ca2461272f
swap inline. Prune 5 or 9 instructions (depending on what you count) from the 64 bit byte swap inline.
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/* $NetBSD: byte_swap.h,v 1.3 2014/10/28 20:25:36 dennis Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RISCV_BYTE_SWAP_H_
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#define _RISCV_BYTE_SWAP_H_
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#ifdef _LOCORE
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#define BSWAP16(_src, _dst, _tmp) \
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andi _dst, _src, 0xff ;\
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slli _dst, _dst, 8 ;\
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srli _tmp, _src, 8 ;\
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and _tmp, _tmp, 0xff ;\
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ori _dst, _dst, _tmp
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#define BSWAP32(_src, _dst, _tmp) \
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li v1, 0xff00 ;\
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slli _dst, _src, 24 ;\
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srli _tmp, _src, 24 ;\
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ori _dst, _dst, _tmp ;\
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and _tmp, _src, v1 ;\
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slli _tmp, _src, 8 ;\
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ori _dst, _dst, _tmp ;\
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srli _tmp, _src, 8 ;\
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and _tmp, _tmp, v1 ;\
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ori _dst, _dst, _tmp
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#else
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#include <sys/types.h>
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__BEGIN_DECLS
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#define __BYTE_SWAP_U64_VARIABLE __byte_swap_u64_variable
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static __inline uint64_t
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__byte_swap_u64_variable(uint64_t v)
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{
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const uint64_t m1 = 0x0000ffff0000ffffull;
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const uint64_t m0 = 0x00ff00ff00ff00ffull;
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v = (v >> 32) | (v << 32);
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v = ((v >> 16) & m1) | ((v & m1) << 16);
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v = ((v >> 8) & m0) | ((v & m0) << 8);
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return v;
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}
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#define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
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static __inline uint32_t
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__byte_swap_u32_variable(uint32_t v)
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{
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const uint32_t m = 0xff00ff;
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v = (v >> 16) | (v << 16);
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v = ((v >> 8) & m) | ((v & m) << 8);
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return v;
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}
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#define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
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static __inline uint16_t
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__byte_swap_u16_variable(uint16_t v)
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{
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v &= 0xffff;
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v = (v >> 8) | (v << 8);
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return v;
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}
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__END_DECLS
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#endif /* _LOCORE */
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#endif /* _RISCV_BYTE_SWAP_H_ */
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