#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, position;
  position = 0;
  while ((c = getchar()) != EOF) {
    if (c != ' ') {
      putchar(c);
      if (position == 0)
        position = 1;
    } else {
      if (position == 1) {
        putchar(c);
        position = 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     119a <main+0x7a>
cmpl   $0x20,-0x8(%rbp)
je     1177 <main+0x57>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
cmpl   $0x0,-0xc(%rbp)
jne    1172 <main+0x52>
movl   $0x1,-0xc(%rbp)
jmp    1195 <main+0x75>
cmpl   $0x1,-0xc(%rbp)
jne    1190 <main+0x70>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
movl   $0x0,-0xc(%rbp)
jmp    1195 <main+0x75>
jmp    1136 <main+0x16>
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   1040 <getchar@plt>
mov    0x2eb3(%rip),%r15
cmp    (%r15),%eax
jne    1147 <main+0x27>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret
mov    $0x1,%r14d
xor    %ebp,%ebp
jmp    117d <main+0x5d>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
mov    %eax,%edi
call   1030 <putchar@plt>
test   %ebp,%ebp
cmove  %r14d,%ebp
mov    %ebp,%ebx
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %ebx,%ebp
cmp    (%r15),%eax
je     113a <main+0x1a>
cmp    $0x20,%eax
jne    1160 <main+0x40>
xor    %ebx,%ebx
cmp    $0x1,%ebp
jne    116f <main+0x4f>
mov    $0x20,%edi
call   1030 <putchar@plt>
jmp    116f <main+0x4f>

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 = %25, %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 %26
8: ; preds = %4
%9 = load i32, i32* %2
%10 = icmp ne i32 %9, 32
br i1 %10, label %11, label %18
11: ; preds = %8
%12 = load i32, i32* %2
%13 = call i32 @putchar(i32 %12)
%14 = load i32, i32* %3
%15 = icmp eq i32 %14, 0
br i1 %15, label %16, label %17
16: ; preds = %11
store i32 1, i32* %3
br label %17
17: ; preds = %16, %11
br label %25
18: ; preds = %8
%19 = load i32, i32* %3
%20 = icmp eq i32 %19, 1
br i1 %20, label %21, label %24
21: ; preds = %18
%22 = load i32, i32* %2
%23 = call i32 @putchar(i32 %22)
store i32 0, i32* %3
br label %24
24: ; preds = %21, %18
br label %25
25: ; preds = %24, %17
br label %4
26: ; preds = %4
%27 = load i32, i32* %1
ret i32 %27
}

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 %21, label %4
4: ; preds = %0, %16
%5 = phi i32 [ %18, %16 ], [ %1, %0 ]
%6 = phi i32 [ %17, %16 ], [ 0, %0 ]
%7 = icmp eq i32 %5, 32
br i1 %7, label %12, label %8
8: ; preds = %4
%9 = tail call i32 @putchar(i32 %5)
%10 = icmp eq i32 %6, 0
%11 = select i1 %10, i32 1, i32 %6
br label %16
12: ; preds = %4
%13 = icmp eq i32 %6, 1
br i1 %13, label %14, label %16
14: ; preds = %12
%15 = tail call i32 @putchar(i32 32)
br label %16
16: ; preds = %12, %14, %8
%17 = phi i32 [ %11, %8 ], [ 0, %14 ], [ 0, %12 ]
%18 = tail call i32 (...) @getchar()
%19 = load i32, i32* @EOF
%20 = icmp eq i32 %18, %19
br i1 %20, label %21, label %4
21: ; preds = %16, %0
ret i32 0
}