#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);
int main() {
  int c;
  int prev_was_blank = 0;
  while ((c = getchar()) != EOF) {
    if (c == ' ')
      prev_was_blank = 1;
    else if (prev_was_blank) {
      putchar(' ');
      putchar(c);
      prev_was_blank = 0;
    }
  }
  return 0;
}


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)
jne    1165 <main+0x45>
movl   $0x1,-0xc(%rbp)
jmp    118d <main+0x6d>
cmpl   $0x0,-0xc(%rbp)
je     1188 <main+0x68>
mov    $0x20,%edi
call   1030 <putchar@plt>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
movl   $0x0,-0xc(%rbp)
jmp    118d <main+0x6d>
jmp    1136 <main+0x16>
xor    %eax,%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    1160 <main+0x40>
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
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     1150 <main+0x30>
xor    %ebp,%ebp
test   %eax,%eax
je     1150 <main+0x30>
mov    $0x20,%edi
call   1030 <putchar@plt>
mov    %ebx,%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 = %20, %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 %21
8: ; preds = %4
%9 = load i32, i32* %2
%10 = icmp eq i32 %9, 32
br i1 %10, label %11, label %12
11: ; preds = %8
store i32 1, i32* %3
br label %20
12: ; preds = %8
%13 = load i32, i32* %3
%14 = icmp ne i32 %13, 0
br i1 %14, label %15, label %19
15: ; preds = %12
%16 = call i32 @putchar(i32 32)
%17 = load i32, i32* %2
%18 = call i32 @putchar(i32 %17)
store i32 0, i32* %3
br label %19
19: ; preds = %15, %12
br label %20
20: ; preds = %19, %11
br label %4
21: ; preds = %4
ret i32 0
}

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 %18, label %4
4: ; preds = %0, %13
%5 = phi i32 [ %15, %13 ], [ %1, %0 ]
%6 = phi i32 [ %14, %13 ], [ 0, %0 ]
%7 = icmp eq i32 %5, 32
br i1 %7, label %13, label %8
8: ; preds = %4
%9 = icmp eq i32 %6, 0
br i1 %9, label %13, label %10
10: ; preds = %8
%11 = tail call i32 @putchar(i32 32)
%12 = tail call i32 @putchar(i32 %5)
br label %13
13: ; preds = %4, %8, %10
%14 = phi i32 [ 0, %10 ], [ 0, %8 ], [ 1, %4 ]
%15 = tail call i32 (...) @getchar()
%16 = load i32, i32* @EOF
%17 = icmp eq i32 %15, %16
br i1 %17, label %18, label %4
18: ; preds = %13, %0
ret i32 0
}