#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);
main() {
  int c;
  while ((c = getchar()) != EOF) {
    switch (c) {
    case '\t':
      printf("\\t");
      break;
    case '\b':
      printf("\\b");
      break;
    case '\\':
      putchar('\\');
    default:
      putchar(c);
      break;
    }
  }
  printf("\n");
}


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     11c7 <main+0x97>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
sub    $0x8,%eax
je     119f <main+0x6f>
jmp    116c <main+0x3c>
mov    -0xc(%rbp),%eax
sub    $0x9,%eax
je     118e <main+0x5e>
jmp    117d <main+0x4d>
mov    -0xc(%rbp),%eax
sub    $0x5c,%eax
je     11b0 <main+0x80>
jmp    11ba <main+0x8a>
lea    0xe6b(%rip),%rdi
call   1040 <printf@plt>
jmp    11c2 <main+0x92>
lea    0xe5d(%rip),%rdi
call   1040 <printf@plt>
jmp    11c2 <main+0x92>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    113f <main+0xf>
lea    0xe38(%rip),%rdi
call   1040 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
xor    %eax,%eax
call   1050 <getchar@plt>
mov    0x2ea3(%rip),%rbx
cmp    (%rbx),%eax
jne    1160 <main+0x30>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret
mov    %eax,%ebp
lea    0xe9a(%rip),%r14
lea    0xe90(%rip),%r15
jmp    119e <main+0x6e>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    %ebp,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1050 <getchar@plt>
mov    %eax,%ebp
cmp    (%rbx),%eax
je     1149 <main+0x19>
cmp    $0x8,%ebp
je     11c0 <main+0x90>
cmp    $0x5c,%ebp
je     1180 <main+0x50>
cmp    $0x9,%ebp
jne    118a <main+0x5a>
mov    %r15,%rdi
call   1040 <printf@plt>
jmp    1191 <main+0x61>
nopw   0x0(%rax,%rax,1)
mov    %r14,%rdi
call   1040 <printf@plt>
jmp    1191 <main+0x61>

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

LLVM IR (-O2):
@EOF = global i32 0
@.str = [3 x i8] c"\\t\00"
@.str.1 = [3 x i8] c"\\b\00"
define i32 @main() {
%1 = tail call i32 (...) @getchar()
%2 = load i32, i32* @EOF
%3 = icmp eq i32 %1, %2
br i1 %3, label %18, label %4
4: ; preds = %0, %14
%5 = phi i32 [ %15, %14 ], [ %1, %0 ]
switch i32 %5, label %12 [
i32 9, label %6
i32 8, label %8
i32 92, label %10
]
6: ; preds = %4
%7 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
br label %14
8: ; preds = %4
%9 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
br label %14
10: ; preds = %4
%11 = tail call i32 @putchar(i32 92)
br label %12
12: ; preds = %4, %10
%13 = tail call i32 @putchar(i32 %5)
br label %14
14: ; preds = %12, %8, %6
%15 = tail call i32 (...) @getchar()
%16 = load i32, i32* @EOF
%17 = icmp eq i32 %15, %16
br i1 %17, label %18, label %4
18: ; preds = %14, %0
%19 = tail call i32 @putchar(i32 10)
ret i32 0
}