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146 lines
4.2 KiB
146 lines
4.2 KiB
/* |
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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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