = load i32*, i32** %4
%18 = call i32 @fclose(i32* %17)
%19 = load i32, i32* %5
store i32 %19, i32* %2
br label %20
20: ; preds = %16, %10
%21 = load i32, i32* %2
ret i32 %21
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@.str.1 = [3 x i8] c"%d\00"
define i32 @read_int(i8* nocapture %0) {
%2 = alloca i32
%3 = bitcast i32* %2 to i8*
%4 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%5 = icmp eq i32* %4, null
br i1 %5, label %13, label %6
6: ; preds = %1
%7 = call i32 @fscanf(i32* %4, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%8 = icmp eq i32 %7, 1
br i1 %8, label %10, label %9
9: ; preds = %6
store i32 -1, i32* %2
br label %10
10: ; preds = %9, %6
%11 = call i32 @fclose(i32* %4)
%12 = load i32, i32* %2
br label %13
13: ; preds = %1, %10
%14 = phi i32 [ %12, %10 ], [ -1, %1 ]
ret i32 %14
}