#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, is;
  c = is = 0;
  while ((c = getchar()) != EOF) {
    if (c == ' ') {
      if (is == 0) {
        is = 1;
        putchar(c);
      }
    }
    if (c != ' ') {
      putchar(c);
      is = 0;
    }
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0xc(%rbp)
movl   $0x0,-0x8(%rbp)
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2e9a(%rip),%rcx
cmp    (%rcx),%eax
je     119c <main+0x7c>
cmpl   $0x20,-0x8(%rbp)
jne    117e <main+0x5e>
cmpl   $0x0,-0xc(%rbp)
jne    1179 <main+0x59>
movl   $0x1,-0xc(%rbp)
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    117e <main+0x5e>
cmpl   $0x20,-0x8(%rbp)
je     1197 <main+0x77>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
movl   $0x0,-0xc(%rbp)
jmp    113d <main+0x1d>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r14
push   %rbx
xor    %eax,%eax
call   1040 <getchar@plt>
mov    0x2eb6(%rip),%r14
cmp    (%r14),%eax
jne    113e <main+0x1e>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret
mov    %eax,%ebx
xor    %ebp,%ebp
jmp    115e <main+0x3e>
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %eax,%ebx
cmp    (%r14),%eax
je     1137 <main+0x17>
cmp    $0x20,%ebx
jne    1176 <main+0x56>
test   %ebp,%ebp
jne    1176 <main+0x56>
mov    $0x20,%edi
call   1030 <putchar@plt>
mov    $0x1,%ebp
cmp    $0x20,%ebx
je     1150 <main+0x30>
mov    %ebx,%edi
call   1030 <putchar@plt>
xor    %ebp,%ebp
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
store i32 0, i32* %2
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 %25
8: ; preds = %4
%9 = load i32, i32* %2
%10 = icmp eq i32 %9, 32
br i1 %10, label %11, label %18
11: ; preds = %8
%12 = load i32, i32* %3
%13 = icmp eq i32 %12, 0
br i1 %13, label %14, label %17
14: ; preds = %11
store i32 1, i32* %3
%15 = load i32, i32* %2
%16 = call i32 @putchar(i32 %15)
br label %17
17: ; preds = %14, %11
br label %18
18: ; preds = %17, %8
%19 = load i32, i32* %2
%20 = icmp ne i32 %19, 32
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 %4
25: ; preds = %4
%26 = load i32, i32* %1
ret i32 %26
}

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
%8 = icmp eq i32 %6, 0
%9 = select i1 %7, i1 %8, i1 false
br i1 %9, label %10, label %12
10: ; preds = %4
%11 = tail call i32 @putchar(i32 32)
br label %12
12: ; preds = %10, %4
%13 = phi i32 [ 1, %10 ], [ %6, %4 ]
br i1 %7, label %16, label %14
14: ; preds = %12
%15 = tail call i32 @putchar(i32 %5)
br label %16
16: ; preds = %14, %12
%17 = phi i32 [ 0, %14 ], [ %13, %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
}