#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;
  int prev;
  while ((c = getchar()) != EOF) {
    if (c != ' ') {
      prev = c;
      putchar(c);
    }
    if (c == ' ') {
      if (prev != ' ') {
        prev = c;
        putchar(c);
      }
    }
  }
}


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     118c <main+0x6c>
cmpl   $0x20,-0x8(%rbp)
je     1160 <main+0x40>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
cmpl   $0x20,-0x8(%rbp)
jne    1187 <main+0x67>
cmpl   $0x20,-0xc(%rbp)
je     1182 <main+0x62>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    1187 <main+0x67>
jmp    112f <main+0xf>
mov    -0x4(%rbp),%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    113e <main+0x1e>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret
jmp    1152 <main+0x32>
call   1030 <putchar@plt>
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %ebp,%ecx
cmp    (%rbx),%eax
je     1135 <main+0x15>
mov    %eax,%ebp
mov    %eax,%edi
cmp    $0x20,%eax
jne    1140 <main+0x20>
mov    $0x20,%edi
cmp    $0x20,%ecx
jne    1140 <main+0x20>
jmp    1145 <main+0x25>

LLVM IR (-O0):
@EOF = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
br label %4
4: ; preds = %26, %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 %27
8: ; preds = %4
%9 = load i32, i32* %2
%10 = icmp ne i32 %9, 32
br i1 %10, label %11, label %15
11: ; preds = %8
%12 = load i32, i32* %2
store i32 %12, i32* %3
%13 = load i32, i32* %2
%14 = call i32 @putchar(i32 %13)
br label %15
15: ; preds = %11, %8
%16 = load i32, i32* %2
%17 = icmp eq i32 %16, 32
br i1 %17, label %18, label %26
18: ; preds = %15
%19 = load i32, i32* %3
%20 = icmp ne i32 %19, 32
br i1 %20, label %21, label %25
21: ; preds = %18
%22 = load i32, i32* %2
store i32 %22, i32* %3
%23 = load i32, i32* %2
%24 = call i32 @putchar(i32 %23)
br label %25
25: ; preds = %21, %18
br label %26
26: ; preds = %25, %15
br label %4
27: ; preds = %4
%28 = load i32, i32* %1
ret i32 %28
}

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, %13
%5 = phi i32 [ %14, %13 ], [ %1, %0 ]
%6 = phi i32 [ %5, %13 ], [ undef, %0 ]
%7 = icmp eq i32 %5, 32
br i1 %7, label %8, label %10
8: ; preds = %4
%9 = icmp eq i32 %6, 32
br i1 %9, label %13, label %10
10: ; preds = %8, %4
%11 = phi i32 [ %5, %4 ], [ 32, %8 ]
%12 = tail call i32 @putchar(i32 %11)
br label %13
13: ; preds = %10, %8
%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 = %13, %0
ret i32 0
}