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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_ARM_ARMV7_BITS_H_
#define LSP_PLUG_IN_COMMON_ARCH_ARM_ARMV7_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
{
inline uint32_t reverse_bits(uint32_t src)
{
ARCH_ARM_ASM (
__ASM_EMIT("rbit %[src], %[src]")
: [src] "+r" (src)
: :
);
return src;
}
inline uint32_t reverse_bits(uint32_t src, size_t count)
{
ARCH_ARM_ASM (
__ASM_EMIT("rsb %[count], %[count], #32")
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], %[count]")
: [src] "+r" (src), [count] "+r" (count)
: :
);
return src;
}
inline int32_t reverse_bits(int32_t src)
{
ARCH_ARM_ASM (
__ASM_EMIT("rbit %[src], %[src]")
: [src] "+r" (src)
:
);
return src;
}
inline int32_t reverse_bits(int32_t src, size_t count)
{
ARCH_ARM_ASM (
__ASM_EMIT("rsb %[count], %[count], #32")
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], %[count]")
: [src] "+r" (src), [count] "+r" (count)
: :
);
return src;
}
inline uint16_t reverse_bits(uint16_t src)
{
ARCH_ARM_ASM (
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], #16")
: [src] "+r" (src)
: :
);
return src;
}
inline uint16_t reverse_bits(uint16_t src, size_t count)
{
ARCH_ARM_ASM (
__ASM_EMIT("rsb %[count], %[count], #32")
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], %[count]")
: [src] "+r" (src), [count] "+r" (count)
: :
);
return src;
}
inline int16_t reverse_bits(int16_t src)
{
ARCH_ARM_ASM (
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], #16")
: [src] "+r" (src)
: :
);
return src;
}
inline int16_t reverse_bits(int16_t src, size_t count)
{
ARCH_ARM_ASM (
__ASM_EMIT("rsb %[count], %[count], #32")
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], %[count]")
: [src] "+r" (src), [count] "+r" (count)
: :
);
return src;
}
inline uint8_t reverse_bits(uint8_t src)
{
ARCH_ARM_ASM (
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], #24")
: [src] "+r" (src)
: :
);
return src;
}
inline uint8_t reverse_bits(uint8_t src, size_t count)
{
ARCH_ARM_ASM (
__ASM_EMIT("rsb %[count], %[count], #32")
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], %[count]")
: [src] "+r" (src), [count] "+r" (count)
: :
);
return src;
}
inline int8_t reverse_bits(int8_t src)
{
ARCH_ARM_ASM (
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], #24")
: [src] "+r" (src)
: :
);
return src;
}
inline int8_t reverse_bits(int8_t src, size_t count)
{
ARCH_ARM_ASM (
__ASM_EMIT("rsb %[count], %[count], #32")
__ASM_EMIT("rbit %[src], %[src]")
__ASM_EMIT("lsr %[src], %[count]")
: [src] "+r" (src), [count] "+r" (count)
: :
);
return src;
}
inline uint64_t reverse_bits(uint64_t v)
{
uint32_t lo = uint32_t(v);
uint32_t hi = uint32_t(v >> 32);
ARCH_ARM_ASM
(
__ASM_EMIT("rbit %[lo], %[lo]")
__ASM_EMIT("rbit %[hi], %[hi]")
: [lo] "+r" (lo), [hi] "+r" (hi)
: :
);
return hi | (uint64_t(lo) << 32);
}
inline int64_t reverse_bits(int64_t v)
{
uint32_t lo = uint32_t(v);
uint32_t hi = uint32_t(v >> 32);
ARCH_ARM_ASM
(
__ASM_EMIT("rbit %[lo], %[lo]")
__ASM_EMIT("rbit %[hi], %[hi]")
: [lo] "+r" (lo), [hi] "+r" (hi)
: :
);
return hi | (int64_t(lo) << 32);
}
inline uint64_t reverse_bits(uint64_t v, size_t count)
{
uint32_t lo = uint32_t(v);
uint32_t hi = uint32_t(v >> 32);
uint32_t tmp;
ARCH_ARM_ASM
(
__ASM_EMIT("rsb %[count], %[count], #64")
__ASM_EMIT("rbit %[lo], %[lo]")
__ASM_EMIT("rbit %[hi], %[hi]") // [ lo, hi ]
__ASM_EMIT("cmp %[count], #32")
__ASM_EMIT("blo 2f")
__ASM_EMIT("mov %[hi], %[lo]") // [ lo, lo ]
__ASM_EMIT("sub %[count], #32")
__ASM_EMIT("eor %[lo], %[lo]") // [ 0, lo ]
__ASM_EMIT("lsr %[hi], %[count]") // [ 0, lo >> count ]
__ASM_EMIT("b 4f")
__ASM_EMIT("2:")
__ASM_EMIT("rsb %[tmp], %[count], #32") // tmp = (32 - count)
__ASM_EMIT("lsr %[hi], %[count]") // [ lo, hi >> count ]
__ASM_EMIT("lsl %[tmp], %[lo], %[tmp]") // tmp = lo << (32 - count)
__ASM_EMIT("lsr %[lo], %[count]") // lo >> (32 - count)
__ASM_EMIT("orr %[hi], %[tmp]") // [ lo >> count, (hi >> count) | (lo << (32 - count)) ]
__ASM_EMIT("4:")
: [lo] "+r" (lo), [hi] "+r" (hi), [tmp] "=&r" (tmp),
[count] "+r" (count)
: :
);
return hi | (uint64_t(lo) << 32);
}
inline int64_t reverse_bits(int64_t v, size_t count)
{
uint32_t lo = uint32_t(v);
uint32_t hi = uint32_t(v >> 32);
uint32_t tmp;
ARCH_ARM_ASM
(
__ASM_EMIT("rsb %[count], %[count], #64")
__ASM_EMIT("rbit %[lo], %[lo]")
__ASM_EMIT("rbit %[hi], %[hi]") // [ lo, hi ]
__ASM_EMIT("cmp %[count], #32")
__ASM_EMIT("blo 2f")
__ASM_EMIT("mov %[hi], %[lo]") // [ lo, lo ]
__ASM_EMIT("sub %[count], #32")
__ASM_EMIT("eor %[lo], %[lo]") // [ 0, lo ]
__ASM_EMIT("lsr %[hi], %[count]") // [ 0, lo >> count ]
__ASM_EMIT("b 4f")
__ASM_EMIT("2:")
__ASM_EMIT("rsb %[tmp], %[count], #32") // tmp = (32 - count)
__ASM_EMIT("lsr %[hi], %[count]") // [ lo, hi >> count ]
__ASM_EMIT("lsl %[tmp], %[lo], %[tmp]") // tmp = lo << (32 - count)
__ASM_EMIT("lsr %[lo], %[count]") // lo >> (32 - count)
__ASM_EMIT("orr %[hi], %[tmp]") // [ lo >> count, (hi >> count) | (lo << (32 - count)) ]
__ASM_EMIT("4:")
: [lo] "+r" (lo), [hi] "+r" (hi), [tmp] "=&r" (tmp),
[count] "+r" (count)
: :
);
return hi | (int64_t(lo) << 32);
}
}
#endif /* LSP_PLUG_IN_COMMON_ARCH_ARM_ARMV7_BITS_H_ */
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