#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(char);
int main(void) {
  int c, i;
  for (i = 0; (c = getchar()) != EOF; i++) {
    if (i & 1)
      continue;
    putchar(c);
  }
  putchar('\n');
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0xc(%rbp)
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2ea1(%rip),%rcx
cmp    (%rcx),%eax
je     117c <main+0x5c>
mov    -0xc(%rbp),%eax
and    $0x1,%eax
cmp    $0x0,%eax
je     1163 <main+0x43>
jmp    116e <main+0x4e>
mov    -0x8(%rbp),%eax
movsbl %al,%edi
call   1030 <putchar@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1136 <main+0x16>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
xor    %eax,%eax
call   1040 <getchar@plt>
mov    0x2eb7(%rip),%rbx
cmp    (%rbx),%eax
jne    1148 <main+0x28>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret
xor    %ebp,%ebp
jmp    115e <main+0x3e>
nopl   0x0(%rax)
add    $0x1,%ebp
xor    %eax,%eax
call   1040 <getchar@plt>
cmp    (%rbx),%eax
je     1135 <main+0x15>
test   $0x1,%bpl
jne    1150 <main+0x30>
movsbl %al,%edi
call   1030 <putchar@plt>
jmp    1150 <main+0x30>

LLVM IR (-O0):
@EOF = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %3
br label %4
4: ; preds = %17, %0
%5 = call i32 (...) @getchar()
store i32 %5, i32* %2
%6 = load i32, i32* @EOF
%7 = icmp ne i32 %5, %6
br i1 %7, label %8, label %20
8: ; preds = %4
%9 = load i32, i32* %3
%10 = and i32 %9, 1
%11 = icmp ne i32 %10, 0
br i1 %11, label %12, label %13
12: ; preds = %8
br label %17
13: ; preds = %8
%14 = load i32, i32* %2
%15 = trunc i32 %14 to i8
%16 = call i32 @putchar(i8 signext %15)
br label %17
17: ; preds = %13, %12
%18 = load i32, i32* %3
%19 = add nsw i32 %18, 1
store i32 %19, i32* %3
br label %4
20: ; preds = %4
%21 = call i32 @putchar(i8 signext 10)
ret i32 0
}

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, %12
%5 = phi i32 [ %14, %12 ], [ %1, %0 ]
%6 = phi i32 [ %13, %12 ], [ 0, %0 ]
%7 = and i32 %6, 1
%8 = icmp eq i32 %7, 0
br i1 %8, label %9, label %12
9: ; preds = %4
%10 = trunc i32 %5 to i8
%11 = tail call i32 @putchar(i8 signext %10)
br label %12
12: ; preds = %4, %9
%13 = add nuw nsw i32 %6, 1
%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 = %12, %0
%18 = tail call i32 @putchar(i8 signext 10)
ret i32 0
}