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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [m68k/] [math-emu/] [fp_emu.h] - Rev 3
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/* * 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 __ASSEMBLY__ #include <asm/asm-offsets.h> #endif #include <asm/math-emu.h> #ifndef __ASSEMBLY__ #define IS_INF(a) ((a)->exp == 0x7fff) #define IS_ZERO(a) ((a)->mant.m64 == 0) #define fp_set_sr(bit) ({ \ FPDATA->fpsr |= 1 << (bit); \ }) #define fp_set_quotient(quotient) ({ \ FPDATA->fpsr &= 0xff00ffff; \ FPDATA->fpsr |= ((quotient) & 0xff) << 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 = 0x7fff; \ 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 /* __ASSEMBLY__ */ /* * 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 /* __ASSEMBLY__ */ #endif /* _FP_EMU_H */