mirror of
https://github.com/sendyne/cppreg.git
synced 2026-01-19 04:52:08 +00:00
95288090d4
Register sizes are now represented by an enumeration type. This limits the possibility to typeset unsupported register sizes, and make the interface easier to read. See #12.
59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
//! Bit mask implementation.
|
|
/**
|
|
* @file Mask.h
|
|
* @author Nicolas Clauvelin (nclauvelin@sendyne.com)
|
|
* @copyright Copyright 2010-2018 Sendyne Corp. All rights reserved.
|
|
*
|
|
* The implementation is designed to compute masks prior to runtime by
|
|
* relying on constexpr function. This will work as intended if the function
|
|
* argument is known at compile time, otherwise it will be evaluated at runtime.
|
|
*/
|
|
|
|
|
|
#ifndef CPPREG_MASK_H
|
|
#define CPPREG_MASK_H
|
|
|
|
|
|
#include "cppreg_Defines.h"
|
|
|
|
|
|
//! cppreg namespace.
|
|
namespace cppreg {
|
|
|
|
|
|
//! Mask constexpr function.
|
|
/**
|
|
* @tparam Mask_t Mask data type (will be derived from register).
|
|
* @param width Mask width.
|
|
* @return The mask value.
|
|
*/
|
|
template <typename Mask_t>
|
|
constexpr Mask_t make_mask(const FieldWidth_t width) noexcept {
|
|
return width == 0 ?
|
|
0u
|
|
:
|
|
static_cast<Mask_t>(
|
|
(make_mask<Mask_t>(FieldWidth_t(width - 1)) << 1) | 1
|
|
);
|
|
};
|
|
|
|
|
|
//! Shifted mask constexpr function.
|
|
/**
|
|
* @tparam Mask_t Mask data type (will be derived from register).
|
|
* @param width Mask width.
|
|
* @param offset Mask offset.
|
|
* @return The mask value.
|
|
*/
|
|
template <typename Mask_t>
|
|
constexpr Mask_t make_shifted_mask(const FieldWidth_t width,
|
|
const FieldOffset_t offset) noexcept {
|
|
return static_cast<Mask_t>(make_mask<Mask_t>(width) << offset);
|
|
};
|
|
|
|
|
|
}
|
|
|
|
|
|
#endif // CPPREG_MASK_H
|