#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);
int main(void) {
  int nc;
  while ((nc = getchar()) != EOF) {
    switch (nc) {
    case '\t':
      putchar('\\');
      putchar('t');
      break;
    case '\b':
      putchar('\\');
      putchar('b');
      break;
    case '\\':
      putchar('\\');
      putchar('\\');
      break;
    default:
      putchar(nc);
    }
  }
}


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     11d6 <main+0xb6>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
sub    $0x8,%eax
je     1197 <main+0x77>
jmp    115c <main+0x3c>
mov    -0xc(%rbp),%eax
sub    $0x9,%eax
je     117e <main+0x5e>
jmp    116d <main+0x4d>
mov    -0xc(%rbp),%eax
sub    $0x5c,%eax
je     11b0 <main+0x90>
jmp    11c9 <main+0xa9>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x74,%edi
call   1030 <putchar@plt>
jmp    11d1 <main+0xb1>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x62,%edi
call   1030 <putchar@plt>
jmp    11d1 <main+0xb1>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x5c,%edi
call   1030 <putchar@plt>
jmp    11d1 <main+0xb1>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
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 = %21, %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 %22
7: ; preds = %3
%8 = load i32, i32* %2
switch i32 %8, label %18 [
i32 9, label %9
i32 8, label %12
i32 92, label %15
]
9: ; preds = %7
%10 = call i32 @putchar(i32 92)
%11 = call i32 @putchar(i32 116)
br label %21
12: ; preds = %7
%13 = call i32 @putchar(i32 92)
%14 = call i32 @putchar(i32 98)
br label %21
15: ; preds = %7
%16 = call i32 @putchar(i32 92)
%17 = call i32 @putchar(i32 92)
br label %21
18: ; preds = %7
%19 = load i32, i32* %2
%20 = call i32 @putchar(i32 %19)
br label %21
21: ; preds = %18, %15, %12, %9
br label %3
22: ; preds = %3
%23 = load i32, i32* %1
ret i32 %23
}

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, %6, %7
%9 = phi i32 [ 98, %6 ], [ 92, %7 ], [ 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
}