#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*/ *const);
int /*<<< orphan*/ *fopen(char const *const, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char const *const);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *const, int /*<<< orphan*/,
                         int /*<<< orphan*/);
int /*<<< orphan*/ ftell(int /*<<< orphan*/ *const);
int /*<<< orphan*/ stderr;
long filesize(const char *const path) {
  FILE *const f = fopen(path, "rb");
  if (0 == f) {
    fprintf(stderr, "Bad file: %s\n", path);
    exit(1);
  }
  fseek(f, 0, SEEK_END);
  const long sz = (unsigned)ftell(f);
  fclose(f);
  return sz;
}


x86 assembly (clang, -O0):
<filesize>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xe89(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x10(%rbp)
xor    %eax,%eax
cmp    -0x10(%rbp),%rax
jne    11af <filesize+0x4f>
mov    0x2e45(%rip),%rax
mov    (%rax),%edi
mov    -0x8(%rbp),%rdx
lea    0xe63(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    -0x10(%rbp),%rdi
mov    0x2e2e(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1060 <fseek@plt>
mov    -0x10(%rbp),%rdi
call   1050 <ftell@plt>
mov    %eax,%eax
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):
<filesize>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
lea    0xe92(%rip),%rsi
call   1070 <fopen@plt>
test   %rax,%rax
je     11ac <filesize+0x4c>
mov    %rax,%rbx
mov    0x2e66(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1060 <fseek@plt>
mov    %rbx,%rdi
call   1050 <ftell@plt>
mov    %eax,%r14d
mov    %rbx,%rdi
call   1030 <fclose@plt>
mov    %r14,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
mov    0x2e25(%rip),%rax
mov    (%rax),%edi
lea    0xe47(%rip),%rsi
mov    %r14,%rdx
call   1040 <fprintf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@.str = [3 x i8] c"rb\00"
@stderr = global i32 0
@.str.1 = [14 x i8] c"Bad file: %s\0A\00"
@SEEK_END = global i32 0
define i64 @filesize(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 ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
store i32* %6, i32** %3
%7 = load i32*, i32** %3
%8 = icmp eq i32* null, %7
br i1 %8, label %9, label %14
9: ; preds = %1
%10 = load i32, i32* @stderr
%11 = load i8*, i8** %2
%12 = call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %11)
%13 = call i32 @exit(i32 1)
unreachable
14: ; preds = %1
%15 = load i32*, i32** %3
%16 = load i32, i32* @SEEK_END
%17 = call i32 @fseek(i32* %15, i32 0, i32 %16)
%18 = load i32*, i32** %3
%19 = call i32 @ftell(i32* %18)
%20 = zext i32 %19 to i64
store i64 %20, i64* %4
%21 = load i32*, i32** %3
%22 = call i32 @fclose(i32* %21)
%23 = load i64, i64* %4
ret i64 %23
}

LLVM IR (-O2):
@.str = [3 x i8] c"rb\00"
@stderr = global i32 0
@.str.1 = [14 x i8] c"Bad file: %s\0A\00"
@SEEK_END = global i32 0
define i64 @filesize(i8* %0) {
%2 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %0)
%7 = tail call i32 @exit(i32 1)
unreachable
8: ; preds = %1
%9 = load i32, i32* @SEEK_END
%10 = tail call i32 @fseek(i32* %2, i32 0, i32 %9)
%11 = tail call i32 @ftell(i32* %2)
%12 = zext i32 %11 to i64
%13 = tail call i32 @fclose(i32* %2)
ret i64 %12
}