#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);
main() {
  int c, ow = 0;
  while ((c = getchar()) != EOF) {
    if (c != ' ') {
      putchar(c);
      ow = 0;
    }
    if (c == ' ' && ow == 0) {
      putchar(' ');
      ow = 1;
    }
  }
}


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     1195 <main+0x75>
cmpl   $0x20,-0x8(%rbp)
je     116b <main+0x4b>
mov    -0x8(%rbp),%eax
movsbl %al,%edi
call   1030 <putchar@plt>
movl   $0x0,-0xc(%rbp)
cmpl   $0x20,-0x8(%rbp)
jne    1190 <main+0x70>
cmpl   $0x0,-0xc(%rbp)
jne    1190 <main+0x70>
mov    $0x20,%edi
call   1030 <putchar@plt>
movl   $0x1,-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
xor    %ebp,%ebp
jmp    1165 <main+0x45>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
xor    %ebp,%ebp
movsbl %al,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1040 <getchar@plt>
cmp    (%rbx),%eax
je     1135 <main+0x15>
cmp    $0x20,%eax
jne    1150 <main+0x30>
test   %ebp,%ebp
jne    115a <main+0x3a>
mov    $0x1,%ebp
mov    $0x20,%al
jmp    1152 <main+0x32>

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 = %23, %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 %24
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
%13 = trunc i32 %12 to i8
%14 = call i32 @putchar(i8 signext %13)
store i32 0, i32* %3
br label %15
15: ; preds = %11, %8
%16 = load i32, i32* %2
%17 = icmp eq i32 %16, 32
br i1 %17, label %18, label %23
18: ; preds = %15
%19 = load i32, i32* %3
%20 = icmp eq i32 %19, 0
br i1 %20, label %21, label %23
21: ; preds = %18
%22 = call i32 @putchar(i8 signext 32)
store i32 1, i32* %3
br label %23
23: ; preds = %21, %18, %15
br label %4
24: ; preds = %4
%25 = load i32, i32* %1
ret i32 %25
}

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 %10, label %8
8: ; preds = %4
%9 = trunc i32 %5 to i8
br label %12
10: ; preds = %4
%11 = icmp eq i32 %6, 0
br i1 %11, label %12, label %16
12: ; preds = %10, %8
%13 = phi i8 [ %9, %8 ], [ 32, %10 ]
%14 = phi i32 [ 0, %8 ], [ 1, %10 ]
%15 = tail call i32 @putchar(i8 signext %13)
br label %16
16: ; preds = %12, %10
%17 = phi i32 [ %6, %10 ], [ %14, %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
}