#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, lastc;
  lastc = 'a';
  while ((c = getchar()) != EOF) {
    if (c != ' ')
      putchar(c);
    if (c == ' ')
      if (lastc != ' ')
        putchar(c);
    lastc = c;
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x61,-0xc(%rbp)
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2ea1(%rip),%rcx
cmp    (%rcx),%eax
je     118d <main+0x6d>
cmpl   $0x20,-0x8(%rbp)
je     1161 <main+0x41>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
cmpl   $0x20,-0x8(%rbp)
jne    1182 <main+0x62>
cmpl   $0x20,-0xc(%rbp)
je     117d <main+0x5d>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    1182 <main+0x62>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
jmp    1136 <main+0x16>
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
mov    $0x61,%ecx
jmp    1162 <main+0x42>
cs nopw 0x0(%rax,%rax,1)
nop
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    1150 <main+0x30>
mov    $0x20,%edi
cmp    $0x20,%ecx
jne    1150 <main+0x30>
jmp    1155 <main+0x35>

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 97, i32* %3
br label %4
4: ; preds = %24, %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 %14
11: ; preds = %8
%12 = load i32, i32* %2
%13 = call i32 @putchar(i32 %12)
br label %14
14: ; preds = %11, %8
%15 = load i32, i32* %2
%16 = icmp eq i32 %15, 32
br i1 %16, label %17, label %24
17: ; preds = %14
%18 = load i32, i32* %3
%19 = icmp ne i32 %18, 32
br i1 %19, label %20, label %23
20: ; preds = %17
%21 = load i32, i32* %2
%22 = call i32 @putchar(i32 %21)
br label %23
23: ; preds = %20, %17
br label %24
24: ; preds = %23, %14
%25 = load i32, i32* %2
store i32 %25, i32* %3
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 %17, label %4
4: ; preds = %0, %13
%5 = phi i32 [ %14, %13 ], [ %1, %0 ]
%6 = phi i32 [ %5, %13 ], [ 97, %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
}