#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 */
typedef int ssize_t;

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
void print_bytes(char *bytes, ssize_t n) {
  int i = 0;
  while (i < n) {
    printf("%02hhx ", bytes[i]);
    i++;
    if (i % 20 == 0) {
      printf("\n");
    }
  }
}


x86 assembly (clang, -O0):
<print_bytes>:
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    117c <print_bytes+0x6c>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movsbl (%rax,%rcx,1),%esi
lea    0xebb(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
mov    -0x10(%rbp),%eax
mov    $0x14,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1177 <print_bytes+0x67>
lea    0xe98(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1126 <print_bytes+0x16>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_bytes>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
test   %esi,%esi
jle    118d <print_bytes+0x6d>
mov    %rdi,%r15
mov    %esi,%r13d
mov    $0x1,%ebp
xor    %r12d,%r12d
jmp    1148 <print_bytes+0x28>
nop
add    $0x1,%ebp
cmp    %r12,%r13
je     118d <print_bytes+0x6d>
mov    %r12,%rbx
mov    %ebp,%eax
mov    $0xcccccccd,%ecx
imul   %rcx,%rax
shr    $0x24,%rax
lea    (%rax,%rax,4),%eax
lea    -0x1(,%rax,4),%r14d
ff
movsbl (%r15,%r12,1),%esi
lea    0xe8f(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%r12
cmp    %ebx,%r14d
jne    1140 <print_bytes+0x20>
mov    $0xa,%edi
call   1030 <putchar@plt>
jmp    1140 <print_bytes+0x20>
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

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

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