#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 in_whitespace = 0;
  while ((c = getchar()) != EOF) {
    if (c == ' ') {
      if (in_whitespace) {
        continue;
      } else {
        in_whitespace = 1;
        putchar(c);
      }
    } else {
      in_whitespace = 0;
      putchar(c);
    }
  }
}


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     1190 <main+0x70>
cmpl   $0x20,-0x8(%rbp)
jne    117c <main+0x5c>
cmpl   $0x0,-0xc(%rbp)
je     1168 <main+0x48>
jmp    1136 <main+0x16>
movl   $0x1,-0xc(%rbp)
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    118b <main+0x6b>
movl   $0x0,-0xc(%rbp)
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
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    %ecx,%ecx
jmp    1164 <main+0x44>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
mov    %eax,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %ebp,%ecx
cmp    (%rbx),%eax
je     1135 <main+0x15>
xor    %ebp,%ebp
cmp    $0x20,%eax
jne    1150 <main+0x30>
mov    $0x1,%ebp
test   %ecx,%ecx
jne    1157 <main+0x37>
mov    $0x20,%eax
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 = %22, %14, %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 %23
8: ; preds = %4
%9 = load i32, i32* %2
%10 = icmp eq i32 %9, 32
br i1 %10, label %11, label %19
11: ; preds = %8
%12 = load i32, i32* %3
%13 = icmp ne i32 %12, 0
br i1 %13, label %14, label %15
14: ; preds = %11
br label %4
15: ; preds = %11
store i32 1, i32* %3
%16 = load i32, i32* %2
%17 = call i32 @putchar(i32 %16)
br label %18
18: ; preds = %15
br label %22
19: ; preds = %8
store i32 0, i32* %3
%20 = load i32, i32* %2
%21 = call i32 @putchar(i32 %20)
br label %22
22: ; preds = %19, %18
br label %4
23: ; preds = %4
%24 = load i32, i32* %1
ret i32 %24
}

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