#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*/ ulong;
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ EXIT_FAILURE;
int /*<<< orphan*/ SEEK_END;
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
int /*<<< orphan*/ ftell(int /*<<< orphan*/ *);
int /*<<< orphan*/ printf(char *);
ulong getFileSize(char *pSrcFn) {
  ulong size;
  FILE *pFile = fopen(pSrcFn, "rb");
  if (pFile == NULL) {
    printf("Failed to open input file.");
    return EXIT_FAILURE;
  }
  fseek(pFile, 0, SEEK_END);
  size = ftell(pFile);
  fclose(pFile);
  return size;
}


x86 assembly (clang, -O0):
<getFileSize>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe99(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    1198 <getFileSize+0x48>
lea    0xe81(%rip),%rdi
call   1040 <printf@plt>
mov    0x2e4a(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    11c7 <getFileSize+0x77>
mov    -0x20(%rbp),%rdi
mov    0x2e45(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1060 <fseek@plt>
mov    -0x20(%rbp),%rdi
call   1050 <ftell@plt>
mov    %eax,-0x14(%rbp)
mov    -0x20(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<getFileSize>:
push   %rbp
push   %rbx
push   %rax
lea    0xea6(%rip),%rsi
call   1070 <fopen@plt>
test   %rax,%rax
je     1190 <getFileSize+0x40>
mov    %rax,%rbx
mov    0x2e7a(%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>
mov    %ebp,%eax
jmp    11a5 <getFileSize+0x55>
lea    0xe6c(%rip),%rdi
call   1040 <printf@plt>
mov    0x2e35(%rip),%rax
mov    (%rax),%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [3 x i8] c"rb\00"
@.str.1 = [27 x i8] c"Failed to open input file.\00"
@EXIT_FAILURE = global i32 0
@SEEK_END = global i32 0
define i32 @getFileSize(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i32*
store i8* %0, i8** %3
%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** %5
%8 = load i32*, i32** %5
%9 = icmp eq i32* %8, null
br i1 %9, label %10, label %13
10: ; preds = %1
%11 = call i32 @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.1, i64 0, i64 0))
%12 = load i32, i32* @EXIT_FAILURE
store i32 %12, i32* %2
br label %22
13: ; preds = %1
%14 = load i32*, i32** %5
%15 = load i32, i32* @SEEK_END
%16 = call i32 @fseek(i32* %14, i32 0, i32 %15)
%17 = load i32*, i32** %5
%18 = call i32 @ftell(i32* %17)
store i32 %18, i32* %4
%19 = load i32*, i32** %5
%20 = call i32 @fclose(i32* %19)
%21 = load i32, i32* %4
store i32 %21, i32* %2
br label %22
22: ; preds = %13, %10
%23 = load i32, i32* %2
ret i32 %23
}

LLVM IR (-O2):
@.str = [3 x i8] c"rb\00"
@.str.1 = [27 x i8] c"Failed to open input file.\00"
@EXIT_FAILURE = global i32 0
@SEEK_END = global i32 0
define i32 @getFileSize(i8* nocapture %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 %7
4: ; preds = %1
%5 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str.1, i64 0, i64 0))
%6 = load i32, i32* @EXIT_FAILURE
br label %12
7: ; preds = %1
%8 = load i32, i32* @SEEK_END
%9 = tail call i32 @fseek(i32* %2, i32 0, i32 %8)
%10 = tail call i32 @ftell(i32* %2)
%11 = tail call i32 @fclose(i32* %2)
br label %12
12: ; preds = %7, %4
%13 = phi i32 [ %6, %4 ], [ %10, %7 ]
ret i32 %13
}