#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 /*<<< orphan*/ fread(char *, int, long, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
char *malloc(long);
int /*<<< orphan*/ rewind(int /*<<< orphan*/ *);
char *read_file(const char *name) {
  char *file_contents;
  long file_size;
  FILE *file = fopen(name, "rb");
  fseek(file, 0, SEEK_END);
  file_size = ftell(file);
  rewind(file);
  file_contents = malloc(file_size * (sizeof(char)));
  fread(file_contents, sizeof(char), file_size, file);
  fclose(file);
  file_contents[file_size - 1] = '\0';
  return file_contents;
}


x86 assembly (clang, -O0):
<read_file>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xe79(%rip),%rsi
call   1090 <fopen@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
mov    0x2e4d(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1080 <fseek@plt>
mov    -0x20(%rbp),%rdi
call   1060 <ftell@plt>
mov    %rax,-0x18(%rbp)
mov    -0x20(%rbp),%rdi
call   1050 <rewind@plt>
mov    -0x18(%rbp),%rdi
shl    $0x0,%rdi
call   1070 <malloc@plt>
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
mov    -0x18(%rbp),%rdx
mov    -0x20(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    -0x20(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x10(%rbp),%rax
mov    -0x18(%rbp),%rcx
sub    $0x1,%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x10(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_file>:
push   %r15
push   %r14
push   %rbx
lea    0xe84(%rip),%rsi
call   1090 <fopen@plt>
mov    %rax,%rbx
mov    0x2e5d(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1080 <fseek@plt>
mov    %rbx,%rdi
call   1060 <ftell@plt>
mov    %rax,%r14
mov    %rbx,%rdi
call   1050 <rewind@plt>
mov    %r14,%rdi
call   1070 <malloc@plt>
mov    %rax,%r15
mov    %rax,%rdi
mov    $0x1,%esi
mov    %r14,%rdx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
movb   $0x0,-0x1(%r14,%r15,1)
mov    %r15,%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 i64
%5 = alloca i32*
store i8* %0, i8** %2
%6 = load i8*, i8** %2
%7 = call i32* @fopen(i8* %6, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
store i32* %7, i32** %5
%8 = load i32*, i32** %5
%9 = load i32, i32* @SEEK_END
%10 = call i32 @fseek(i32* %8, i32 0, i32 %9)
%11 = load i32*, i32** %5
%12 = call i64 @ftell(i32* %11)
store i64 %12, i64* %4
%13 = load i32*, i32** %5
%14 = call i32 @rewind(i32* %13)
%15 = load i64, i64* %4
%16 = mul i64 %15, 1
%17 = call i8* @malloc(i64 %16)
store i8* %17, i8** %3
%18 = load i8*, i8** %3
%19 = load i64, i64* %4
%20 = load i32*, i32** %5
%21 = call i32 @fread(i8* %18, i32 1, i64 %19, i32* %20)
%22 = load i32*, i32** %5
%23 = call i32 @fclose(i32* %22)
%24 = load i8*, i8** %3
%25 = load i64, i64* %4
%26 = sub nsw i64 %25, 1
%27 = getelementptr inbounds i8, i8* %24, i64 %26
store i8 0, i8* %27
%28 = load i8*, i8** %3
ret i8* %28
}

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 = load i32, i32* @SEEK_END
%4 = tail call i32 @fseek(i32* %2, i32 0, i32 %3)
%5 = tail call i64 @ftell(i32* %2)
%6 = tail call i32 @rewind(i32* %2)
%7 = tail call i8* @malloc(i64 %5)
%8 = tail call i32 @fread(i8* %7, i32 1, i64 %5, i32* %2)
%9 = tail call i32 @fclose(i32* %2)
%10 = add nsw i64 %5, -1
%11 = getelementptr inbounds i8, i8* %7, i64 %10
store i8 0, i8* %11
ret i8* %7
}