#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 */
typedef int uint8_t;

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
void print_binary_digits(uint8_t number, uint8_t digits) {
  printf("0b");
  for (int p = digits - 1; p >= 0; --p) {
    printf("%d", 1 & (number >> p));
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<print_binary_digits>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
mov    %esi,-0x8(%rbp)
lea    0xedb(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
sub    $0x1,%eax
mov    %eax,-0xc(%rbp)
cmpl   $0x0,-0xc(%rbp)
jl     1166 <print_binary_digits+0x56>
mov    -0x4(%rbp),%esi
mov    -0xc(%rbp),%ecx
sar    %cl,%esi
and    $0x1,%esi
lea    0xeb2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0xc(%rbp)
jmp    1135 <print_binary_digits+0x25>
lea    0xe99(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_binary_digits>:
push   %rbp
push   %r14
push   %rbx
mov    %esi,%ebx
mov    %edi,%ebp
lea    0xed1(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   %ebx,%ebx
jle    116c <print_binary_digits+0x4c>
add    $0x1,%ebx
lea    0xebf(%rip),%r14
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
lea    -0x2(%rbx),%ecx
mov    %ebp,%esi
shr    %cl,%esi
and    $0x1,%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0xffffffff,%ebx
cmp    $0x1,%ebx
ja     1150 <print_binary_digits+0x30>
mov    $0xa,%edi
pop    %rbx
pop    %r14
pop    %rbp
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [3 x i8] c"0b\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [2 x i8] c"\0A\00"
define void @print_binary_digits(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
store i32 %0, i32* %3
store i32 %1, i32* %4
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%7 = load i32, i32* %4
%8 = sub nsw i32 %7, 1
store i32 %8, i32* %5
br label %9
9: ; preds = %18, %2
%10 = load i32, i32* %5
%11 = icmp sge i32 %10, 0
br i1 %11, label %12, label %21
12: ; preds = %9
%13 = load i32, i32* %3
%14 = load i32, i32* %5
%15 = ashr i32 %13, %14
%16 = and i32 1, %15
%17 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32 %16)
br label %18
18: ; preds = %12
%19 = load i32, i32* %5
%20 = add nsw i32 %19, -1
store i32 %20, i32* %5
br label %9
21: ; preds = %9
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str = [3 x i8] c"0b\00"
@.str.1 = [3 x i8] c"%d\00"
define void @print_binary_digits(i32 %0, i32 %1) {
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%4 = icmp sgt i32 %1, 0
br i1 %4, label %7, label %5
5: ; preds = %7, %2
%6 = tail call i32 @putchar(i32 10)
ret void
7: ; preds = %2, %7
%8 = phi i32 [ %9, %7 ], [ %1, %2 ]
%9 = add nsw i32 %8, -1
%10 = lshr i32 %0, %9
%11 = and i32 %10, 1
%12 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32 %11)
%13 = icmp ugt i32 %8, 1
br i1 %13, label %7, label %5
}