#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 uint8_t;

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
void debug_bytes(uint8_t *buf, int len) {
  int i;
  for (i = 0; i < len; i++) {
    printf("%02X ", buf[i]);
    if ((i + 1) % 16 == 0) {
      printf("\n");
    }
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<debug_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    1183 <debug_bytes+0x73>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
mov    (%rax,%rcx,4),%esi
lea    0xebc(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    $0x10,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1170 <debug_bytes+0x60>
lea    0xe9d(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1175 <debug_bytes+0x65>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1126 <debug_bytes+0x16>
lea    0xe7c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<debug_bytes>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %esi,%esi
jle    1182 <debug_bytes+0x62>
mov    %rdi,%r15
mov    %esi,%r12d
neg    %r12
mov    $0x1,%ebx
lea    0xebf(%rip),%r14
jmp    1162 <debug_bytes+0x42>
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
lea    (%r12,%rbx,1),%rax
add    $0x1,%rax
add    $0x1,%rbx
cmp    $0x1,%rax
je     1182 <debug_bytes+0x62>
mov    -0x4(%r15,%rbx,4),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   $0xf,%bl
jne    1150 <debug_bytes+0x30>
mov    $0xa,%edi
call   1030 <putchar@plt>
jmp    1150 <debug_bytes+0x30>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

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

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