#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*/ SEEK_END;
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char const *, char *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, long, int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
int file_size(const char *file_name) {
  FILE *fp = fopen(file_name, "r");
  long sz = -1;
  if (fp != NULL) {
    fseek(fp, 0L, SEEK_END);
    sz = ftell(fp);
    fclose(fp);
  }
  return (int)sz;
}


x86 assembly (clang, -O0):
<file_size>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xea9(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x10(%rbp)
movq   $0xffffffffffffffff,-0x18(%rbp)
ff
cmpq   $0x0,-0x10(%rbp)
je     119f <file_size+0x5f>
mov    -0x10(%rbp),%rdi
mov    0x2e6a(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
call   1050 <fseek@plt>
mov    -0x10(%rbp),%rdi
call   1040 <ftell@plt>
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<file_size>:
push   %r14
push   %rbx
push   %rax
lea    0xeb5(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     1180 <file_size+0x40>
mov    %rax,%rbx
mov    0x2e89(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1050 <fseek@plt>
mov    %rbx,%rdi
call   1040 <ftell@plt>
mov    %rax,%r14
mov    %rbx,%rdi
call   1030 <fclose@plt>
jmp    1186 <file_size+0x46>
mov    $0xffffffff,%r14d
mov    %r14d,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

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

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
define i32 @file_size(i8* nocapture %0) {
%2 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %10, label %4
4: ; preds = %1
%5 = load i32, i32* @SEEK_END
%6 = tail call i32 @fseek(i32* %2, i64 0, i32 %5)
%7 = tail call i64 @ftell(i32* %2)
%8 = tail call i32 @fclose(i32* %2)
%9 = trunc i64 %7 to i32
br label %10
10: ; preds = %4, %1
%11 = phi i32 [ %9, %4 ], [ -1, %1 ]
ret i32 %11
}