#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*/ SEEK_SET;
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fread(char *, int, long, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
char *malloc(long);
char *last_rom_path() {
  FILE *f = fopen("lastrom.txt", "r");
  if (f == NULL) {
    return NULL;
  }
  fseek(f, 0, SEEK_END);
  long pathlen = ftell(f);
  fseek(f, 0, SEEK_SET);
  char *path = malloc(pathlen + 1);
  fread(path, 1, pathlen, f);
  path[pathlen] = '\0';
  fclose(f);
  return path;
}


x86 assembly (clang, -O0):
<last_rom_path>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
lea    0xe91(%rip),%rdi
lea    0xe96(%rip),%rsi
call   1080 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1197 <last_rom_path+0x37>
movq   $0x0,-0x8(%rbp)
jmp    1210 <last_rom_path+0xb0>
mov    -0x10(%rbp),%rdi
mov    0x2e46(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x10(%rbp),%rdi
call   1050 <ftell@plt>
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
mov    0x2e15(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x18(%rbp),%rdi
add    $0x1,%rdi
call   1060 <malloc@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
mov    -0x18(%rbp),%rdx
mov    -0x10(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    -0x20(%rbp),%rax
mov    -0x18(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x10(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<last_rom_path>:
push   %r15
push   %r14
push   %rbx
lea    0xe94(%rip),%rdi
lea    0xe99(%rip),%rsi
call   1080 <fopen@plt>
test   %rax,%rax
je     11df <last_rom_path+0x7f>
mov    %rax,%rbx
mov    0x2e61(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    %rbx,%rdi
call   1050 <ftell@plt>
mov    %rax,%r15
mov    0x2e33(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
lea    0x1(%r15),%rdi
call   1060 <malloc@plt>
mov    %rax,%r14
mov    %rax,%rdi
mov    $0x1,%esi
mov    %r15,%rdx
mov    %rbx,%rcx
call   1030 <fread@plt>
movb   $0x0,(%r14,%r15,1)
mov    %rbx,%rdi
call   1040 <fclose@plt>
jmp    11e2 <last_rom_path+0x82>
xor    %r14d,%r14d
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [12 x i8] c"lastrom.txt\00"
@.str.1 = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @last_rom_path() {
%1 = alloca i8*
%2 = alloca i32*
%3 = alloca i64
%4 = alloca i8*
%5 = call i32* @fopen(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %5, i32** %2
%6 = load i32*, i32** %2
%7 = icmp eq i32* %6, null
br i1 %7, label %8, label %9
8: ; preds = %0
store i8* null, i8** %1
br label %31
9: ; preds = %0
%10 = load i32*, i32** %2
%11 = load i32, i32* @SEEK_END
%12 = call i32 @fseek(i32* %10, i32 0, i32 %11)
%13 = load i32*, i32** %2
%14 = call i64 @ftell(i32* %13)
store i64 %14, i64* %3
%15 = load i32*, i32** %2
%16 = load i32, i32* @SEEK_SET
%17 = call i32 @fseek(i32* %15, i32 0, i32 %16)
%18 = load i64, i64* %3
%19 = add nsw i64 %18, 1
%20 = call i8* @malloc(i64 %19)
store i8* %20, i8** %4
%21 = load i8*, i8** %4
%22 = load i64, i64* %3
%23 = load i32*, i32** %2
%24 = call i32 @fread(i8* %21, i32 1, i64 %22, i32* %23)
%25 = load i8*, i8** %4
%26 = load i64, i64* %3
%27 = getelementptr inbounds i8, i8* %25, i64 %26
store i8 0, i8* %27
%28 = load i32*, i32** %2
%29 = call i32 @fclose(i32* %28)
%30 = load i8*, i8** %4
store i8* %30, i8** %1
br label %31
31: ; preds = %9, %8
%32 = load i8*, i8** %1
ret i8* %32
}

LLVM IR (-O2):
@.str = [12 x i8] c"lastrom.txt\00"
@.str.1 = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define noalias i8* @last_rom_path() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([12 x i8], [12 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 %14, label %3
3: ; preds = %0
%4 = load i32, i32* @SEEK_END
%5 = tail call i32 @fseek(i32* %1, i32 0, i32 %4)
%6 = tail call i64 @ftell(i32* %1)
%7 = load i32, i32* @SEEK_SET
%8 = tail call i32 @fseek(i32* %1, i32 0, i32 %7)
%9 = add nsw i64 %6, 1
%10 = tail call i8* @malloc(i64 %9)
%11 = tail call i32 @fread(i8* %10, i32 1, i64 %6, i32* %1)
%12 = getelementptr inbounds i8, i8* %10, i64 %6
store i8 0, i8* %12
%13 = tail call i32 @fclose(i32* %1)
br label %14
14: ; preds = %0, %3
%15 = phi i8* [ %10, %3 ], [ null, %0 ]
ret i8* %15
}