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1993-09-23
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# Copyright (c) 1985 Regents of the University of California.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed by the University of
# California, Berkeley and its contributors.
# 4. Neither the name of the University nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# @(#)argred.s 5.4 (Berkeley) 10/9/90
#
.data
.align 2
_sccsid:
.asciz "@(#)argred.s 1.1 (Berkeley) 8/21/85; 5.4 (ucb.elefunt) 10/9/90"
# libm$argred implements Bob Corbett's argument reduction and
# libm$sincos implements Peter Tang's double precision sin/cos.
#
# Note: The two entry points libm$argred and libm$sincos are meant
# to be used only by _sin, _cos and _tan.
#
# method: true range reduction to [-pi/4,pi/4], P. Tang & B. Corbett
# S. McDonald, April 4, 1985
#
.globl libm$argred
.globl libm$sincos
.text
.align 1
libm$argred:
#
# Compare the argument with the largest possible that can
# be reduced by table lookup. r3 := |x| will be used in table_lookup .
#
movd r0,r3
bgeq abs1
mnegd r3,r3
abs1:
cmpd r3,$0d+4.55530934770520019583e+01
blss small_arg
jsb trigred
rsb
small_arg:
jsb table_lookup
rsb
#
# At this point,
# r0 contains the quadrant number, 0, 1, 2, or 3;
# r2/r1 contains the reduced argument as a D-format number;
# r3 contains a F-format extension to the reduced argument;
# r4 contains a 0 or 1 corresponding to a sin or cos entry.
#
libm$sincos:
#
# Compensate for a cosine entry by adding one to the quadrant number.
#
addl2 r4,r0
#
# Polyd clobbers r5-r0 ; save X in r7/r6 .
# This can be avoided by rewriting trigred .
#
movd r1,r6
#
# Likewise, save alpha in r8 .
# This can be avoided by rewriting trigred .
#
movf r3,r8
#
# Odd or even quadrant? cosine if odd, sine otherwise.
# Save floor(quadrant/2) in r9 ; it determines the final sign.
#
rotl $-1,r0,r9
blss cosine
sine:
muld2 r1,r1 # Xsq = X * X
cmpw $0x2480,r1 # [zl] Xsq > 2^-56?
blss 1f # [zl] yes, go ahead and do polyd
clrq r1 # [zl] work around 11/780 FPA polyd bug
1:
polyd r1,$7,sin_coef # Q = P(Xsq) , of deg 7
mulf3 $0f3.0,r8,r4 # beta = 3 * alpha
mulf2 r0,r4 # beta = Q * beta
addf2 r8,r4 # beta = alpha + beta
muld2 r6,r0 # S(X) = X * Q
# cvtfd r4,r4 ... r5 = 0 after a polyd.
addd2 r4,r0 # S(X) = beta + S(X)
addd2 r6,r0 # S(X) = X + S(X)
brb done
cosine:
muld2 r6,r6 # Xsq = X * X
beql zero_arg
mulf2 r1,r8 # beta = X * alpha
polyd r6,$7,cos_coef # Q = P'(Xsq) , of deg 7
subd3 r0,r8,r0 # beta = beta - Q
subw2 $0x80,r6 # Xsq = Xsq / 2
addd2 r0,r6 # Xsq = Xsq + beta
zero_arg:
subd3 r6,$0d1.0,r0 # C(X) = 1 - Xsq
done:
blbc r9,even
mnegd r0,r0
even:
rsb
.data
.align 2
sin_coef:
.double 0d-7.53080332264191085773e-13 # s7 = 2^-29 -1.a7f2504ffc49f8..
.double 0d+1.60573519267703489121e-10 # s6 = 2^-21 1.611adaede473c8..
.double 0d-2.50520965150706067211e-08 # s5 = 2^-1a -1.ae644921ed8382..
.double 0d+2.75573191800593885716e-06 # s4 = 2^-13 1.71de3a4b884278..
.double 0d-1.98412698411850507950e-04 # s3 = 2^-0d -1.a01a01a0125e7d..
.double 0d+8.33333333333325688985e-03 # s2 = 2^-07 1.11111111110e50
.double 0d-1.66666666666666664354e-01 # s1 = 2^-03 -1.55555555555554
.double 0d+0.00000000000000000000e+00 # s0 = 0
cos_coef:
.double 0d-1.13006966202629430300e-11 # s7 = 2^-25 -1.8D9BA04D1374BE..
.double 0d+2.08746646574796004700e-09 # s6 = 2^-1D 1.1EE632650350BA..
