| | |
| | smovecr.sa 3.1 12/10/90 |
| | |
| | The entry point sMOVECR returns the constant at the |
| | offset given in the instruction field. |
| | |
| | Input: An offset in the instruction word. |
| | |
| | Output: The constant rounded to the user's rounding |
| | mode unchecked for overflow. |
| | |
| | Modified: fp0. |
| | |
| | |
| | Copyright (C) Motorola, Inc. 1990 |
| | All Rights Reserved |
| | |
| | THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA |
| | The copyright notice above does not evidence any |
| | actual or intended publication of such source code. |
| |
| |SMOVECR idnt 2,1 | Motorola 040 Floating Point Software Package |
| |
| |section 8 |
| |
| #include "fpsp.h" |
| |
| |xref nrm_set |
| |xref round |
| |xref PIRN |
| |xref PIRZRM |
| |xref PIRP |
| |xref SMALRN |
| |xref SMALRZRM |
| |xref SMALRP |
| |xref BIGRN |
| |xref BIGRZRM |
| |xref BIGRP |
| |
| FZERO: .long 00000000 |
| | |
| | FMOVECR |
| | |
| .global smovcr |
| smovcr: |
| bfextu CMDREG1B(%a6){#9:#7},%d0 |get offset |
| bfextu USER_FPCR(%a6){#26:#2},%d1 |get rmode |
| | |
| | check range of offset |
| | |
| tstb %d0 |if zero, offset is to pi |
| beqs PI_TBL |it is pi |
| cmpib #0x0a,%d0 |check range $01 - $0a |
| bles Z_VAL |if in this range, return zero |
| cmpib #0x0e,%d0 |check range $0b - $0e |
| bles SM_TBL |valid constants in this range |
| cmpib #0x2f,%d0 |check range $10 - $2f |
| bles Z_VAL |if in this range, return zero |
| cmpib #0x3f,%d0 |check range $30 - $3f |
| ble BG_TBL |valid constants in this range |
| Z_VAL: |
| fmoves FZERO,%fp0 |
| rts |
| PI_TBL: |
| tstb %d1 |offset is zero, check for rmode |
| beqs PI_RN |if zero, rn mode |
| cmpib #0x3,%d1 |check for rp |
| beqs PI_RP |if 3, rp mode |
| PI_RZRM: |
| leal PIRZRM,%a0 |rmode is rz or rm, load PIRZRM in a0 |
| bra set_finx |
| PI_RN: |
| leal PIRN,%a0 |rmode is rn, load PIRN in a0 |
| bra set_finx |
| PI_RP: |
| leal PIRP,%a0 |rmode is rp, load PIRP in a0 |
| bra set_finx |
| SM_TBL: |
| subil #0xb,%d0 |make offset in 0 - 4 range |
| tstb %d1 |check for rmode |
| beqs SM_RN |if zero, rn mode |
| cmpib #0x3,%d1 |check for rp |
| beqs SM_RP |if 3, rp mode |
| SM_RZRM: |
| leal SMALRZRM,%a0 |rmode is rz or rm, load SMRZRM in a0 |
| cmpib #0x2,%d0 |check if result is inex |
| ble set_finx |if 0 - 2, it is inexact |
| bra no_finx |if 3, it is exact |
| SM_RN: |
| leal SMALRN,%a0 |rmode is rn, load SMRN in a0 |
| cmpib #0x2,%d0 |check if result is inex |
| ble set_finx |if 0 - 2, it is inexact |
| bra no_finx |if 3, it is exact |
| SM_RP: |
| leal SMALRP,%a0 |rmode is rp, load SMRP in a0 |
| cmpib #0x2,%d0 |check if result is inex |
| ble set_finx |if 0 - 2, it is inexact |
| bra no_finx |if 3, it is exact |
| BG_TBL: |
| subil #0x30,%d0 |make offset in 0 - f range |
| tstb %d1 |check for rmode |
| beqs BG_RN |if zero, rn mode |
| cmpib #0x3,%d1 |check for rp |
| beqs BG_RP |if 3, rp mode |
| BG_RZRM: |
| leal BIGRZRM,%a0 |rmode is rz or rm, load BGRZRM in a0 |
| cmpib #0x1,%d0 |check if result is inex |
| ble set_finx |if 0 - 1, it is inexact |
| cmpib #0x7,%d0 |second check |
| ble no_finx |if 0 - 7, it is exact |
| bra set_finx |if 8 - f, it is inexact |
| BG_RN: |
| leal BIGRN,%a0 |rmode is rn, load BGRN in a0 |
| cmpib #0x1,%d0 |check if result is inex |
| ble set_finx |if 0 - 1, it is inexact |
| cmpib #0x7,%d0 |second check |
| ble no_finx |if 0 - 7, it is exact |
| bra set_finx |if 8 - f, it is inexact |
| BG_RP: |
| leal BIGRP,%a0 |rmode is rp, load SMRP in a0 |
| cmpib #0x1,%d0 |check if result is inex |
| ble set_finx |if 0 - 1, it is inexact |
| cmpib #0x7,%d0 |second check |
| ble no_finx |if 0 - 7, it is exact |
| | bra set_finx ;if 8 - f, it is inexact |
| set_finx: |
| orl #inx2a_mask,USER_FPSR(%a6) |set inex2/ainex |
| no_finx: |
| mulul #12,%d0 |use offset to point into tables |
| movel %d1,L_SCR1(%a6) |load mode for round call |
| bfextu USER_FPCR(%a6){#24:#2},%d1 |get precision |
| tstl %d1 |check if extended precision |
| | |
| | Precision is extended |
| | |
| bnes not_ext |if extended, do not call round |
| fmovemx (%a0,%d0),%fp0-%fp0 |return result in fp0 |
| rts |
| | |
| | Precision is single or double |
| | |
| not_ext: |
| swap %d1 |rnd prec in upper word of d1 |
| addl L_SCR1(%a6),%d1 |merge rmode in low word of d1 |
| movel (%a0,%d0),FP_SCR1(%a6) |load first word to temp storage |
| movel 4(%a0,%d0),FP_SCR1+4(%a6) |load second word |
| movel 8(%a0,%d0),FP_SCR1+8(%a6) |load third word |
| clrl %d0 |clear g,r,s |
| lea FP_SCR1(%a6),%a0 |
| btstb #sign_bit,LOCAL_EX(%a0) |
| sne LOCAL_SGN(%a0) |convert to internal ext. format |
| |
| bsr round |go round the mantissa |
| |
| bfclr LOCAL_SGN(%a0){#0:#8} |convert back to IEEE ext format |
| beqs fin_fcr |
| bsetb #sign_bit,LOCAL_EX(%a0) |
| fin_fcr: |
| fmovemx (%a0),%fp0-%fp0 |
| rts |
| |
| |end |
