#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*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
size_t ftell(int /*<<< orphan*/ *);
int /*<<< orphan*/ printf(char *, char const *);
size_t parse_filesize(const char *filename) {
  FILE *fp;
  size_t len = 0;
  fp = fopen(filename, "rb");
  if (fp == NULL) {
    printf("Failed opening %s\n", filename);
    return 0;
  }
  fseek(fp, 0, SEEK_END);
  len = ftell(fp);
  fclose(fp);
  return len;
}


x86 assembly (clang, -O0):
<parse_filesize>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
movq   $0x0,-0x20(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe91(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11a0 <parse_filesize+0x50>
mov    -0x10(%rbp),%rsi
lea    0xe75(%rip),%rdi
call   1040 <printf@plt>
movq   $0x0,-0x8(%rbp)
jmp    11d2 <parse_filesize+0x82>
mov    -0x18(%rbp),%rdi
mov    0x2e3d(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1060 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1050 <ftell@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<parse_filesize>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
lea    0xea2(%rip),%rsi
call   1070 <fopen@plt>
test   %rax,%rax
je     1196 <parse_filesize+0x46>
mov    %rax,%rbx
mov    0x2e76(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1060 <fseek@plt>
mov    %rbx,%rdi
call   1050 <ftell@plt>
mov    %rax,%r14
mov    %rbx,%rdi
call   1030 <fclose@plt>
mov    %r14,%rax
jmp    11a7 <parse_filesize+0x57>
lea    0xe66(%rip),%rdi
mov    %r14,%rsi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [3 x i8] c"rb\00"
@.str.1 = [19 x i8] c"Failed opening %s\0A\00"
@SEEK_END = global i32 0
define i64 @parse_filesize(i8* %0) {
%2 = alloca i64
%3 = alloca i8*
%4 = alloca i32*
%5 = alloca i64
store i8* %0, i8** %3
store i64 0, i64* %5
%6 = load i8*, i8** %3
%7 = call i32* @fopen(i8* %6, i8* getelementptr inbounds ([3 x i8], [3 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 %13
10: ; preds = %1
%11 = load i8*, i8** %3
%12 = call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0), i8* %11)
store i64 0, i64* %2
br label %22
13: ; preds = %1
%14 = load i32*, i32** %4
%15 = load i32, i32* @SEEK_END
%16 = call i32 @fseek(i32* %14, i32 0, i32 %15)
%17 = load i32*, i32** %4
%18 = call i64 @ftell(i32* %17)
store i64 %18, i64* %5
%19 = load i32*, i32** %4
%20 = call i32 @fclose(i32* %19)
%21 = load i64, i64* %5
store i64 %21, i64* %2
br label %22
22: ; preds = %13, %10
%23 = load i64, i64* %2
ret i64 %23
}

LLVM IR (-O2):
@.str = [3 x i8] c"rb\00"
@.str.1 = [19 x i8] c"Failed opening %s\0A\00"
@SEEK_END = global i32 0
define i64 @parse_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 %6
4: ; preds = %1
%5 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0), i8* %0)
br label %11
6: ; preds = %1
%7 = load i32, i32* @SEEK_END
%8 = tail call i32 @fseek(i32* %2, i32 0, i32 %7)
%9 = tail call i64 @ftell(i32* %2)
%10 = tail call i32 @fclose(i32* %2)
br label %11
11: ; preds = %6, %4
%12 = phi i64 [ 0, %4 ], [ %9, %6 ]
ret i64 %12
}