#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 *, char *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
int ftell(int /*<<< orphan*/ *);
int /*<<< orphan*/ perror(char *);
int fLen2(char *fname) {
  FILE *fp;
  int len = 0;
  char ch = '\0';
  fp = fopen(fname, "r");
  if (fp == NULL) {
    perror("Error opening file");
    return (-1);
  }
  fseek(fp, 0, SEEK_END);
  len = ftell(fp);
  fclose(fp);
  return len;
}


x86 assembly (clang, -O0):
<fLen2>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
movl   $0x0,-0x1c(%rbp)
movb   $0x0,-0x1d(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe8e(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    119e <fLen2+0x4e>
lea    0xe75(%rip),%rdi
call   1070 <perror@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11cd <fLen2+0x7d>
mov    -0x18(%rbp),%rdi
mov    0x2e3f(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1050 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1040 <ftell@plt>
mov    %eax,-0x1c(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x1c(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<fLen2>:
push   %rbp
push   %rbx
push   %rax
lea    0xea6(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     1195 <fLen2+0x45>
mov    %rax,%rbx
mov    0x2e7a(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1050 <fseek@plt>
mov    %rbx,%rdi
call   1040 <ftell@plt>
mov    %eax,%ebp
mov    %rbx,%rdi
call   1030 <fclose@plt>
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret
lea    0xe66(%rip),%rdi
call   1070 <perror@plt>
mov    $0xffffffff,%eax
jmp    118e <fLen2+0x3e>

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@.str.1 = [19 x i8] c"Error opening file\00"
@SEEK_END = global i32 0
define i32 @fLen2(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32*
%5 = alloca i32
%6 = alloca i8
store i8* %0, i8** %3
store i32 0, i32* %5
store i8 0, i8* %6
%7 = load i8*, i8** %3
%8 = call i32* @fopen(i8* %7, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %8, i32** %4
%9 = load i32*, i32** %4
%10 = icmp eq i32* %9, null
br i1 %10, label %11, label %13
11: ; preds = %1
%12 = call i32 @perror(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0))
store i32 -1, i32* %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 i32 @ftell(i32* %17)
store i32 %18, i32* %5
%19 = load i32*, i32** %4
%20 = call i32 @fclose(i32* %19)
%21 = load i32, i32* %5
store i32 %21, i32* %2
br label %22
22: ; preds = %13, %11
%23 = load i32, i32* %2
ret i32 %23
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@.str.1 = [19 x i8] c"Error opening file\00"
@SEEK_END = global i32 0
define i32 @fLen2(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 %6
4: ; preds = %1
%5 = tail call i32 @perror(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 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 i32 @ftell(i32* %2)
%10 = tail call i32 @fclose(i32* %2)
br label %11
11: ; preds = %6, %4
%12 = phi i32 [ -1, %4 ], [ %9, %6 ]
ret i32 %12
}