#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(const unsigned char *data, size_t len) {
  size_t i;
  for (i = 0; i < len; i++) {
    if (i > 0) {
      printf(":");
    }
    printf("%02X", data[i]);
  }
}


x86 assembly (clang, -O0):
<print_hex>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movq   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%rax
cmp    -0x10(%rbp),%rax
jae    117a <print_hex+0x6a>
cmpq   $0x0,-0x18(%rbp)
jbe    114f <print_hex+0x3f>
lea    0xeb8(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xea0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    1128 <print_hex+0x18>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_hex>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %rsi,%rsi
je     1182 <print_hex+0x62>
mov    %rsi,%r12
mov    %rdi,%r14
movzbl (%rdi),%esi
lea    0xec3(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
cmp    $0x1,%r12
je     1182 <print_hex+0x62>
mov    $0x1,%ebx
lea    0xeaa(%rip),%r15
cs nopw 0x0(%rax,%rax,1)
mov    $0x3a,%edi
call   1030 <putchar@plt>
movzbl (%r14,%rbx,1),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1160 <print_hex+0x40>
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

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

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