#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*/ printf(char *);
int /*<<< orphan*/ putchar(int);
int main(void) {
  int c;
  int blank = 0;
  while ((c = getchar()) != EOF) {
    if (c == ' ') {
      if (!blank) {
        putchar(c);
        blank = 1;
      }
    } else {
      putchar(c);
      blank = 0;
    }
  }
  printf("\n");
}


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   1050 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2e91(%rip),%rcx
cmp    (%rcx),%eax
je     119b <main+0x6b>
cmpl   $0x20,-0x8(%rbp)
jne    1187 <main+0x57>
cmpl   $0x0,-0xc(%rbp)
jne    1182 <main+0x52>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
movl   $0x1,-0xc(%rbp)
jmp    1196 <main+0x66>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
movl   $0x0,-0xc(%rbp)
jmp    1146 <main+0x16>
lea    0xe5e(%rip),%rdi
call   1040 <printf@plt>
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    1148 <main+0x28>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret
xor    %ecx,%ecx
jmp    1164 <main+0x44>
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
@.str = [2 x i8] c"\0A\00"
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 = %21, %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 eq i32 %9, 32
br i1 %10, label %11, label %18
11: ; preds = %8
%12 = load i32, i32* %3
%13 = icmp ne i32 %12, 0
br i1 %13, label %17, label %14
14: ; preds = %11
%15 = load i32, i32* %2
%16 = call i32 @putchar(i32 %15)
store i32 1, i32* %3
br label %17
17: ; preds = %14, %11
br label %21
18: ; preds = %8
%19 = load i32, i32* %2
%20 = call i32 @putchar(i32 %19)
store i32 0, i32* %3
br label %21
21: ; preds = %18, %17
br label %4
22: ; preds = %4
%23 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%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
%20 = tail call i32 @putchar(i32 10)
ret i32 0
}