#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*/ assert(int /*<<< orphan*/ *);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char const *, char *);
int /*<<< orphan*/ fread(char *, size_t, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
size_t ftell(int /*<<< orphan*/ *);
char *malloc(size_t);
char *read_file(const char *path) {
  FILE *file = fopen(path, "r");
  assert(file);
  fseek(file, 0, SEEK_END);
  size_t size = ftell(file);
  fseek(file, 0, SEEK_SET);
  char *result = malloc(size + 1);
  fread(result, size, 1, file);
  result[size] = '\0';
  fclose(file);
  return result;
}


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,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1050 <assert@plt>
mov    -0x10(%rbp),%rdi
mov    0x2e44(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1080 <fseek@plt>
mov    -0x10(%rbp),%rdi
call   1060 <ftell@plt>
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
mov    0x2e13(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1080 <fseek@plt>
mov    -0x18(%rbp),%rdi
add    $0x1,%rdi
call   1070 <malloc@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
mov    -0x18(%rbp),%rsi
mov    -0x10(%rbp),%rcx
mov    $0x1,%edx
call   1030 <fread@plt>
mov    -0x20(%rbp),%rax
mov    -0x18(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x10(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x20(%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    %rax,%rdi
call   1050 <assert@plt>
mov    0x2e55(%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    0x2e27(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1080 <fseek@plt>
lea    0x1(%r14),%rdi
call   1070 <malloc@plt>
mov    %rax,%r15
mov    %rax,%rdi
mov    %r14,%rsi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1030 <fread@plt>
movb   $0x0,(%r15,%r14,1)
mov    %rbx,%rdi
call   1040 <fclose@plt>
mov    %r15,%rax
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* @read_file(i8* %0) {
%2 = alloca i8*
%3 = alloca i32*
%4 = alloca i64
%5 = alloca i8*
store i8* %0, i8** %2
%6 = load i8*, i8** %2
%7 = call i32* @fopen(i8* %6, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %7, i32** %3
%8 = load i32*, i32** %3
%9 = call i32 @assert(i32* %8)
%10 = load i32*, i32** %3
%11 = load i32, i32* @SEEK_END
%12 = call i32 @fseek(i32* %10, i32 0, i32 %11)
%13 = load i32*, i32** %3
%14 = call i64 @ftell(i32* %13)
store i64 %14, i64* %4
%15 = load i32*, i32** %3
%16 = load i32, i32* @SEEK_SET
%17 = call i32 @fseek(i32* %15, i32 0, i32 %16)
%18 = load i64, i64* %4
%19 = add i64 %18, 1
%20 = call i8* @malloc(i64 %19)
store i8* %20, i8** %5
%21 = load i8*, i8** %5
%22 = load i64, i64* %4
%23 = load i32*, i32** %3
%24 = call i32 @fread(i8* %21, i64 %22, i32 1, i32* %23)
%25 = load i8*, i8** %5
%26 = load i64, i64* %4
%27 = getelementptr inbounds i8, i8* %25, i64 %26
store i8 0, i8* %27
%28 = load i32*, i32** %3
%29 = call i32 @fclose(i32* %28)
%30 = load i8*, i8** %5
ret i8* %30
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define noalias i8* @read_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 = tail call i32 @assert(i32* %2)
%4 = load i32, i32* @SEEK_END
%5 = tail call i32 @fseek(i32* %2, i32 0, i32 %4)
%6 = tail call i64 @ftell(i32* %2)
%7 = load i32, i32* @SEEK_SET
%8 = tail call i32 @fseek(i32* %2, i32 0, i32 %7)
%9 = add i64 %6, 1
%10 = tail call i8* @malloc(i64 %9)
%11 = tail call i32 @fread(i8* %10, i64 %6, i32 1, i32* %2)
%12 = getelementptr inbounds i8, i8* %10, i64 %6
store i8 0, i8* %12
%13 = tail call i32 @fclose(i32* %2)
ret i8* %10
}