#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 scalar_t__ off_t;
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ SEEK_END;
int /*<<< orphan*/ SEEK_SET;
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char const *, char *);
size_t fread(char *, int, scalar_t__, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
scalar_t__ ftell(int /*<<< orphan*/ *);
char *malloc(scalar_t__);
char *realloc(char *, size_t);
char *load_file(const char *path) {
  FILE *f = fopen(path, "r");
  char *ptr, *new_ptr;
  off_t sz;
  size_t actual;
  if (!f)
    return NULL;
  fseek(f, 0, SEEK_END);
  sz = ftell(f);
  fseek(f, 0, SEEK_SET);
  ptr = malloc(sz + 1);
  if (!ptr) {
    fclose(f);
    return NULL;
  }
  actual = fread(ptr, 1, sz, f);
  fclose(f);
  ptr[actual] = 0;
  new_ptr = realloc(ptr, actual + 1);
  if (new_ptr)
    return new_ptr;
  else
    return ptr;
}


x86 assembly (clang, -O0):
<load_file>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe79(%rip),%rsi
call   1090 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11a8 <load_file+0x38>
movq   $0x0,-0x8(%rbp)
jmp    1273 <load_file+0x103>
mov    -0x18(%rbp),%rdi
mov    0x2e35(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1050 <ftell@plt>
mov    %rax,-0x30(%rbp)
mov    -0x18(%rbp),%rdi
mov    0x2e04(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x30(%rbp),%rdi
add    $0x1,%rdi
call   1060 <malloc@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    120f <load_file+0x9f>
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
movq   $0x0,-0x8(%rbp)
jmp    1273 <load_file+0x103>
mov    -0x20(%rbp),%rdi
mov    -0x30(%rbp),%rdx
mov    -0x18(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    %rax,-0x38(%rbp)
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x20(%rbp),%rax
mov    -0x38(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x20(%rbp),%rdi
mov    -0x38(%rbp),%rsi
add    $0x1,%rsi
call   1080 <realloc@plt>
mov    %rax,-0x28(%rbp)
cmpq   $0x0,-0x28(%rbp)
je     126b <load_file+0xfb>
mov    -0x28(%rbp),%rax
mov    %rax,-0x8(%rbp)
jmp    1273 <load_file+0x103>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<load_file>:
push   %r15
push   %r14
push   %rbx
lea    0xe84(%rip),%rsi
call   1090 <fopen@plt>
test   %rax,%rax
je     1212 <load_file+0xa2>
mov    %rax,%rbx
mov    0x2e54(%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    0x2e26(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
lea    0x1(%r15),%rdi
call   1060 <malloc@plt>
test   %rax,%rax
je     120a <load_file+0x9a>
mov    %rax,%r14
mov    %rax,%rdi
mov    $0x1,%esi
mov    %r15,%rdx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rax,%r15
mov    %rbx,%rdi
call   1040 <fclose@plt>
movb   $0x0,(%r14,%r15,1)
add    $0x1,%r15
mov    %r14,%rdi
mov    %r15,%rsi
call   1080 <realloc@plt>
test   %rax,%rax
cmove  %r14,%rax
jmp    1214 <load_file+0xa4>
mov    %rbx,%rdi
call   1040 <fclose@plt>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @load_file(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i32*
%5 = alloca i8*
%6 = alloca i8*
%7 = alloca i64
%8 = alloca i64
store i8* %0, i8** %3
%9 = load i8*, i8** %3
%10 = call i32* @fopen(i8* %9, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %10, i32** %4
%11 = load i32*, i32** %4
%12 = icmp ne i32* %11, null
br i1 %12, label %14, label %13
13: ; preds = %1
store i8* null, i8** %2
br label %51
14: ; preds = %1
%15 = load i32*, i32** %4
%16 = load i32, i32* @SEEK_END
%17 = call i32 @fseek(i32* %15, i32 0, i32 %16)
%18 = load i32*, i32** %4
%19 = call i64 @ftell(i32* %18)
store i64 %19, i64* %7
%20 = load i32*, i32** %4
%21 = load i32, i32* @SEEK_SET
%22 = call i32 @fseek(i32* %20, i32 0, i32 %21)
%23 = load i64, i64* %7
%24 = add nsw i64 %23, 1
%25 = call i8* @malloc(i64 %24)
store i8* %25, i8** %5
%26 = load i8*, i8** %5
%27 = icmp ne i8* %26, null
br i1 %27, label %31, label %28
28: ; preds = %14
%29 = load i32*, i32** %4
%30 = call i32 @fclose(i32* %29)
store i8* null, i8** %2
br label %51
31: ; preds = %14
%32 = load i8*, i8** %5
%33 = load i64, i64* %7
%34 = load i32*, i32** %4
%35 = call i64 @fread(i8* %32, i32 1, i64 %33, i32* %34)
store i64 %35, i64* %8
%36 = load i32*, i32** %4
%37 = call i32 @fclose(i32* %36)
%38 = load i8*, i8** %5
%39 = load i64, i64* %8
%40 = getelementptr inbounds i8, i8* %38, i64 %39
store i8 0, i8* %40
%41 = load i8*, i8** %5
%42 = load i64, i64* %8
%43 = add i64 %42, 1
%44 = call i8* @realloc(i8* %41, i64 %43)
store i8* %44, i8** %6
%45 = load i8*, i8** %6
%46 = icmp ne i8* %45, null
br i1 %46, label %47, label %49
47: ; preds = %31
%48 = load i8*, i8** %6
store i8* %48, i8** %2
br label %51
49: ; preds = %31
%50 = load i8*, i8** %5
store i8* %50, i8** %2
br label %51
51: ; preds = %49, %47, %28, %13
%52 = load i8*, i8** %2
ret i8* %52
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define noalias i8* @load_file(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 %23, label %4
4: ; preds = %1
%5 = load i32, i32* @SEEK_END
%6 = tail call i32 @fseek(i32* %2, i32 0, i32 %5)
%7 = tail call i64 @ftell(i32* %2)
%8 = load i32, i32* @SEEK_SET
%9 = tail call i32 @fseek(i32* %2, i32 0, i32 %8)
%10 = add nsw i64 %7, 1
%11 = tail call i8* @malloc(i64 %10)
%12 = icmp eq i8* %11, null
br i1 %12, label %13, label %15
13: ; preds = %4
%14 = tail call i32 @fclose(i32* %2)
br label %23
15: ; preds = %4
%16 = tail call i64 @fread(i8* %11, i32 1, i64 %7, i32* %2)
%17 = tail call i32 @fclose(i32* %2)
%18 = getelementptr inbounds i8, i8* %11, i64 %16
store i8 0, i8* %18
%19 = add i64 %16, 1
%20 = tail call i8* @realloc(i8* %11, i64 %19)
%21 = icmp eq i8* %20, null
%22 = select i1 %21, i8* %11, i8* %20
br label %23
23: ; preds = %15, %1, %13
%24 = phi i8* [ null, %13 ], [ null, %1 ], [ %22, %15 ]
ret i8* %24
}