1 * $NetBSD: smovecr.sa,v 1.2 1994/10/26 07:49:57 cgd Exp $ 2 3 * MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP 4 * M68000 Hi-Performance Microprocessor Division 5 * M68040 Software Package 6 * 7 * M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc. 8 * All rights reserved. 9 * 10 * THE SOFTWARE is provided on an "AS IS" basis and without warranty. 11 * To the maximum extent permitted by applicable law, 12 * MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, 13 * INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A 14 * PARTICULAR PURPOSE and any warranty against infringement with 15 * regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF) 16 * and any accompanying written materials. 17 * 18 * To the maximum extent permitted by applicable law, 19 * IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER 20 * (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS 21 * PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR 22 * OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE 23 * SOFTWARE. Motorola assumes no responsibility for the maintenance 24 * and support of the SOFTWARE. 25 * 26 * You are hereby granted a copyright license to use, modify, and 27 * distribute the SOFTWARE so long as this entire notice is retained 28 * without alteration in any modified and/or redistributed versions, 29 * and that such modified versions are clearly identified as such. 30 * No licenses are granted by implication, estoppel or otherwise 31 * under any patents or trademarks of Motorola, Inc. 32 33 * 34 * smovecr.sa 3.1 12/10/90 35 * 36 * The entry point sMOVECR returns the constant at the 37 * offset given in the instruction field. 38 * 39 * Input: An offset in the instruction word. 40 * 41 * Output: The constant rounded to the user's rounding 42 * mode unchecked for overflow. 43 * 44 * Modified: fp0. 45 * 46 47 SMOVECR IDNT 2,1 Motorola 040 Floating Point Software Package 48 49 section 8 50 51 include fpsp.h 52 53 xref nrm_set 54 xref round 55 xref PIRN 56 xref PIRZRM 57 xref PIRP 58 xref SMALRN 59 xref SMALRZRM 60 xref SMALRP 61 xref BIGRN 62 xref BIGRZRM 63 xref BIGRP 64 65 FZERO dc.l 00000000 66 * 67 * FMOVECR 68 * 69 xdef smovcr 70 smovcr: 71 bfextu CMDREG1B(a6){9:7},d0 ;get offset 72 bfextu USER_FPCR(a6){26:2},d1 ;get rmode 73 * 74 * check range of offset 75 * 76 tst.b d0 ;if zero, offset is to pi 77 beq.b PI_TBL ;it is pi 78 cmpi.b #$0a,d0 ;check range $01 - $0a 79 ble.b Z_VAL ;if in this range, return zero 80 cmpi.b #$0e,d0 ;check range $0b - $0e 81 ble.b SM_TBL ;valid constants in this range 82 cmpi.b #$2f,d0 ;check range $10 - $2f 83 ble.b Z_VAL ;if in this range, return zero 84 cmpi.b #$3f,d0 ;check range $30 - $3f 85 ble BG_TBL ;valid constants in this range 86 Z_VAL: 87 fmove.s FZERO,fp0 88 rts 89 PI_TBL: 90 tst.b d1 ;offset is zero, check for rmode 91 beq.b PI_RN ;if zero, rn mode 92 cmpi.b #$3,d1 ;check for rp 93 beq.b PI_RP ;if 3, rp mode 94 PI_RZRM: 95 lea.l PIRZRM,a0 ;rmode is rz or rm, load PIRZRM in a0 96 bra set_finx 