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Annotation of nono/fpe/fpu_fmovecr.c, revision 1.1

1.1     ! root        1: /*     $NetBSD: fpu_fmovecr.c,v 1.16 2013/03/26 11:30:20 isaki Exp $   */
        !             2: 
        !             3: /*
        !             4:  * Copyright (c) 1995  Ken Nakata
        !             5:  *     All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  * 3. Neither the name of the author nor the names of its contributors
        !            16:  *    may be used to endorse or promote products derived from this software
        !            17:  *    without specific prior written permission.
        !            18:  *
        !            19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            29:  * SUCH DAMAGE.
        !            30:  *
        !            31:  *     @(#)fpu_fmovecr.c       10/8/95
        !            32:  */
        !            33: 
        !            34: #include "fpu_emulate.h"
        !            35: 
        !            36: /* XXX: quick consistency check */
        !            37: #if (FP_1 != 0x40000)
        !            38: #error you have to change this table when changing the mantissa size
        !            39: #endif
        !            40: 
        !            41: static struct fpn constrom[] = {
        !            42:        /* fp_class, fp_sign, fp_exp, fp_sticky, fp_mant[0] ... [2] */
        !            43:        { FPC_NUM, 0, 1, 0, { 0x6487e, 0xd5110b46, 0x11a60000 } },
        !            44:        { FPC_NUM, 0, -2, 0, { 0x4d104, 0xd427de7f, 0xbcc40000 } },
        !            45:        { FPC_NUM, 0, 1, 0, { 0x56fc2, 0xa2c515da, 0x54d40000 } },
        !            46:        { FPC_NUM, 0, 0, 0, { 0x5c551, 0xd94ae0bf, 0x85de0000 } },
        !            47:        { FPC_NUM, 0, -2, 0, { 0x6f2de, 0xc549b943, 0x8ca80000 } },
        !            48:        { FPC_ZERO, 0, 0, 0, { 0x0, 0x0, 0x0 } },
        !            49:        { FPC_NUM, 0, -1, 0, { 0x58b90, 0xbfbe8e7b, 0xcd5c0000 } },
        !            50:        { FPC_NUM, 0, 1, 0, { 0x49aec, 0x6eed5545, 0x60b60000 } },
        !            51:        { FPC_NUM, 0, 0, 0, { 0x40000, 0x0, 0x0 } },
        !            52:        { FPC_NUM, 0, 3, 0, { 0x50000, 0x0, 0x0 } },
        !            53:        { FPC_NUM, 0, 6, 0, { 0x64000, 0x0, 0x0 } },
        !            54:        { FPC_NUM, 0, 13, 0, { 0x4e200, 0x0, 0x0 } },
        !            55:        { FPC_NUM, 0, 26, 0, { 0x5f5e1, 0x0, 0x0 } },
        !            56:        { FPC_NUM, 0, 53, 0, { 0x470de, 0x4df82000, 0x0 } },
        !            57:        { FPC_NUM, 0, 106, 0, { 0x4ee2d, 0x6d415b85, 0xacec0000 } },
        !            58:        { FPC_NUM, 0, 212, 0, { 0x613c0, 0xfa4ffe7d, 0x36aa0000 } },
        !            59:        { FPC_NUM, 0, 425, 0, { 0x49dd2, 0x3e4c074c, 0x66fc0000 } },
        !            60:        { FPC_NUM, 0, 850, 0, { 0x553f7, 0x5fdcefce, 0xf46c0000 } },
        !            61:        { FPC_NUM, 0, 1700, 0, { 0x718cd, 0x5753074, 0x8e360000 } },
        !            62:        { FPC_NUM, 0, 3401, 0, { 0x64bb3, 0xac340ba8, 0x60ba0000 } },
        !            63:        { FPC_NUM, 0, 6803, 0, { 0x4f459, 0xdaee29ea, 0xef260000 } },
        !            64:        { FPC_NUM, 0, 13606, 0, { 0x62302, 0x90145104, 0xbcd60000 } },
        !            65: };
        !            66: 
        !            67: struct fpn *
        !            68: fpu_const(struct fpn *fp, uint32_t offset)
        !            69: {
        !            70:        struct fpn *r;
        !            71: 
        !            72: #ifdef DEBUG
        !            73:        if (fp == NULL) {
        !            74:                panic("fpu_const: NULL pointer passed");
        !            75:        }
        !            76: #endif
        !            77:        if (offset == 0) {
        !            78:                r = &constrom[0];
        !            79:        } else if (0xb <= offset && offset <= 0xe) {
        !            80:                r = &constrom[offset - 0xb + 1];
        !            81:        } else if (0x30 <= offset && offset <= 0x3f) {
        !            82:                r = &constrom[offset - 0x30 + 6];
        !            83:        } else {
        !            84:                /* return 0.0 for anything else (incl. valid offset 0xf) */
        !            85:                r = &constrom[5];
        !            86:        }
        !            87: 
        !            88:        CPYFPN(fp, r);
        !            89: 
        !            90:        return fp;
        !            91: }
        !            92: 
        !            93: #if !defined(XM6i_FPE)
        !            94: int
        !            95: fpu_emul_fmovecr(struct fpemu *fe, struct instruction *insn)
        !            96: {
        !            97:        int dstreg, offset;
        !            98:        uint32_t *fpreg;
        !            99: 
        !           100:        dstreg = (insn->is_word1 >> 7) & 0x7;
        !           101:        offset = insn->is_word1 & 0x7F;
        !           102:        fpreg = &(fe->fe_fpframe->fpf_regs[0]);
        !           103: 
        !           104:        (void)fpu_const(&fe->fe_f3, offset);
        !           105:        fpu_implode(fe, &fe->fe_f3, FTYPE_EXT, &fpreg[dstreg * 3]);
        !           106:        (void)fpu_upd_fpsr(fe, &fe->fe_f3);
        !           107: #if DEBUG_FPE
        !           108:        printf("  fpu_emul_fmovecr: result %08x,%08x,%08x to FP%d\n",
        !           109:            fpreg[dstreg * 3], fpreg[dstreg * 3 + 1], fpreg[dstreg * 3 + 2],
        !           110:            dstreg);
        !           111: #endif
        !           112:        return 0;
        !           113: }
        !           114: #endif /* !XM6i_FPE */

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