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