#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') {
      putchar('\\');
      putchar('t');
    } else if (c == '\b') {
      putchar('\\');
      putchar('b');
    } else if (c == '\\') {
      putchar('\\');
      putchar('\\');
    } else {
      putchar(c);
    }
  }
  printf("You signaled exit with EOF or CTRL+D\n");
  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     11d8 <main+0xa8>
cmpl   $0x9,-0x8(%rbp)
jne    117b <main+0x4b>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x74,%edi
call   1030 <putchar@plt>
jmp    11d3 <main+0xa3>
cmpl   $0x8,-0x8(%rbp)
jne    119e <main+0x6e>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x62,%edi
call   1030 <putchar@plt>
jmp    11ce <main+0x9e>
cmpl   $0x5c,-0x8(%rbp)
jne    11c1 <main+0x91>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x5c,%edi
call   1030 <putchar@plt>
jmp    11c9 <main+0x99>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    11ce <main+0x9e>
jmp    11d3 <main+0xa3>
jmp    113f <main+0xf>
lea    0xe21(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
xor    %eax,%eax
call   1050 <getchar@plt>
mov    0x2ea6(%rip),%r14
cmp    (%r14),%eax
jne    115d <main+0x2d>
lea    0xeb2(%rip),%rdi
call   1040 <puts@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
mov    %eax,%ebx
jmp    1194 <main+0x64>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
mov    $0x74,%ebx
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    %ebx,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1050 <getchar@plt>
mov    %eax,%ebx
cmp    (%r14),%eax
je     1147 <main+0x17>
cmp    $0x5c,%ebx
je     11b0 <main+0x80>
cmp    $0x9,%ebx
je     1170 <main+0x40>
cmp    $0x8,%ebx
jne    117f <main+0x4f>
mov    $0x62,%ebx
jmp    1175 <main+0x45>
nopw   0x0(%rax,%rax,1)
mov    $0x5c,%ebx
jmp    1175 <main+0x45>

LLVM IR (-O0):
@EOF = global i32 0
@.str = [38 x i8] c"You signaled exit with EOF or CTRL+D\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
br label %3
3: ; preds = %30, %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 %31
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 %30
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 %29
19: ; preds = %13
%20 = load i32, i32* %2
%21 = icmp eq i32 %20, 92
br i1 %21, label %22, label %25
22: ; preds = %19
%23 = call i32 @putchar(i32 92)
%24 = call i32 @putchar(i32 92)
br label %28
25: ; preds = %19
%26 = load i32, i32* %2
%27 = call i32 @putchar(i32 %26)
br label %28
28: ; preds = %25, %22
br label %29
29: ; preds = %28, %16
br label %30
30: ; preds = %29, %10
br label %3
31: ; preds = %3
%32 = call i32 @printf(i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@EOF = global i32 0
@str = [37 x i8] c"You signaled exit with EOF or CTRL+D\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 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
%18 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([37 x i8], [37 x i8]* @str, i64 0, i64 0))
ret i32 0
}