#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*/);
int ftell(int /*<<< orphan*/ *);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ printf(char *, int);
int main() {
  FILE *fp;
  int len;
  fp = fopen("file.txt", "r");
  if (NULL == fp) {
    perror("Error opening file");
    exit(1);
  }
  fseek(fp, 0, SEEK_END);
  len = ftell(fp);
  fclose(fp);
  printf("Total size of file.txt = %d bytes\n", len);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xe7a(%rip),%rdi
lea    0xe7c(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x10(%rbp)
xor    %eax,%eax
cmp    -0x10(%rbp),%rax
jne    11b8 <main+0x48>
lea    0xe62(%rip),%rdi
call   1080 <perror@plt>
mov    $0x1,%edi
call   1090 <exit@plt>
mov    -0x10(%rbp),%rdi
mov    0x2e25(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1060 <fseek@plt>
mov    -0x10(%rbp),%rdi
call   1050 <ftell@plt>
mov    %eax,-0x14(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x14(%rbp),%esi
lea    0xe33(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
lea    0xe86(%rip),%rdi
lea    0xe88(%rip),%rsi
call   1070 <fopen@plt>
test   %rax,%rax
je     11ca <main+0x5a>
mov    %rax,%rbx
mov    0x2e53(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1060 <fseek@plt>
mov    %rbx,%rdi
call   1050 <ftell@plt>
mov    %eax,%ebp
mov    %rbx,%rdi
call   1030 <fclose@plt>
lea    0xe64(%rip),%rdi
mov    %ebp,%esi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret
lea    0xe3a(%rip),%rdi
call   1080 <perror@plt>
mov    $0x1,%edi
call   1090 <exit@plt>

LLVM IR (-O0):
@.str = [9 x i8] c"file.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [19 x i8] c"Error opening file\00"
@SEEK_END = global i32 0
@.str.3 = [35 x i8] c"Total size of file.txt = %d bytes\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32
store i32 0, i32* %1
%4 = call i32* @fopen(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %4, i32** %2
%5 = load i32*, i32** %2
%6 = icmp eq i32* null, %5
br i1 %6, label %7, label %10
7: ; preds = %0
%8 = call i32 @perror(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%9 = call i32 @exit(i32 1)
unreachable
10: ; preds = %0
%11 = load i32*, i32** %2
%12 = load i32, i32* @SEEK_END
%13 = call i32 @fseek(i32* %11, i32 0, i32 %12)
%14 = load i32*, i32** %2
%15 = call i32 @ftell(i32* %14)
store i32 %15, i32* %3
%16 = load i32*, i32** %2
%17 = call i32 @fclose(i32* %16)
%18 = load i32, i32* %3
%19 = call i32 @printf(i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str.3, i64 0, i64 0), i32 %18)
ret i32 0
}

LLVM IR (-O2):
@.str = [9 x i8] c"file.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [19 x i8] c"Error opening file\00"
@SEEK_END = global i32 0
@.str.3 = [35 x i8] c"Total size of file.txt = %d bytes\0A\00"
define i32 @main() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%2 = icmp eq i32* %1, null
br i1 %2, label %3, label %6
3: ; preds = %0
%4 = tail call i32 @perror(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%5 = tail call i32 @exit(i32 1)
unreachable
6: ; preds = %0
%7 = load i32, i32* @SEEK_END
%8 = tail call i32 @fseek(i32* %1, i32 0, i32 %7)
%9 = tail call i32 @ftell(i32* %1)
%10 = tail call i32 @fclose(i32* %1)
%11 = tail call i32 @printf(i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str.3, i64 0, i64 0), i32 %9)
ret i32 0
}