#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;
  char lc = 0;
  while ((c = getchar()) != EOF) {
    if (c != ' ' || !lc) {
      putchar(c);
    }
    lc = c == ' ';
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movb   $0x0,-0x9(%rbp)
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2ea4(%rip),%rcx
cmp    (%rcx),%eax
je     117c <main+0x5c>
cmpl   $0x20,-0x8(%rbp)
jne    1160 <main+0x40>
cmpb   $0x0,-0x9(%rbp)
jne    1168 <main+0x48>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
cmpl   $0x20,-0x8(%rbp)
sete   %al
and    $0x1,%al
movzbl %al,%eax
mov    %al,-0x9(%rbp)
jmp    1133 <main+0x13>
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    %ebp,%ebp
jmp    116c <main+0x4c>
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    %ebx,%edi
call   1030 <putchar@plt>
cmp    $0x20,%ebx
sete   %bpl
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %eax,%ebx
cmp    (%r14),%eax
je     1137 <main+0x17>
test   %bpl,%bpl
je     1150 <main+0x30>
cmp    $0x20,%ebx
je     1157 <main+0x37>
jmp    1150 <main+0x30>

LLVM IR (-O0):
@EOF = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i8
store i32 0, i32* %1
store i8 0, i8* %3
br label %4
4: ; preds = %17, %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 %22
8: ; preds = %4
%9 = load i32, i32* %2
%10 = icmp ne i32 %9, 32
br i1 %10, label %14, label %11
11: ; preds = %8
%12 = load i8, i8* %3
%13 = icmp ne i8 %12, 0
br i1 %13, label %17, label %14
14: ; preds = %11, %8
%15 = load i32, i32* %2
%16 = call i32 @putchar(i32 %15)
br label %17
17: ; preds = %14, %11
%18 = load i32, i32* %2
%19 = icmp eq i32 %18, 32
%20 = zext i1 %19 to i32
%21 = trunc i32 %20 to i8
store i8 %21, i8* %3
br label %4
22: ; 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 %17, label %4
4: ; preds = %0, %12
%5 = phi i32 [ %14, %12 ], [ %1, %0 ]
%6 = phi i8 [ %13, %12 ], [ 0, %0 ]
%7 = icmp eq i32 %5, 32
%8 = icmp ne i8 %6, 0
%9 = and i1 %8, %7
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 = zext i1 %7 to i8
%14 = tail call i32 (...) @getchar()
%15 = load i32, i32* @EOF
%16 = icmp eq i32 %14, %15
br i1 %16, label %17, label %4
17: ; preds = %12, %0
ret i32 0
}