#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*/ putchar(int);
main() {
  int c;
  while ((c = getchar()) != EOF) {
    if (c == '\t') {
      putchar('\\');
      putchar('t');
    } else if (c == '\b') {
      putchar('\\');
      putchar('b');
    } else if (c == '\\') {
      putchar(c);
      putchar(c);
    } else {
      putchar(c);
    }
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2ea8(%rip),%rcx
cmp    (%rcx),%eax
je     11c4 <main+0xa4>
cmpl   $0x9,-0x8(%rbp)
jne    116b <main+0x4b>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x74,%edi
call   1030 <putchar@plt>
jmp    11bf <main+0x9f>
cmpl   $0x8,-0x8(%rbp)
jne    118e <main+0x6e>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x62,%edi
call   1030 <putchar@plt>
jmp    11ba <main+0x9a>
cmpl   $0x5c,-0x8(%rbp)
jne    11ad <main+0x8d>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    11b5 <main+0x95>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    11ba <main+0x9a>
jmp    11bf <main+0x9f>
jmp    112f <main+0xf>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
xor    %eax,%eax
call   1040 <getchar@plt>
mov    0x2eb6(%rip),%r14
cmp    (%r14),%eax
jne    1141 <main+0x21>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
mov    %eax,%ebx
jmp    1174 <main+0x54>
cs nopw 0x0(%rax,%rax,1)
nop
mov    $0x74,%ebx
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    %ebx,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %eax,%ebx
cmp    (%r14),%eax
je     1137 <main+0x17>
cmp    $0x5c,%ebx
je     1190 <main+0x70>
cmp    $0x9,%ebx
je     1150 <main+0x30>
cmp    $0x8,%ebx
jne    115f <main+0x3f>
mov    $0x62,%ebx
jmp    1155 <main+0x35>
nopw   0x0(%rax,%rax,1)
mov    $0x5c,%ebx
jmp    1155 <main+0x35>

LLVM IR (-O0):
@EOF = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
br label %3
3: ; preds = %32, %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 %33
7: ; preds = %3
%8 = load i32, i32* %2
%9 = icmp eq i32 %8, 9
br i1 %9, label %10, label %13
10: ; preds = %7
%11 = call i32 @putchar(i32 92)
%12 = call i32 @putchar(i32 116)
br label %32
13: ; preds = %7
%14 = load i32, i32* %2
%15 = icmp eq i32 %14, 8
br i1 %15, label %16, label %19
16: ; preds = %13
%17 = call i32 @putchar(i32 92)
%18 = call i32 @putchar(i32 98)
br label %31
19: ; preds = %13
%20 = load i32, i32* %2
%21 = icmp eq i32 %20, 92
br i1 %21, label %22, label %27
22: ; preds = %19
%23 = load i32, i32* %2
%24 = call i32 @putchar(i32 %23)
%25 = load i32, i32* %2
%26 = call i32 @putchar(i32 %25)
br label %30
27: ; preds = %19
%28 = load i32, i32* %2
%29 = call i32 @putchar(i32 %28)
br label %30
30: ; preds = %27, %22
br label %31
31: ; preds = %30, %16
br label %32
32: ; preds = %31, %10
br label %3
33: ; preds = %3
%34 = load i32, i32* %1
ret i32 %34
}

LLVM IR (-O2):
@EOF = global i32 0
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 i32 [ 92, %7 ], [ 98, %6 ], [ 116, %4 ]
%10 = tail call i32 @putchar(i32 92)
br label %11
11: ; preds = %8, %4
%12 = phi i32 [ %5, %4 ], [ %9, %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
}