#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, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
scalar_t__ ftell(int /*<<< orphan*/ *);
char *malloc(int);
char *file_read(char *filename, int *filesize) {
  FILE *in;
  char *buffer;
  if ((in = fopen(filename, "rb")) == NULL) {
    return NULL;
  }
  fseek(in, 0, SEEK_END);
  *filesize = (int)ftell(in);
  fseek(in, 0, SEEK_SET);
  buffer = malloc(*filesize);
  fread(buffer, sizeof(char), *filesize, in);
  fclose(in);
  return buffer;
}


x86 assembly (clang, -O0):
<file_read>:
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)
cmp    $0x0,%rax
jne    119b <file_read+0x3b>
movq   $0x0,-0x8(%rbp)
jmp    120c <file_read+0xac>
mov    -0x20(%rbp),%rdi
mov    0x2e42(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x20(%rbp),%rdi
call   1050 <ftell@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%rax
mov    %ecx,(%rax)
mov    -0x20(%rbp),%rdi
mov    0x2e0d(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x18(%rbp),%rax
mov    (%rax),%edi
call   1060 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x18(%rbp),%rax
mov    (%rax),%edx
mov    -0x20(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    -0x20(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x28(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<file_read>:
push   %rbp
push   %r14
push   %rbx
mov    %rsi,%r14
lea    0xe92(%rip),%rsi
call   1080 <fopen@plt>
test   %rax,%rax
je     11d5 <file_read+0x75>
mov    %rax,%rbx
mov    0x2e66(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    %rbx,%rdi
call   1050 <ftell@plt>
mov    %eax,(%r14)
mov    0x2e38(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    (%r14),%ebp
mov    %ebp,%edi
call   1060 <malloc@plt>
mov    %rax,%r14
mov    %rax,%rdi
mov    $0x1,%esi
mov    %ebp,%edx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
jmp    11d8 <file_read+0x78>
xor    %r14d,%r14d
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %rbp
ret

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

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