#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 print_packed(char *addr) {
  int i = 0;
  for (; i < 16; i++) {
    printf("%02x", *(unsigned char *)(addr + i));
    if ((i % 2) && i < 15)
      printf(":");
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<print_packed>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
movl   $0x0,-0xc(%rbp)
cmpl   $0x10,-0xc(%rbp)
jge    1186 <print_packed+0x76>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xec0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
je     1173 <print_packed+0x63>
cmpl   $0xf,-0xc(%rbp)
jge    1173 <print_packed+0x63>
lea    0xe99(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1178 <print_packed+0x68>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1123 <print_packed+0x13>
lea    0xe7a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_packed>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r15
lea    0xed1(%rip),%r14
xor    %ebx,%ebx
jmp    114a <print_packed+0x2a>
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
add    $0x1,%rbx
cmp    $0x10,%rbx
je     1175 <print_packed+0x55>
movzbl (%r15,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
cmp    $0xf,%rbx
je     1140 <print_packed+0x20>
mov    %ebx,%eax
and    $0x1,%eax
test   %rax,%rax
je     1140 <print_packed+0x20>
mov    $0x3a,%edi
call   1030 <putchar@plt>
jmp    1140 <print_packed+0x20>
mov    $0xa,%edi
pop    %rbx
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [5 x i8] c"%02x\00"
@.str.1 = [2 x i8] c":\00"
@.str.2 = [2 x i8] c"\0A\00"
define void @print_packed(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
store i8* %0, i8** %2
store i32 0, i32* %3
br label %4
4: ; preds = %24, %1
%5 = load i32, i32* %3
%6 = icmp slt i32 %5, 16
br i1 %6, label %7, label %27
7: ; preds = %4
%8 = load i8*, i8** %2
%9 = load i32, i32* %3
%10 = sext i32 %9 to i64
%11 = getelementptr inbounds i8, i8* %8, i64 %10
%12 = load i8, i8* %11
%13 = zext i8 %12 to i32
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %13)
%15 = load i32, i32* %3
%16 = srem i32 %15, 2
%17 = icmp ne i32 %16, 0
br i1 %17, label %18, label %23
18: ; preds = %7
%19 = load i32, i32* %3
%20 = icmp slt i32 %19, 15
br i1 %20, label %21, label %23
21: ; preds = %18
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %23
23: ; preds = %21, %18, %7
br label %24
24: ; preds = %23
%25 = load i32, i32* %3
%26 = add nsw i32 %25, 1
store i32 %26, i32* %3
br label %4
27: ; preds = %4
%28 = 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 = [5 x i8] c"%02x\00"
define void @print_packed(i8* nocapture %0) {
br label %2
2: ; preds = %1, %14
%3 = phi i64 [ 0, %1 ], [ %15, %14 ]
%4 = getelementptr inbounds i8, i8* %0, i64 %3
%5 = load i8, i8* %4
%6 = zext i8 %5 to i32
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %6)
%8 = and i64 %3, 1
%9 = icmp ne i64 %8, 0
%10 = icmp ne i64 %3, 15
%11 = and i1 %10, %9
br i1 %11, label %12, label %14
12: ; preds = %2
%13 = tail call i32 @putchar(i32 58)
br label %14
14: ; preds = %2, %12
%15 = add nuw nsw i64 %3, 1
%16 = icmp eq i64 %15, 16
br i1 %16, label %17, label %2
17: ; preds = %14
%18 = tail call i32 @putchar(i32 10)
ret void
}