#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 */

/* Variables and functions */
int EOF;
int getchar();
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ putchar(int);
int main() {
  int c;
  while ((c = getchar()) != EOF) {
    if (c == '\t') {
      c = 0;
      printf("\\t");
    }
    if (c == '\b') {
      c = 0;
      printf("\\b");
    }
    if (c == '\\') {
      c = 0;
      printf("\\\\");
    }
    putchar(c);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    $0x0,%al
call   1050 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2e98(%rip),%rcx
cmp    (%rcx),%eax
je     11bc <main+0x8c>
cmpl   $0x9,-0x8(%rbp)
jne    1175 <main+0x45>
movl   $0x0,-0x8(%rbp)
lea    0xe90(%rip),%rdi
call   1040 <printf@plt>
cmpl   $0x8,-0x8(%rbp)
jne    1192 <main+0x62>
movl   $0x0,-0x8(%rbp)
lea    0xe76(%rip),%rdi
call   1040 <printf@plt>
cmpl   $0x5c,-0x8(%rbp)
jne    11af <main+0x7f>
movl   $0x0,-0x8(%rbp)
lea    0xe5c(%rip),%rdi
call   1040 <printf@plt>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    113f <main+0xf>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
xor    %eax,%eax
call   1050 <getchar@plt>
mov    0x2ea2(%rip),%rbx
cmp    (%rbx),%eax
jne    1158 <main+0x28>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret
lea    0xea1(%rip),%r14
lea    0xea0(%rip),%r15
lea    0xe96(%rip),%r12
jmp    118c <main+0x5c>
nop
mov    %r15,%rdi
call   1040 <printf@plt>
xor    %eax,%eax
mov    %eax,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1050 <getchar@plt>
cmp    (%rbx),%eax
je     114a <main+0x1a>
cmp    $0x5c,%eax
je     1170 <main+0x40>
mov    %r14,%rdi
cmp    $0x9,%eax
je     1173 <main+0x43>
cmp    $0x8,%eax
jne    117a <main+0x4a>
mov    %r12,%rdi
jmp    1173 <main+0x43>

LLVM IR (-O0):
@EOF = global i32 0
@.str = [3 x i8] c"\\t\00"
@.str.1 = [3 x i8] c"\\b\00"
@.str.2 = [3 x i8] c"\\\\\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
br label %3
3: ; preds = %22, %0
%4 = call i32 (...) @getchar()
store i32 %4, i32* %2
%5 = load i32, i32* @EOF
%6 = icmp ne i32 %4, %5
br i1 %6, label %7, label %25
7: ; preds = %3
%8 = load i32, i32* %2
%9 = icmp eq i32 %8, 9
br i1 %9, label %10, label %12
10: ; preds = %7
store i32 0, i32* %2
%11 = call i32 @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
br label %12
12: ; preds = %10, %7
%13 = load i32, i32* %2
%14 = icmp eq i32 %13, 8
br i1 %14, label %15, label %17
15: ; preds = %12
store i32 0, i32* %2
%16 = call i32 @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
br label %17
17: ; preds = %15, %12
%18 = load i32, i32* %2
%19 = icmp eq i32 %18, 92
br i1 %19, label %20, label %22
20: ; preds = %17
store i32 0, i32* %2
%21 = call i32 @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
br label %22
22: ; preds = %20, %17
%23 = load i32, i32* %2
%24 = call i32 @putchar(i32 %23)
br label %3
25: ; preds = %3
ret i32 0
}

LLVM IR (-O2):
@EOF = global i32 0
@.str = [3 x i8] c"\\t\00"
@.str.1 = [3 x i8] c"\\b\00"
@.str.2 = [3 x i8] c"\\\\\00"
define i32 @main() {
%1 = tail call i32 (...) @getchar()
%2 = load i32, i32* @EOF
%3 = icmp eq i32 %1, %2
br i1 %3, label %17, label %4
4: ; preds = %0, %11
%5 = phi i32 [ %14, %11 ], [ %1, %0 ]
switch i32 %5, label %11 [
i32 9, label %8
i32 8, label %6
i32 92, label %7
]
6: ; preds = %4
br label %8
7: ; preds = %4
br label %8
8: ; preds = %4, %7, %6
%9 = phi i8* [ getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), %6 ], [ getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), %7 ], [ getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), %4 ]
%10 = tail call i32 @printf(i8* dereferenceable(1) %9)
br label %11
11: ; preds = %8, %4
%12 = phi i32 [ %5, %4 ], [ 0, %8 ]
%13 = tail call i32 @putchar(i32 %12)
%14 = tail call i32 (...) @getchar()
%15 = load i32, i32* @EOF
%16 = icmp eq i32 %14, %15
br i1 %16, label %17, label %4
17: ; preds = %11, %0
ret i32 0
}