140 lines
4.7 KiB
C++
140 lines
4.7 KiB
C++
// =====================================================================================================================
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// fennec, a free and open source game engine
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// Copyright © 2025 Medusa Slockbower
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// =====================================================================================================================
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#ifndef FENNEC_LANG_DETAIL_BITS_H
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#define FENNEC_LANG_DETAIL_BITS_H
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#include <fennec/lang/types.h>
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namespace fennec::detail
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{
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// helper for bitwise and for 1 byte
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constexpr size_t _bit_and_8(void* dst, const void* src) {
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*static_cast<uint8_t*>(dst) = *static_cast<uint8_t*>(dst) & *static_cast<const uint8_t*>(src); return 1;
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}
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// helper for bitwise and 2 bytes at once
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constexpr size_t _bit_and_16(void* dst, const void* src) {
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*static_cast<uint16_t*>(dst) = *static_cast<uint16_t*>(dst) & *static_cast<const uint16_t*>(src); return 2;
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}
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// helper for bitwise and 4 bytes at once
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constexpr size_t _bit_and_32(void* dst, const void* src) {
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*static_cast<uint32_t*>(dst) = *static_cast<uint32_t*>(dst) & *static_cast<const uint32_t*>(src); return 4;
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}
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// helper for bitwise and 8 bytes at once
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constexpr size_t _bit_and_64(void* dst, const void* src) {
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*static_cast<uint64_t*>(dst) = *static_cast<uint64_t*>(dst) & *static_cast<const uint64_t*>(src); return 8;
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}
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// helper for selecting size
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constexpr size_t _bit_and(void* dst, const void* src, size_t n) {
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switch (n) {
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case 0:
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return 0;
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case 1:
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return _bit_and_8(dst, src);
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case 2: case 3:
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return _bit_and_16(dst, src);
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case 4: case 5: case 6: case 7:
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return _bit_and_32(dst, src);
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default:
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return _bit_and_64(dst, src);
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}
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}
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// helper for bitwise or for 1 byte
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constexpr size_t _bit_or_8(void* dst, const void* src) {
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*static_cast<uint8_t*>(dst) = *static_cast<uint8_t*>(dst) | *static_cast<const uint8_t*>(src); return 1;
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}
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// helper for bitwise or 2 bytes at once
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constexpr size_t _bit_or_16(void* dst, const void* src) {
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*static_cast<uint16_t*>(dst) = *static_cast<uint16_t*>(dst) | *static_cast<const uint16_t*>(src); return 2;
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}
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// helper for bitwise or 4 bytes at once
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constexpr size_t _bit_or_32(void* dst, const void* src) {
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*static_cast<uint32_t*>(dst) = *static_cast<uint32_t*>(dst) | *static_cast<const uint32_t*>(src); return 4;
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}
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// helper for bitwise or 8 bytes at once
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constexpr size_t _bit_or_64(void* dst, const void* src) {
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*static_cast<uint64_t*>(dst) = *static_cast<uint64_t*>(dst) | *static_cast<const uint64_t*>(src); return 8;
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}
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// helper for selecting size
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constexpr size_t _bit_or(void* dst, const void* src, size_t n) {
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switch (n) {
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case 0:
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return 0;
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case 1:
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return _bit_or_8(dst, src);
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case 2: case 3:
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return _bit_or_16(dst, src);
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case 4: case 5: case 6: case 7:
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return _bit_or_32(dst, src);
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default:
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return _bit_or_64(dst, src);
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}
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}
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// helper for bitwise and 1 byte
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constexpr size_t _bit_xor_8(void* dst, const void* src) {
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*static_cast<uint8_t*>(dst) = *static_cast<uint8_t*>(dst) ^ *static_cast<const uint8_t*>(src); return 1;
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}
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// helper for bitwise xor 2 bytes at once
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constexpr size_t _bit_xor_16(void* dst, const void* src) {
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*static_cast<uint16_t*>(dst) = *static_cast<uint16_t*>(dst) ^ *static_cast<const uint16_t*>(src); return 2;
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}
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// helper for bitwise xor 4 bytes at once
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constexpr size_t _bit_xor_32(void* dst, const void* src) {
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*static_cast<uint32_t*>(dst) = *static_cast<uint32_t*>(dst) ^ *static_cast<const uint32_t*>(src); return 4;
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}
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// helper for bitwise xor 8 bytes at once
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constexpr size_t _bit_xor_64(void* dst, const void* src) {
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*static_cast<uint64_t*>(dst) = *static_cast<uint64_t*>(dst) ^ *static_cast<const uint64_t*>(src); return 8;
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}
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// helper for selecting size
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constexpr size_t _bit_xor(void* dst, const void* src, size_t n) {
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switch (n) {
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case 0:
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return 0;
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case 1:
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return _bit_xor_8(dst, src);
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case 2: case 3:
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return _bit_xor_16(dst, src);
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case 4: case 5: case 6: case 7:
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return _bit_xor_32(dst, src);
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default:
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return _bit_xor_64(dst, src);
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}
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}
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}
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#endif // FENNEC_LANG_DETAIL_BITS_H
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