#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 const *, char *);
int fread(void *, size_t, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ free(void *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
size_t ftell(int /*<<< orphan*/ *);
void *malloc(size_t);
int /*<<< orphan*/ rewind(int /*<<< orphan*/ *);
void *read_file(const char *path) {
  FILE *fd;
  size_t sz;
  void *ptr;
  fd = fopen(path, "rb");
  if (!fd)
    return 0;
  fseek(fd, 0, SEEK_END);
  sz = ftell(fd);
  rewind(fd);
  ptr = malloc(sz);
  if (fread(ptr, sz, 1, fd) != 1) {
    free(ptr);
    fclose(fd);
    return 0;
  }
  fclose(fd);
  return ptr;
}


x86 assembly (clang, -O0):
<read_file>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe69(%rip),%rsi
call   10a0 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11b8 <read_file+0x38>
movq   $0x0,-0x8(%rbp)
jmp    123e <read_file+0xbe>
mov    -0x18(%rbp),%rdi
mov    0x2e25(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1090 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1070 <ftell@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
call   1060 <rewind@plt>
mov    -0x20(%rbp),%rdi
call   1080 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x20(%rbp),%rsi
mov    -0x18(%rbp),%rcx
mov    $0x1,%edx
call   1040 <fread@plt>
cmp    $0x1,%eax
je     122d <read_file+0xad>
mov    -0x28(%rbp),%rdi
call   1030 <free@plt>
mov    -0x18(%rbp),%rdi
call   1050 <fclose@plt>
movq   $0x0,-0x8(%rbp)
jmp    123e <read_file+0xbe>
mov    -0x18(%rbp),%rdi
call   1050 <fclose@plt>
mov    -0x28(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_file>:
push   %r15
push   %r14
push   %rbx
lea    0xe74(%rip),%rsi
call   10a0 <fopen@plt>
test   %rax,%rax
je     11f7 <read_file+0x77>
mov    %rax,%rbx
mov    0x2e48(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1090 <fseek@plt>
mov    %rbx,%rdi
call   1070 <ftell@plt>
mov    %rax,%r15
mov    %rbx,%rdi
call   1060 <rewind@plt>
mov    %r15,%rdi
call   1080 <malloc@plt>
mov    %rax,%r14
mov    %rax,%rdi
mov    %r15,%rsi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1040 <fread@plt>
cmp    $0x1,%eax
je     11ed <read_file+0x6d>
mov    %r14,%rdi
call   1030 <free@plt>
xor    %r14d,%r14d
mov    %rbx,%rdi
call   1050 <fclose@plt>
jmp    11fa <read_file+0x7a>
xor    %r14d,%r14d
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [3 x i8] c"rb\00"
@SEEK_END = global i32 0
define i8* @read_file(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i32*
%5 = alloca i64
%6 = alloca i8*
store i8* %0, i8** %3
%7 = load i8*, i8** %3
%8 = call i32* @fopen(i8* %7, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
store i32* %8, i32** %4
%9 = load i32*, i32** %4
%10 = icmp ne i32* %9, null
br i1 %10, label %12, label %11
11: ; preds = %1
store i8* null, i8** %2
br label %36
12: ; preds = %1
%13 = load i32*, i32** %4
%14 = load i32, i32* @SEEK_END
%15 = call i32 @fseek(i32* %13, i32 0, i32 %14)
%16 = load i32*, i32** %4
%17 = call i64 @ftell(i32* %16)
store i64 %17, i64* %5
%18 = load i32*, i32** %4
%19 = call i32 @rewind(i32* %18)
%20 = load i64, i64* %5
%21 = call i8* @malloc(i64 %20)
store i8* %21, i8** %6
%22 = load i8*, i8** %6
%23 = load i64, i64* %5
%24 = load i32*, i32** %4
%25 = call i32 @fread(i8* %22, i64 %23, i32 1, i32* %24)
%26 = icmp ne i32 %25, 1
br i1 %26, label %27, label %32
27: ; preds = %12
%28 = load i8*, i8** %6
%29 = call i32 @free(i8* %28)
%30 = load i32*, i32** %4
%31 = call i32 @fclose(i32* %30)
store i8* null, i8** %2
br label %36
32: ; preds = %12
%33 = load i32*, i32** %4
%34 = call i32 @fclose(i32* %33)
%35 = load i8*, i8** %6
store i8* %35, i8** %2
br label %36
36: ; preds = %32, %27, %11
%37 = load i8*, i8** %2
ret i8* %37
}

LLVM IR (-O2):
@.str = [3 x i8] c"rb\00"
@SEEK_END = global i32 0
define noalias i8* @read_file(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 %17, 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 = tail call i32 @rewind(i32* %2)
%9 = tail call i8* @malloc(i64 %7)
%10 = tail call i32 @fread(i8* %9, i64 %7, i32 1, i32* %2)
%11 = icmp eq i32 %10, 1
br i1 %11, label %14, label %12
12: ; preds = %4
%13 = tail call i32 @free(i8* %9)
br label %14
14: ; preds = %4, %12
%15 = phi i8* [ null, %12 ], [ %9, %4 ]
%16 = tail call i32 @fclose(i32* %2)
br label %17
17: ; preds = %14, %1
%18 = phi i8* [ null, %1 ], [ %15, %14 ]
ret i8* %18
}