.double 0d-2.75573073031284417300e-07 # s5 = 2^-16 -1.27E4F31411719E..
.double 0d+2.48015872682668025200e-05 # s4 = 2^-10 1.A01A0196B902E8..
.double 0d-1.38888888888464709200e-03 # s3 = 2^-0A -1.6C16C16C11FACE..
.double 0d+4.16666666666664761400e-02 # s2 = 2^-05 1.5555555555539E
.double 0d+0.00000000000000000000e+00 # s1 = 0
.double 0d+0.00000000000000000000e+00 # s0 = 0
#
# Multiples of pi/2 expressed as the sum of three doubles,
#
# trailing: n * pi/2 , n = 0, 1, 2, ..., 29
# trailing[n] ,
#
# middle: n * pi/2 , n = 0, 1, 2, ..., 29
# middle[n] ,
#
# leading: n * pi/2 , n = 0, 1, 2, ..., 29
# leading[n] ,
#
# where
# leading[n] := (n * pi/2) rounded,
# middle[n] := (n * pi/2 - leading[n]) rounded,
# trailing[n] := (( n * pi/2 - leading[n]) - middle[n]) rounded .
trailing:
.double 0d+0.00000000000000000000e+00 # 0 * pi/2 trailing
.double 0d+4.33590506506189049611e-35 # 1 * pi/2 trailing
.double 0d+8.67181013012378099223e-35 # 2 * pi/2 trailing
.double 0d+1.30077151951856714215e-34 # 3 * pi/2 trailing
.double 0d+1.73436202602475619845e-34 # 4 * pi/2 trailing
.double 0d-1.68390735624352669192e-34 # 5 * pi/2 trailing
.double 0d+2.60154303903713428430e-34 # 6 * pi/2 trailing
.double 0d-8.16726343231148352150e-35 # 7 * pi/2 trailing
.double 0d+3.46872405204951239689e-34 # 8 * pi/2 trailing
.double 0d+3.90231455855570147991e-34 # 9 * pi/2 trailing
.double 0d-3.36781471248705338384e-34 # 10 * pi/2 trailing
.double 0d-1.06379439835298071785e-33 # 11 * pi/2 trailing
.double 0d+5.20308607807426856861e-34 # 12 * pi/2 trailing
.double 0d+5.63667658458045770509e-34 # 13 * pi/2 trailing
.double 0d-1.63345268646229670430e-34 # 14 * pi/2 trailing
.double 0d-1.19986217995610764801e-34 # 15 * pi/2 trailing
.double 0d+6.93744810409902479378e-34 # 16 * pi/2 trailing
.double 0d-8.03640094449267300110e-34 # 17 * pi/2 trailing
.double 0d+7.80462911711140295982e-34 # 18 * pi/2 trailing
.double 0d-7.16921993148029483506e-34 # 19 * pi/2 trailing
.double 0d-6.73562942497410676769e-34 # 20 * pi/2 trailing
.double 0d-6.30203891846791677593e-34 # 21 * pi/2 trailing
.double 0d-2.12758879670596143570e-33 # 22 * pi/2 trailing
.double 0d+2.53800212047402350390e-33 # 23 * pi/2 trailing
.double 0d+1.04061721561485371372e-33 # 24 * pi/2 trailing
.double 0d+6.11729905311472319056e-32 # 25 * pi/2 trailing
.double 0d+1.12733531691609154102e-33 # 26 * pi/2 trailing
.double 0d-3.70049587943078297272e-34 # 27 * pi/2 trailing
.double 0d-3.26690537292459340860e-34 # 28 * pi/2 trailing
.double 0d-1.14812616507957271361e-34 # 29 * pi/2 trailing
middle:
.double 0d+0.00000000000000000000e+00 # 0 * pi/2 middle
.double 0d+5.72118872610983179676e-18 # 1 * pi/2 middle
.double 0d+1.14423774522196635935e-17 # 2 * pi/2 middle
.double 0d-3.83475850529283316309e-17 # 3 * pi/2 middle
.double 0d+2.28847549044393271871e-17 # 4 * pi/2 middle
.double 0d-2.69052076007086676522e-17 # 5 * pi/2 middle
.double 0d-7.66951701058566632618e-17 # 6 * pi/2 middle
.double 0d-1.54628301484890040587e-17 # 7 * pi/2 middle
.double 0d+4.57695098088786543741e-17 # 8 * pi/2 middle
.double 0d+1.07001849766246313192e-16 # 9 * pi/2 middle
.double 0d-5.38104152014173353044e-1