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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-common-lib
* Created on: 1 апр. 2020 г.
*
* lsp-common-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-common-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-common-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_COMMON_ARCH_GENERIC_BITS_H_
#define LSP_PLUG_IN_COMMON_ARCH_GENERIC_BITS_H_
#ifndef LSP_PLUG_IN_COMMON_BITS_IMPL
#error "This file should not be included directly"
#endif /* LSP_PLUG_IN_COMMON_BITS_IMPL */
namespace lsp
{
// Unsigned implementation
inline uint8_t reverse_bits(uint8_t src)
{
return lsp_rb_data[src];
}
inline uint16_t reverse_bits(uint16_t v)
{
return (uint16_t(lsp_rb_data[v & 0xff]) << 8) | (uint16_t(lsp_rb_data[v >> 8]));
}
inline uint32_t reverse_bits(uint32_t v)
{
return
(uint32_t(lsp_rb_data[v >> 24])) |
(uint32_t(lsp_rb_data[(v >> 16) & 0xff]) << 8) |
(uint32_t(lsp_rb_data[(v >> 8) & 0xff]) << 16) |
(uint32_t(lsp_rb_data[v & 0xff]) << 24);
}
inline uint64_t reverse_bits(uint64_t v)
{
return
(uint64_t(lsp_rb_data[v >> 56])) |
(uint64_t(lsp_rb_data[(v >> 48) & 0xff]) << 8) |
(uint64_t(lsp_rb_data[(v >> 40) & 0xff]) << 16) |
(uint64_t(lsp_rb_data[(v >> 32) & 0xff]) << 24) |
(uint64_t(lsp_rb_data[(v >> 24) & 0xff]) << 32) |
(uint64_t(lsp_rb_data[(v >> 16) & 0xff]) << 40) |
(uint64_t(lsp_rb_data[(v >> 8) & 0xff]) << 48) |
(uint64_t(lsp_rb_data[v & 0xff]) << 56);
}
inline uint8_t reverse_bits(uint8_t v, size_t count)
{
return reverse_bits(v) >> (sizeof(uint8_t) * 8 - count);
}
inline uint16_t reverse_bits(uint16_t v, size_t count)
{
return reverse_bits(v) >> (sizeof(uint16_t) * 8 - count);
}
inline uint32_t reverse_bits(uint32_t v, size_t count)
{
return reverse_bits(v) >> (sizeof(uint32_t) * 8 - count);
}
inline uint64_t reverse_bits(uint64_t v, size_t count)
{
return reverse_bits(v) >> (sizeof(uint64_t) * 8 - count);
}
// Signed implementation
inline int8_t __lsp_forced_inline reverse_bits(int8_t v)
{
return reverse_bits(uint8_t(v));
}
inline int16_t __lsp_forced_inline reverse_bits(int16_t v)
{
return reverse_bits(uint16_t(v));
}
inline int32_t __lsp_forced_inline reverse_bits(int32_t v)
{
return reverse_bits(uint32_t(v));
}
inline int64_t __lsp_forced_inline reverse_bits(int64_t v)
{
return reverse_bits(uint64_t(v));
}
inline int8_t __lsp_forced_inline reverse_bits(int8_t v, size_t count)
{
return reverse_bits(uint8_t(v), count);
}
inline int16_t __lsp_forced_inline reverse_bits(int16_t v, size_t count)
{
return reverse_bits(uint16_t(v), count);
}
inline int32_t __lsp_forced_inline reverse_bits(int32_t v, size_t count)
{
return reverse_bits(uint32_t(v), count);
}
inline int64_t __lsp_forced_inline reverse_bits(int64_t v, size_t count)
{
return reverse_bits(uint64_t(v), count);
}
inline int __lsp_forced_inline int_log2(uint8_t v)
{
int res = 0;
if (v & 0xf0) { res += 4; v >>= 4; }
if (v & 0x0c) { res += 2; v >>= 2; }
if (v & 0x02) ++res;
return res;
}
inline int __lsp_forced_inline int_log2(uint16_t v)
{
int res = 0;
if (v & 0xff00) { res += 8; v >>= 8; }
if (v & 0xf0) { res += 4; v >>= 4; }
if (v & 0x0c) { res += 2; v >>= 2; }
if (v & 0x02) ++res;
return res;
}
inline int __lsp_forced_inline int_log2(uint32_t v)
{
int res = 0;
if (v & 0xffff0000) { res += 16; v >>= 16; }
if (v & 0xff00) { res += 8; v >>= 8; }
if (v & 0xf0) { res += 4; v >>= 4; }
if (v & 0x0c) { res += 2; v >>= 2; }
if (v & 0x02) ++res;
return res;
}
inline int __lsp_forced_inline int_log2(uint64_t v)
{
int res = 0;
if (v & 0xffffffff00000000ULL) { res += 32; v >>= 32; }
if (v & 0xffff0000) { res += 16; v >>= 16; }
if (v & 0xff00) { res += 8; v >>= 8; }
if (v & 0xf0) { res += 4; v >>= 4; }
if (v & 0x0c) { res += 2; v >>= 2; }
if (v & 0x02) ++res;
return res;
}
inline int __lsp_forced_inline int_log2(int8_t v)
{
return int_log2(uint8_t(v));
}
inline int __lsp_forced_inline int_log2(int16_t v)
{
return int_log2(uint16_t(v));
}
inline int __lsp_forced_inline int_log2(int32_t v)
{
return int_log2(uint32_t(v));
}
inline int __lsp_forced_inline int_log2(int64_t v)
{
return int_log2(uint64_t(v));
}
}
#endif /* LSP_PLUG_IN_COMMON_ARCH_GENERIC_BITS_H_ */
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