#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);
main() {
  int i, c;
  while ((c = getchar()) != EOF) {
    if (c == '\t')
      for (i = 0; i < 4; ++i)
        putchar(' ');
    else
      putchar(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,-0xc(%rbp)
mov    0x2ea8(%rip),%rcx
cmp    (%rcx),%eax
je     118d <main+0x6d>
cmpl   $0x9,-0xc(%rbp)
jne    1180 <main+0x60>
movl   $0x0,-0x8(%rbp)
cmpl   $0x4,-0x8(%rbp)
jge    117b <main+0x5b>
mov    $0x20,%edi
call   1030 <putchar@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1159 <main+0x39>
jmp    1188 <main+0x68>
mov    -0xc(%rbp),%edi
call   1030 <putchar@plt>
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
mov    %eax,%ebx
jmp    1165 <main+0x45>
cs nopw 0x0(%rax,%rax,1)
nop
mov    %ebx,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %eax,%ebx
cmp    (%r14),%eax
je     1137 <main+0x17>
cmp    $0x9,%ebx
jne    1150 <main+0x30>
mov    $0x20,%ebx
mov    $0x20,%edi
call   1030 <putchar@plt>
mov    $0x20,%edi
call   1030 <putchar@plt>
mov    $0x20,%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 = %24, %0
%5 = call i32 (...) @getchar()
store i32 %5, i32* %3
%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* %3
%10 = icmp eq i32 %9, 9
br i1 %10, label %11, label %21
11: ; preds = %8
store i32 0, i32* %2
br label %12
12: ; preds = %17, %11
%13 = load i32, i32* %2
%14 = icmp slt i32 %13, 4
br i1 %14, label %15, label %20
15: ; preds = %12
%16 = call i32 @putchar(i32 32)
br label %17
17: ; preds = %15
%18 = load i32, i32* %2
%19 = add nsw i32 %18, 1
store i32 %19, i32* %2
br label %12
20: ; preds = %12
br label %24
21: ; preds = %8
%22 = load i32, i32* %3
%23 = call i32 @putchar(i32 %22)
br label %24
24: ; preds = %21, %20
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 %17, label %4
4: ; preds = %0, %11
%5 = phi i32 [ %14, %11 ], [ %1, %0 ]
%6 = icmp eq i32 %5, 9
br i1 %6, label %7, label %11
7: ; preds = %4
%8 = tail call i32 @putchar(i32 32)
%9 = tail call i32 @putchar(i32 32)
%10 = tail call i32 @putchar(i32 32)
br label %11
11: ; preds = %4, %7
%12 = phi i32 [ 32, %7 ], [ %5, %4 ]
%13 = tail call i32 @putchar(i32 %12)
%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 = %11, %0
ret i32 0
}