#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_hex(unsigned char *p, int len) {
  int i;
  for (i = 0; i < len; i++) {
    printf("%02X", p[i]);
    if (i != len - 1)
      printf(":");
  }
}


x86 assembly (clang, -O0):
<print_hex>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
movl   $0x0,-0x10(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    117e <print_hex+0x6e>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xebb(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
mov    -0xc(%rbp),%ecx
sub    $0x1,%ecx
cmp    %ecx,%eax
je     116b <print_hex+0x5b>
lea    0xea1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1170 <print_hex+0x60>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1126 <print_hex+0x16>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_hex>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
test   %esi,%esi
jle    1179 <print_hex+0x59>
mov    %rdi,%r15
lea    -0x1(%rsi),%r12d
mov    %esi,%r13d
lea    0xec2(%rip),%r14
xor    %ebx,%ebx
jmp    1159 <print_hex+0x39>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
add    $0x1,%rbx
cmp    %rbx,%r13
je     1179 <print_hex+0x59>
movzbl (%r15,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
cmp    %rbx,%r12
je     1150 <print_hex+0x30>
mov    $0x3a,%edi
call   1030 <putchar@plt>
jmp    1150 <print_hex+0x30>
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

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

LLVM IR (-O2):
@.str = [5 x i8] c"%02X\00"
define void @print_hex(i8* nocapture %0, i32 %1) {
%3 = icmp sgt i32 %1, 0
br i1 %3, label %4, label %20
4: ; preds = %2
%5 = add nsw i32 %1, -1
%6 = zext i32 %5 to i64
%7 = zext i32 %1 to i64
br label %8
8: ; preds = %4, %17
%9 = phi i64 [ 0, %4 ], [ %18, %17 ]
%10 = getelementptr inbounds i8, i8* %0, i64 %9
%11 = load i8, i8* %10
%12 = zext i8 %11 to i32
%13 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %12)
%14 = icmp eq i64 %9, %6
br i1 %14, label %17, label %15
15: ; preds = %8
%16 = tail call i32 @putchar(i32 58)
br label %17
17: ; preds = %8, %15
%18 = add nuw nsw i64 %9, 1
%19 = icmp eq i64 %18, %7
br i1 %19, label %20, label %8
20: ; preds = %17, %2
ret void
}