#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, b;
  b = 0;
  while ((c = getchar()) != EOF) {
    if (c != ' ') {
      if (b == 1) {
        putchar(' ');
        b = 0;
      }
      putchar(c);
    }
    if (c == ' ')
      b = 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     1192 <main+0x72>
cmpl   $0x20,-0x8(%rbp)
je     117c <main+0x5c>
cmpl   $0x1,-0xc(%rbp)
jne    1174 <main+0x54>
mov    $0x20,%edi
call   1030 <putchar@plt>
movl   $0x0,-0xc(%rbp)
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
cmpl   $0x20,-0x8(%rbp)
jne    118d <main+0x6d>
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   %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    %eax,%eax
jmp    1169 <main+0x49>
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    %ebx,%edi
call   1030 <putchar@plt>
xor    %ebp,%ebp
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %eax,%ebx
mov    %ebp,%eax
cmp    (%r14),%ebx
je     1137 <main+0x17>
mov    $0x1,%ebp
cmp    $0x20,%ebx
je     1159 <main+0x39>
cmp    $0x1,%eax
jne    1150 <main+0x30>
mov    $0x20,%edi
call   1030 <putchar@plt>
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
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 %19
11: ; preds = %8
%12 = load i32, i32* %3
%13 = icmp eq i32 %12, 1
br i1 %13, label %14, label %16
14: ; preds = %11
%15 = call i32 @putchar(i32 32)
store i32 0, i32* %3
br label %16
16: ; preds = %14, %11
%17 = load i32, i32* %2
%18 = call i32 @putchar(i32 %17)
br label %19
19: ; preds = %16, %8
%20 = load i32, i32* %2
%21 = icmp eq i32 %20, 32
br i1 %21, label %22, label %23
22: ; preds = %19
store i32 1, i32* %3
br label %23
23: ; preds = %22, %19
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 %19, label %4
4: ; preds = %0, %14
%5 = phi i32 [ %16, %14 ], [ %1, %0 ]
%6 = phi i32 [ %15, %14 ], [ 0, %0 ]
%7 = icmp eq i32 %5, 32
br i1 %7, label %14, label %8
8: ; preds = %4
%9 = icmp eq i32 %6, 1
br i1 %9, label %10, label %12
10: ; preds = %8
%11 = tail call i32 @putchar(i32 32)
br label %12
12: ; preds = %10, %8
%13 = tail call i32 @putchar(i32 %5)
br label %14
14: ; preds = %12, %4
%15 = phi i32 [ 0, %12 ], [ 1, %4 ]
%16 = tail call i32 (...) @getchar()
%17 = load i32, i32* @EOF
%18 = icmp eq i32 %16, %17
br i1 %18, label %19, label %4
19: ; preds = %14, %0
ret i32 0
}