#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 /*<<< orphan*/ printf(char *, ...);
void dec2bin(char *hint, int dec) {
  int bit = 1;
  printf("%s: %3d_{10}\n", hint, dec);
  printf("  %3d_{10} <=> ", dec);
  for (int i = 0; i < 8; i++) {
    printf("%d", (dec & (bit << (7 - i)) ? 1 : 0));
  }
  printf("_{2}\n");
}


x86 assembly (clang, -O0):
<dec2bin>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
movl   $0x1,-0x10(%rbp)
mov    -0x8(%rbp),%rsi
mov    -0xc(%rbp),%edx
lea    0xecc(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%esi
lea    0xec9(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x14(%rbp)
cmpl   $0x8,-0x14(%rbp)
jge    119e <dec2bin+0x8e>
mov    -0xc(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x10(%rbp),%eax
mov    $0x7,%ecx
sub    -0x14(%rbp),%ecx
shl    %cl,%eax
mov    -0x18(%rbp),%ecx
and    %eax,%ecx
xor    %esi,%esi
mov    $0x1,%eax
cmp    $0x0,%ecx
cmovne %eax,%esi
lea    0xe95(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1153 <dec2bin+0x43>
lea    0xe7c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<dec2bin>:
push   %r14
push   %rbx
push   %rax
mov    %esi,%ebx
mov    %rdi,%rsi
lea    0xed0(%rip),%rdi
mov    %ebx,%edx
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xece(%rip),%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%esi
shr    $0x7,%esi
and    $0x1,%esi
lea    0xec6(%rip),%r14
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%esi
shr    $0x6,%esi
and    $0x1,%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%esi
shr    $0x5,%esi
and    $0x1,%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%esi
shr    $0x4,%esi
and    $0x1,%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%esi
shr    $0x3,%esi
and    $0x1,%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%esi
shr    $0x2,%esi
and    $0x1,%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%esi
shr    %esi
and    $0x1,%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
and    $0x1,%ebx
mov    %r14,%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe3e(%rip),%rdi
add    $0x8,%rsp
pop    %rbx
pop    %r14
jmp    1030 <puts@plt>

LLVM IR (-O0):
@.str = [14 x i8] c"%s: %3d_{10}\0A\00"
@.str.1 = [16 x i8] c" %3d_{10} <=> \00"
@.str.2 = [3 x i8] c"%d\00"
@.str.3 = [6 x i8] c"_{2}\0A\00"
define void @dec2bin(i8* %0, i32 %1) {
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
store i8* %0, i8** %3
store i32 %1, i32* %4
store i32 1, i32* %5
%7 = load i8*, i8** %3
%8 = load i32, i32* %4
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i8* %7, i32 %8)
%10 = load i32, i32* %4
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), i32 %10)
store i32 0, i32* %6
br label %12
12: ; preds = %26, %2
%13 = load i32, i32* %6
%14 = icmp slt i32 %13, 8
br i1 %14, label %15, label %29
15: ; preds = %12
%16 = load i32, i32* %4
%17 = load i32, i32* %5
%18 = load i32, i32* %6
%19 = sub nsw i32 7, %18
%20 = shl i32 %17, %19
%21 = and i32 %16, %20
%22 = icmp ne i32 %21, 0
%23 = zext i1 %22 to i64
%24 = select i1 %22, i32 1, i32 0
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %24)
br label %26
26: ; preds = %15
%27 = load i32, i32* %6
%28 = add nsw i32 %27, 1
store i32 %28, i32* %6
br label %12
29: ; preds = %12
%30 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str = [14 x i8] c"%s: %3d_{10}\0A\00"
@.str.1 = [16 x i8] c" %3d_{10} <=> \00"
@.str.2 = [3 x i8] c"%d\00"
@str = [5 x i8] c"_{2}\00"
define void @dec2bin(i8* %0, i32 %1) {
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i8* %0, i32 %1)
%4 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), i32 %1)
%5 = lshr i32 %1, 7
%6 = and i32 %5, 1
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %6)
%8 = lshr i32 %1, 6
%9 = and i32 %8, 1
%10 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %9)
%11 = lshr i32 %1, 5
%12 = and i32 %11, 1
%13 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %12)
%14 = lshr i32 %1, 4
%15 = and i32 %14, 1
%16 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %15)
%17 = lshr i32 %1, 3
%18 = and i32 %17, 1
%19 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %18)
%20 = lshr i32 %1, 2
%21 = and i32 %20, 1
%22 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %21)
%23 = lshr i32 %1, 1
%24 = and i32 %23, 1
%25 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %24)
%26 = and i32 %1, 1
%27 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32 %26)
%28 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @str, i64 0, i64 0))
ret void
}