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


x86 assembly (clang, -O0):
<printBytes>:
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    1172 <printBytes+0x62>
cmpl   $0x0,-0x10(%rbp)
jle    114a <printBytes+0x3a>
lea    0xebd(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xea5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1126 <printBytes+0x16>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<printBytes>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
test   %esi,%esi
jle    1182 <printBytes+0x62>
mov    %esi,%ebp
mov    %rdi,%r15
movzbl (%rdi),%esi
lea    0xec6(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
cmp    $0x1,%ebp
je     1182 <printBytes+0x62>
mov    %ebp,%ebp
mov    $0x1,%ebx
lea    0xeac(%rip),%r14
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    $0x20,%edi
call   1030 <putchar@plt>
movzbl (%r15,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1160 <printBytes+0x40>
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

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

LLVM IR (-O2):
@.str.1 = [5 x i8] c"%02X\00"
define void @printBytes(i8* nocapture %0, i32 %1) {
%3 = icmp sgt i32 %1, 0
br i1 %3, label %4, label %10
4: ; preds = %2
%5 = zext i32 %1 to i64
%6 = load i8, i8* %0
%7 = zext i8 %6 to i32
%8 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 %7)
%9 = icmp eq i32 %1, 1
br i1 %9, label %10, label %11
10: ; preds = %11, %4, %2
ret void
11: ; preds = %4, %11
%12 = phi i64 [ %18, %11 ], [ 1, %4 ]
%13 = tail call i32 @putchar(i32 32)
%14 = getelementptr inbounds i8, i8* %0, i64 %12
%15 = load i8, i8* %14
%16 = zext i8 %15 to i32
%17 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 %16)
%18 = add nuw nsw i64 %12, 1
%19 = icmp eq i64 %18, %5
br i1 %19, label %10, label %11
}