97 PI_RN: 98 lea.l PIRN,a0 ;rmode is rn, load PIRN in a0 99 bra set_finx 100 PI_RP: 101 lea.l PIRP,a0 ;rmode is rp, load PIRP in a0 102 bra set_finx 103 SM_TBL: 104 subi.l #$b,d0 ;make offset in 0 - 4 range 105 tst.b d1 ;check for rmode 106 beq.b SM_RN ;if zero, rn mode 107 cmpi.b #$3,d1 ;check for rp 108 beq.b SM_RP ;if 3, rp mode 109 SM_RZRM: 110 lea.l SMALRZRM,a0 ;rmode is rz or rm, load SMRZRM in a0 111 cmpi.b #$2,d0 ;check if result is inex 112 ble set_finx ;if 0 - 2, it is inexact 113 bra no_finx ;if 3, it is exact 114 SM_RN: 115 lea.l SMALRN,a0 ;rmode is rn, load SMRN in a0 116 cmpi.b #$2,d0 ;check if result is inex 117 ble set_finx ;if 0 - 2, it is inexact 118 bra no_finx ;if 3, it is exact 119 SM_RP: 120 lea.l SMALRP,a0 ;rmode is rp, load SMRP in a0 121 cmpi.b #$2,d0 ;check if result is inex 122 ble set_finx ;if 0 - 2, it is inexact 123 bra no_finx ;if 3, it is exact 124 BG_TBL: 125 subi.l #$30,d0 ;make offset in 0 - f range 126 tst.b d1 ;check for rmode 127 beq.b BG_RN ;if zero, rn mode 128 cmpi.b #$3,d1 ;check for rp 129 beq.b BG_RP ;if 3, rp mode 130 BG_RZRM: 131 lea.l BIGRZRM,a0 ;rmode is rz or rm, load BGRZRM in a0 132 cmpi.b #$1,d0 ;check if result is inex 133 ble set_finx ;if 0 - 1, it is inexact 134 cmpi.b #$7,d0 ;second check 135 ble no_finx ;if 0 - 7, it is exact 136 bra set_finx ;if 8 - f, it is inexact 137 BG_RN: 138 lea.l BIGRN,a0 ;rmode is rn, load BGRN in a0 139 cmpi.b #$1,d0 ;check if result is inex 140 ble set_finx ;if 0 - 1, it is inexact 141 cmpi.b #$7,d0 ;second check 142 ble no_finx ;if 0 - 7, it is exact 143 bra set_finx ;if 8 - f, it is inexact 144 BG_RP: 145 lea.l BIGRP,a0 ;rmode is rp, load SMRP in a0 146 cmpi.b #$1,d0 ;check if result is inex 147 ble set_finx ;if 0 - 1, it is inexact 148 cmpi.b #$7,d0 ;second check 149 ble no_finx ;if 0 - 7, it is exact 150 * bra set_finx ;if 8 - f, it is inexact 151 set_finx: 152 or.l #inx2a_mask,USER_FPSR(a6) ;set inex2/ainex 153 no_finx: 154 mulu.l #12,d0 ;use offset to point into tables 155 move.l d1,L_SCR1(a6) ;load mode for round call 156 bfextu USER_FPCR(a6){24:2},d1 ;get precision 157 tst.l d1 ;check if extended precision 158 * 159 * Precision is extended 160 * 161 bne.b not_ext ;if extended, do not call round 162 fmovem.x (a0,d0),fp0 ;return result in fp0 163 rts 164 * 165 * Precision is single or double 166 * 167 not_ext: 168 swap d1 ;rnd prec in upper word of d1 169 add.l L_SCR1(a6),d1 ;merge rmode in low word of d1 170 move.l (a0,d0),FP_SCR1(a6) ;load first word to temp storage 171 move.l 4(a0,d0),FP_SCR1+4(a6) ;load second word 172 move.l 8(a0,d0),FP_SCR1+8(a6) ;load third word 173 clr.l d0 ;clear g,r,s 174 lea FP_SCR1(a6),a0 175 btst.b #sign_bit,LOCAL_EX(a0) 176 sne LOCAL_SGN(a0) ;convert to internal ext. format 177 178 bsr round ;go round the mantissa 179 180 bfclr LOCAL_SGN(a0){0:8} ;convert back to IEEE ext format 181 beq.b fin_fcr 182 bset.b #sign_bit,LOCAL_EX(a0) 183 fin_fcr: 184 fmovem.x (a0),fp0 185 rts 186 187 end 188
Indexes created Mon Oct 20 05:10:11 GMT 2025