#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 EXIT_SUCCESS;
int getchar();
int /*<<< orphan*/ putchar(int);
int main(void) {
  int character = 0;
  int previous_character = 0;
  while ((character = getchar()) != EOF) {
    if (!((previous_character == ' ') && (character == ' '))) {
      putchar(character);
      previous_character = character;
    }
  }
  return EXIT_SUCCESS;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
movl   $0x0,-0xc(%rbp)
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2e9a(%rip),%rcx
cmp    (%rcx),%eax
je     117d <main+0x5d>
cmpl   $0x20,-0xc(%rbp)
jne    116a <main+0x4a>
cmpl   $0x20,-0x8(%rbp)
je     1178 <main+0x58>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
jmp    113d <main+0x1d>
mov    0x2e54(%rip),%rax
mov    (%rax),%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    1148 <main+0x28>
mov    0x2e9a(%rip),%rax
mov    (%rax),%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
xor    %ebx,%ebx
jmp    1163 <main+0x43>
nopl   0x0(%rax)
mov    %ebx,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1040 <getchar@plt>
cmp    (%r14),%eax
je     1137 <main+0x17>
mov    %ebx,%ecx
mov    %eax,%ebx
cmp    $0x20,%ecx
jne    1150 <main+0x30>
cmp    $0x20,%ebx
je     1157 <main+0x37>
jmp    1150 <main+0x30>

LLVM IR (-O0):
@EOF = global i32 0
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %2
store i32 0, i32* %3
br label %4
4: ; preds = %18, %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 %19
8: ; preds = %4
%9 = load i32, i32* %3
%10 = icmp eq i32 %9, 32
br i1 %10, label %11, label %14
11: ; preds = %8
%12 = load i32, i32* %2
%13 = icmp eq i32 %12, 32
br i1 %13, label %18, label %14
14: ; preds = %11, %8
%15 = load i32, i32* %2
%16 = call i32 @putchar(i32 %15)
%17 = load i32, i32* %2
store i32 %17, i32* %3
br label %18
18: ; preds = %14, %11
br label %4
19: ; preds = %4
%20 = load i32, i32* @EXIT_SUCCESS
ret i32 %20
}

LLVM IR (-O2):
@EOF = global i32 0
@EXIT_SUCCESS = 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 %16, label %4
4: ; preds = %0, %12
%5 = phi i32 [ %13, %12 ], [ %1, %0 ]
%6 = phi i32 [ %5, %12 ], [ 0, %0 ]
%7 = icmp eq i32 %6, 32
%8 = icmp eq i32 %5, 32
%9 = and i1 %7, %8
br i1 %9, label %12, label %10
10: ; preds = %4
%11 = tail call i32 @putchar(i32 %5)
br label %12
12: ; preds = %4, %10
%13 = tail call i32 (...) @getchar()
%14 = load i32, i32* @EOF
%15 = icmp eq i32 %13, %14
br i1 %15, label %16, label %4
16: ; preds = %12, %0
%17 = load i32, i32* @EXIT_SUCCESS
ret i32 %17
}