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xianfeng |
/*
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* fp_emu.h
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*
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* Copyright Roman Zippel, 1997. All rights reserved.
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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, and the entire permission notice in its entirety,
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* including the disclaimer of warranties.
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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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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* ALTERNATIVELY, this product may be distributed under the terms of
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* the GNU General Public License, in which case the provisions of the GPL are
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* required INSTEAD OF the above restrictions. (This clause is
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* necessary due to a potential bad interaction between the GPL and
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* the restrictions contained in a BSD-style copyright.)
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* 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
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _FP_EMU_H
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#define _FP_EMU_H
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#ifdef __ASSEMBLY__
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#include <asm/asm-offsets.h>
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#endif
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#include <asm/math-emu.h>
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#ifndef __ASSEMBLY__
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#define IS_INF(a) ((a)->exp == 0x7fff)
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#define IS_ZERO(a) ((a)->mant.m64 == 0)
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#define fp_set_sr(bit) ({ \
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FPDATA->fpsr |= 1 << (bit); \
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})
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#define fp_set_quotient(quotient) ({ \
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FPDATA->fpsr &= 0xff00ffff; \
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FPDATA->fpsr |= ((quotient) & 0xff) << 16; \
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})
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/* linkage for several useful functions */
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/* Normalize the extended struct, return 0 for a NaN */
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#define fp_normalize_ext(fpreg) ({ \
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register struct fp_ext *reg asm ("a0") = fpreg; \
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register int res asm ("d0"); \
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\
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asm volatile ("jsr fp_conv_ext2ext" \
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: "=d" (res) : "a" (reg) \
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: "a1", "d1", "d2", "memory"); \
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res; \
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})
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#define fp_copy_ext(dest, src) ({ \
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*dest = *src; \
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})
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#define fp_monadic_check(dest, src) ({ \
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fp_copy_ext(dest, src); \
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if (!fp_normalize_ext(dest)) \
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return dest; \
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})
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#define fp_dyadic_check(dest, src) ({ \
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if (!fp_normalize_ext(dest)) \
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return dest; \
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if (!fp_normalize_ext(src)) { \
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fp_copy_ext(dest, src); \
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return dest; \
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} \
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})
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extern const struct fp_ext fp_QNaN;
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extern const struct fp_ext fp_Inf;
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#define fp_set_nan(dest) ({ \
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fp_set_sr(FPSR_EXC_OPERR); \
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*dest = fp_QNaN; \
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})
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/* TODO check rounding mode? */
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#define fp_set_ovrflw(dest) ({ \
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fp_set_sr(FPSR_EXC_OVFL); \
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dest->exp = 0x7fff; \
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dest->mant.m64 = 0; \
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})
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#define fp_conv_ext2long(src) ({ \
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register struct fp_ext *__src asm ("a0") = src; \
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register int __res asm ("d0"); \
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\
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asm volatile ("jsr fp_conv_ext2long" \
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: "=d" (__res) : "a" (__src) \
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: "a1", "d1", "d2", "memory"); \
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__res; \
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})
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#define fp_conv_long2ext(dest, src) ({ \
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register struct fp_ext *__dest asm ("a0") = dest; \
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register int __src asm ("d0") = src; \
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\
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asm volatile ("jsr fp_conv_ext2long" \
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: : "d" (__src), "a" (__dest) \
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: "a1", "d1", "d2", "memory"); \
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})
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#else /* __ASSEMBLY__ */
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/*
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* set, reset or clear a bit in the fp status register
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*/
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.macro fp_set_sr bit
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bset #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
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.endm
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.macro fp_clr_sr bit
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bclr #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
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.endm
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.macro fp_tst_sr bit
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btst #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
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.endm
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#endif /* __ASSEMBLY__ */
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#endif /* _FP_EMU_H */
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