#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, p;
  while ((c = getchar()) != EOF) {
    if (c == ' ' && p != ' ')
      putchar(c);
    if (c != ' ')
      putchar(c);
    p = c;
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2ea8(%rip),%rcx
cmp    (%rcx),%eax
je     1181 <main+0x61>
cmpl   $0x20,-0x8(%rbp)
jne    1164 <main+0x44>
cmpl   $0x20,-0xc(%rbp)
je     1164 <main+0x44>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
cmpl   $0x20,-0x8(%rbp)
je     1176 <main+0x56>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
jmp    112f <main+0xf>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
xor    %eax,%eax
call   1040 <getchar@plt>
mov    0x2eb6(%rip),%r14
cmp    (%r14),%eax
jne    1141 <main+0x21>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
jmp    115e <main+0x3e>
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %ebx,%ecx
cmp    (%r14),%eax
je     1137 <main+0x17>
mov    %eax,%ebx
cmp    $0x20,%eax
jne    1174 <main+0x54>
cmp    $0x20,%ecx
je     1174 <main+0x54>
mov    $0x20,%edi
call   1030 <putchar@plt>
cmp    $0x20,%ebx
je     1150 <main+0x30>
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
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 %25
8: ; preds = %4
%9 = load i32, i32* %2
%10 = icmp eq i32 %9, 32
br i1 %10, label %11, label %17
11: ; preds = %8
%12 = load i32, i32* %3
%13 = icmp ne i32 %12, 32
br i1 %13, label %14, label %17
14: ; preds = %11
%15 = load i32, i32* %2
%16 = call i32 @putchar(i32 %15)
br label %17
17: ; preds = %14, %11, %8
%18 = load i32, i32* %2
%19 = icmp ne i32 %18, 32
br i1 %19, label %20, label %23
20: ; preds = %17
%21 = load i32, i32* %2
%22 = call i32 @putchar(i32 %21)
br label %23
23: ; preds = %20, %17
%24 = load i32, i32* %2
store i32 %24, i32* %3
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 %19, label %4
4: ; preds = %0, %15
%5 = phi i32 [ %16, %15 ], [ %1, %0 ]
%6 = phi i32 [ %5, %15 ], [ undef, %0 ]
%7 = icmp eq i32 %5, 32
%8 = icmp ne i32 %6, 32
%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
br i1 %7, label %15, label %13
13: ; preds = %12
%14 = tail call i32 @putchar(i32 %5)
br label %15
15: ; preds = %13, %12
%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 = %15, %0
ret i32 0
}