summaryrefslogtreecommitdiff
path: root/arch/m68k/fpsp040/smovecr.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m68k/fpsp040/smovecr.S')
-rw-r--r--arch/m68k/fpsp040/smovecr.S162
1 files changed, 162 insertions, 0 deletions
diff --git a/arch/m68k/fpsp040/smovecr.S b/arch/m68k/fpsp040/smovecr.S
new file mode 100644
index 00000000000..a0127fa55e9
--- /dev/null
+++ b/arch/m68k/fpsp040/smovecr.S
@@ -0,0 +1,162 @@
+|
+| 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+| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA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