#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*/ exit(int);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
scalar_t__ ftell(int /*<<< orphan*/ *);
int /*<<< orphan*/ perror(char *);
unsigned long fsize(char *file) {
  FILE *f = fopen(file, "r");
  if (f == NULL) {
    perror("File open failed\n");
    exit(1);
  }
  fseek(f, 0, SEEK_END);
  unsigned long len = (unsigned long)ftell(f);
  fclose(f);
  return len;
}


x86 assembly (clang, -O0):
<fsize>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xe89(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    11a1 <fsize+0x41>
lea    0xe70(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    -0x10(%rbp),%rdi
mov    0x2e3c(%rip),%rax
mov    (%rax),%edx
xor    %esi,%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):
<fsize>:
push   %r14
push   %rbx
push   %rax
lea    0xe95(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     11a9 <fsize+0x49>
mov    %rax,%rbx
mov    0x2e69(%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>
mov    %r14,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
lea    0xe52(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@.str.1 = [18 x i8] c"File open failed\0A\00"
@SEEK_END = global i32 0
define i64 @fsize(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
%7 = load i32*, i32** %3
%8 = icmp eq i32* %7, null
br i1 %8, label %9, label %12
9: ; preds = %1
%10 = call i32 @perror(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.1, i64 0, i64 0))
%11 = call i32 @exit(i32 1)
unreachable
12: ; preds = %1
%13 = load i32*, i32** %3
%14 = load i32, i32* @SEEK_END
%15 = call i32 @fseek(i32* %13, i32 0, i32 %14)
%16 = load i32*, i32** %3
%17 = call i64 @ftell(i32* %16)
store i64 %17, i64* %4
%18 = load i32*, i32** %3
%19 = call i32 @fclose(i32* %18)
%20 = load i64, i64* %4
ret i64 %20
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@.str.1 = [18 x i8] c"File open failed\0A\00"
@SEEK_END = global i32 0
define i64 @fsize(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 %4, label %7
4: ; preds = %1
%5 = tail call i32 @perror(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.1, i64 0, i64 0))
%6 = tail call i32 @exit(i32 1)
unreachable
7: ; preds = %1
%8 = load i32, i32* @SEEK_END
%9 = tail call i32 @fseek(i32* %2, i32 0, i32 %8)
%10 = tail call i64 @ftell(i32* %2)
%11 = tail call i32 @fclose(i32* %2)
ret i64 %10
}