patch-1.3.94 linux/arch/m68k/fpsp040/smovecr.S

• Lines: 163
• Date: Sat Feb 24 22:58:44 1996
• Orig file: v1.3.93/linux/arch/m68k/fpsp040/smovecr.S
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/fpsp040/smovecr.S linux/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+|	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA 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