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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_X86_BITS_INT_LOG2_H_
#define LSP_PLUG_IN_COMMON_ARCH_X86_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)
{
uint32_t res = v;
ARCH_X86_ASM (
__ASM_EMIT("bsr %[res], %[res]")
__ASM_EMIT("cmovz %[tmp], %[res]")
: [res] "+r" (res)
: [tmp] "r" (0)
: "cc"
);
return res;
}
inline int __lsp_forced_inline int_log2(int8_t v)
{
uint32_t res = uint8_t(v);
ARCH_X86_ASM (
__ASM_EMIT("bsr %[res], %[res]")
__ASM_EMIT("cmovz %[tmp], %[res]")
: [res] "+r" (res)
: [tmp] "r" (0)
: "cc"
);
return res;
}
inline int __lsp_forced_inline int_log2(uint16_t v)
{
uint32_t res = v;
ARCH_X86_ASM (
__ASM_EMIT("bsr %[res], %[res]")
__ASM_EMIT("cmovz %[tmp], %[res]")
: [res] "+r" (res)
: [tmp] "r" (0)
: "cc"
);
return res;
}
inline int __lsp_forced_inline int_log2(int16_t v)
{
uint32_t res = uint16_t(v);
ARCH_X86_ASM (
__ASM_EMIT("bsr %[res], %[res]")
__ASM_EMIT("cmovz %[tmp], %[res]")
: [res] "+r" (res)
: [tmp] "r" (0)
: "cc"
);
return res;
}
inline int __lsp_forced_inline int_log2(uint32_t v)
{
ARCH_X86_ASM (
__ASM_EMIT("bsr %[res], %[res]")
__ASM_EMIT("cmovz %[tmp], %[res]")
: [res] "+r" (v)
: [tmp] "r" (0)
: "cc"
);
return v;
}
inline int __lsp_forced_inline int_log2(int32_t v)
{
ARCH_X86_ASM (
__ASM_EMIT("bsr %[res], %[res]")
__ASM_EMIT("cmovz %[tmp], %[res]")
: [res] "+r" (v)
: [tmp] "r" (0)
: "cc"
);
return v;
}
#ifdef ARCH_X86_64
inline int __lsp_forced_inline int_log2(uint64_t v)
{
ARCH_X86_ASM (
__ASM_EMIT("bsr %[res], %[res]")
__ASM_EMIT("cmovz %q[tmp], %[res]")
: [res] "+r" (v)
: [tmp] "r" (0)
: "cc"
);
return int(v);
}
inline int __lsp_forced_inline int_log2(int64_t v)
{
ARCH_X86_ASM (
__ASM_EMIT("bsr %[res], %[res]")
__ASM_EMIT("cmovz %q[tmp], %[res]")
: [res] "+r" (v)
: [tmp] "r" (0)
: "cc"
);
return int(v);
}
#else
inline int __lsp_forced_inline int_log2(uint64_t v)
{
ARCH_X86_ASM (
__ASM_EMIT("test %%edx, %%edx")
__ASM_EMIT("jz 2f")
__ASM_EMIT("mov %%edx, %%eax")
__ASM_EMIT("xor %%edx, %%edx")
__ASM_EMIT("bsr %%eax, %%eax")
__ASM_EMIT("cmovz %%edx, %%eax")
__ASM_EMIT("add $32, %%eax")
__ASM_EMIT("jmp 4f")
__ASM_EMIT("2:")
__ASM_EMIT("xor %%edx, %%edx")
__ASM_EMIT("bsr %%eax, %%eax")
__ASM_EMIT("cmovz %%edx, %%eax")
__ASM_EMIT("4:")
: [v] "+A" (v)
:
: "cc"
);
return int(v);
}
inline int __lsp_forced_inline int_log2(int64_t v)
{
ARCH_X86_ASM (
__ASM_EMIT("test %%edx, %%edx")
__ASM_EMIT("jz 2f")
__ASM_EMIT("mov %%edx, %%eax")
__ASM_EMIT("xor %%edx, %%edx")
__ASM_EMIT("bsr %%eax, %%eax")
__ASM_EMIT("cmovz %%edx, %%eax")
__ASM_EMIT("add $32, %%eax")
__ASM_EMIT("jmp 4f")
__ASM_EMIT("2:")
__ASM_EMIT("xor %%edx, %%edx")
__ASM_EMIT("bsr %%eax, %%eax")
__ASM_EMIT("cmovz %%edx, %%eax")
__ASM_EMIT("4:")
: [v] "+A" (v)
:
: "cc"
);
return int(v);
}
#endif /* ARCH_X86_64 */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_COMMON_ARCH_X86_BITS_INT_LOG2_H_ */
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