#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*/ fprintf(int /*<<< orphan*/, char *, char const *);
int /*<<< orphan*/ fread(void *, int, long, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, long, int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
void *malloc(long);
int /*<<< orphan*/ stderr;
void *read_config(const char *filename, long *size) {
  FILE *file = fopen(filename, "r");
  if (file == NULL) {
    fprintf(stderr, "Open %s error\n", filename);
    return NULL;
  }
  fseek(file, 0L, SEEK_END);
  *size = ftell(file);
  fseek(file, 0L, SEEK_SET);
  void *buf = malloc(*size);
  fread(buf, 1, *size, file);
  fclose(file);
  return buf;
}


x86 assembly (clang, -O0):
<read_config>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe75(%rip),%rsi
call   1090 <fopen@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    11c5 <read_config+0x55>
mov    0x2e32(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rdx
lea    0xe4f(%rip),%rsi
call   1050 <fprintf@plt>
movq   $0x0,-0x8(%rbp)
jmp    123e <read_config+0xce>
mov    -0x20(%rbp),%rdi
mov    0x2e18(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
call   1080 <fseek@plt>
mov    -0x20(%rbp),%rdi
call   1060 <ftell@plt>
mov    %rax,%rcx
mov    -0x18(%rbp),%rax
mov    %rcx,(%rax)
mov    -0x20(%rbp),%rdi
mov    0x2dd7(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
call   1080 <fseek@plt>
mov    -0x18(%rbp),%rax
mov    (%rax),%rdi
call   1070 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x18(%rbp),%rax
mov    (%rax),%rdx
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):
<read_config>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%r15
lea    0xe7e(%rip),%rsi
call   1090 <fopen@plt>
test   %rax,%rax
je     11eb <read_config+0x7b>
mov    %rax,%rbx
mov    0x2e52(%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    0x2e1c(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1080 <fseek@plt>
mov    (%r14),%r15
mov    %r15,%rdi
call   1070 <malloc@plt>
mov    %rax,%r14
mov    %rax,%rdi
mov    $0x1,%esi
mov    %r15,%rdx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
jmp    1206 <read_config+0x96>
mov    0x2de6(%rip),%rax
mov    (%rax),%edi
lea    0xe07(%rip),%rsi
mov    %r15,%rdx
call   1050 <fprintf@plt>
xor    %r14d,%r14d
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [15 x i8] c"Open %s error\0A\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @read_config(i8* %0, i64* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i64*
%6 = alloca i32*
%7 = alloca i8*
store i8* %0, i8** %4
store i64* %1, i64** %5
%8 = load i8*, i8** %4
%9 = call i32* @fopen(i8* %8, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %9, i32** %6
%10 = load i32*, i32** %6
%11 = icmp eq i32* %10, null
br i1 %11, label %12, label %16
12: ; preds = %2
%13 = load i32, i32* @stderr
%14 = load i8*, i8** %4
%15 = call i32 @fprintf(i32 %13, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0), i8* %14)
store i8* null, i8** %3
br label %37
16: ; preds = %2
%17 = load i32*, i32** %6
%18 = load i32, i32* @SEEK_END
%19 = call i32 @fseek(i32* %17, i64 0, i32 %18)
%20 = load i32*, i32** %6
%21 = call i64 @ftell(i32* %20)
%22 = load i64*, i64** %5
store i64 %21, i64* %22
%23 = load i32*, i32** %6
%24 = load i32, i32* @SEEK_SET
%25 = call i32 @fseek(i32* %23, i64 0, i32 %24)
%26 = load i64*, i64** %5
%27 = load i64, i64* %26
%28 = call i8* @malloc(i64 %27)
store i8* %28, i8** %7
%29 = load i8*, i8** %7
%30 = load i64*, i64** %5
%31 = load i64, i64* %30
%32 = load i32*, i32** %6
%33 = call i32 @fread(i8* %29, i32 1, i64 %31, i32* %32)
%34 = load i32*, i32** %6
%35 = call i32 @fclose(i32* %34)
%36 = load i8*, i8** %7
store i8* %36, i8** %3
br label %37
37: ; preds = %16, %12
%38 = load i8*, i8** %3
ret i8* %38
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [15 x i8] c"Open %s error\0A\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define noalias i8* @read_config(i8* %0, i64* nocapture %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 %5, label %8
5: ; preds = %2
%6 = load i32, i32* @stderr
%7 = tail call i32 @fprintf(i32 %6, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0), i8* %0)
br label %18
8: ; preds = %2
%9 = load i32, i32* @SEEK_END
%10 = tail call i32 @fseek(i32* %3, i64 0, i32 %9)
%11 = tail call i64 @ftell(i32* %3)
store i64 %11, i64* %1
%12 = load i32, i32* @SEEK_SET
%13 = tail call i32 @fseek(i32* %3, i64 0, i32 %12)
%14 = load i64, i64* %1
%15 = tail call i8* @malloc(i64 %14)
%16 = tail call i32 @fread(i8* %15, i32 1, i64 %14, i32* %3)
%17 = tail call i32 @fclose(i32* %3)
br label %18
18: ; preds = %8, %5
%19 = phi i8* [ null, %5 ], [ %15, %8 ]
ret i8* %19
}