#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 const *, char *);
int /*<<< orphan*/ fread(unsigned char *, int, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
int ftell(int /*<<< orphan*/ *);
scalar_t__ malloc(int);
unsigned char *read_from_file(const char *path, unsigned long long *num_bytes) {
  FILE *f = fopen(path, "r");
  if (f == NULL) {
    *num_bytes = 0;
    return NULL;
  }
  fseek(f, 0, SEEK_END);
  int fsize = ftell(f);
  fseek(f, 0, SEEK_SET);
  unsigned char *string = (unsigned char *)malloc(fsize + 1);
  fread(string, fsize, 1, f);
  fclose(f);
  string[fsize] = 0;
  *num_bytes = fsize;
  return string;
}


x86 assembly (clang, -O0):
<read_from_file>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe85(%rip),%rsi
call   1080 <fopen@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    11a7 <read_from_file+0x47>
mov    -0x18(%rbp),%rax
movq   $0x0,(%rax)
movq   $0x0,-0x8(%rbp)
jmp    1227 <read_from_file+0xc7>
mov    -0x20(%rbp),%rdi
mov    0x2e36(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x20(%rbp),%rdi
call   1050 <ftell@plt>
mov    %eax,-0x24(%rbp)
mov    -0x20(%rbp),%rdi
mov    0x2e06(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x24(%rbp),%edi
add    $0x1,%edi
call   1060 <malloc@plt>
mov    %rax,-0x30(%rbp)
mov    -0x30(%rbp),%rdi
mov    -0x24(%rbp),%esi
mov    -0x20(%rbp),%rcx
mov    $0x1,%edx
call   1030 <fread@plt>
mov    -0x20(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x30(%rbp),%rax
movslq -0x24(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
movslq -0x24(%rbp),%rcx
mov    -0x18(%rbp),%rax
mov    %rcx,(%rax)
mov    -0x30(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_from_file>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r14
lea    0xe8e(%rip),%rsi
call   1080 <fopen@plt>
test   %rax,%rax
je     11e2 <read_from_file+0x82>
mov    %rax,%rbx
mov    0x2e62(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    %rbx,%rdi
call   1050 <ftell@plt>
mov    %eax,%r12d
mov    0x2e34(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
lea    0x1(%r12),%edi
call   1060 <malloc@plt>
mov    %rax,%r15
mov    %rax,%rdi
mov    %r12d,%esi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
movslq %r12d,%rax
movb   $0x0,(%r15,%rax,1)
jmp    11e7 <read_from_file+0x87>
xor    %eax,%eax
xor    %r15d,%r15d
mov    %rax,(%r14)
mov    %r15,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r12
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* @read_from_file(i8* %0, i64* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i64*
%6 = alloca i32*
%7 = alloca i32
%8 = alloca i8*
store i8* %0, i8** %4
store i64* %1, i64** %5
%9 = load i8*, i8** %4
%10 = call i32* @fopen(i8* %9, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %10, i32** %6
%11 = load i32*, i32** %6
%12 = icmp eq i32* %11, null
br i1 %12, label %13, label %15
13: ; preds = %2
%14 = load i64*, i64** %5
store i64 0, i64* %14
store i8* null, i8** %3
br label %42
15: ; preds = %2
%16 = load i32*, i32** %6
%17 = load i32, i32* @SEEK_END
%18 = call i32 @fseek(i32* %16, i32 0, i32 %17)
%19 = load i32*, i32** %6
%20 = call i32 @ftell(i32* %19)
store i32 %20, i32* %7
%21 = load i32*, i32** %6
%22 = load i32, i32* @SEEK_SET
%23 = call i32 @fseek(i32* %21, i32 0, i32 %22)
%24 = load i32, i32* %7
%25 = add nsw i32 %24, 1
%26 = call i64 @malloc(i32 %25)
%27 = inttoptr i64 %26 to i8*
store i8* %27, i8** %8
%28 = load i8*, i8** %8
%29 = load i32, i32* %7
%30 = load i32*, i32** %6
%31 = call i32 @fread(i8* %28, i32 %29, i32 1, i32* %30)
%32 = load i32*, i32** %6
%33 = call i32 @fclose(i32* %32)
%34 = load i8*, i8** %8
%35 = load i32, i32* %7
%36 = sext i32 %35 to i64
%37 = getelementptr inbounds i8, i8* %34, i64 %36
store i8 0, i8* %37
%38 = load i32, i32* %7
%39 = sext i32 %38 to i64
%40 = load i64*, i64** %5
store i64 %39, i64* %40
%41 = load i8*, i8** %8
store i8* %41, i8** %3
br label %42
42: ; preds = %15, %13
%43 = load i8*, i8** %3
ret i8* %43
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @read_from_file(i8* nocapture %0, i64* nocapture writeonly %1) {
%3 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%4 = icmp eq i32* %3, null
br i1 %4, label %18, label %5
5: ; preds = %2
%6 = load i32, i32* @SEEK_END
%7 = tail call i32 @fseek(i32* %3, i32 0, i32 %6)
%8 = tail call i32 @ftell(i32* %3)
%9 = load i32, i32* @SEEK_SET
%10 = tail call i32 @fseek(i32* %3, i32 0, i32 %9)
%11 = add nsw i32 %8, 1
%12 = tail call i64 @malloc(i32 %11)
%13 = inttoptr i64 %12 to i8*
%14 = tail call i32 @fread(i8* %13, i32 %8, i32 1, i32* %3)
%15 = tail call i32 @fclose(i32* %3)
%16 = sext i32 %8 to i64
%17 = getelementptr inbounds i8, i8* %13, i64 %16
store i8 0, i8* %17
br label %18
18: ; preds = %2, %5
%19 = phi i64 [ %16, %5 ], [ 0, %2 ]
%20 = phi i8* [ %13, %5 ], [ null, %2 ]
store i64 %19, i64* %1
ret i8* %20
}