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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_INT_LOG2_H_
#define LSP_PLUG_IN_COMMON_ARCH_GENERIC_BITS_INT_LOG2_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
{
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));
}
} /* namespace lsp */
#endif /* LSP_PLUG_IN_COMMON_ARCH_GENERIC_BITS_INT_LOG2_H_ */
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