diff options
Diffstat (limited to 'lib/libm/arch/vax/n_cbrt.S')
| -rw-r--r-- | lib/libm/arch/vax/n_cbrt.S | 92 |
1 files changed, 0 insertions, 92 deletions
diff --git a/lib/libm/arch/vax/n_cbrt.S b/lib/libm/arch/vax/n_cbrt.S deleted file mode 100644 index 6e84d637660..00000000000 --- a/lib/libm/arch/vax/n_cbrt.S +++ /dev/null @@ -1,92 +0,0 @@ -/* $OpenBSD: n_cbrt.S,v 1.6 2013/07/15 04:03:41 espie Exp $ */ -/* $NetBSD: n_cbrt.S,v 1.1 1995/10/10 23:40:26 ragge Exp $ */ -/* - * Copyright (c) 1985, 1993 - * The 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. 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. - * - * @(#)cbrt.s 8.1 (Berkeley) 6/4/93 - */ - -#include <machine/asm.h> - -/* - * double cbrt(double arg) - * W. Kahan, 10/13/80. revised 1/13/84 for keeping sign symmetry - * error check by E LeBlanc, 8/18/82 - * Revised and tested by K.C. Ng, 5/2/85 - * Max error less than 0.667 ulps (unit in the last places) - */ -ENTRY(cbrtf, 0) - cvtfd 4(%ap),-(%sp) - calls $2,_C_LABEL(cbrt) - cvtdf %r0,%r0 - ret - -STRONG_ALIAS(cbrtl,cbrt) -ENTRY(cbrt, R2|R3|R4|R5|R6|R7) - movq 4(%ap),%r0 # r0 = argument x - bicw3 $0x807f,%r0,%r2 # biased exponent of x - jeql return # cbrt(0)=0 cbrt(res)=res. operand - bicw3 $0x7fff,%r0,%ap # ap has sign(x) - xorw2 %ap,%r0 # r0 is abs(x) - movl %r0,%r2 # r2 has abs(x) - rotl $16,%r2,%r2 # r2 = |x| with bits unscrambled - divl2 $3,%r2 # rough cbrt with bias/3 - addl2 B,%r2 # restore bias, diminish fraction - rotl $16,%r2,%r2 # r2=|q|=|cbrt| to 5 bits - mulf3 %r2,%r2,%r3 # r3 =qq - divf2 %r0,%r3 # r3 = qq/x - mulf2 %r2,%r3 - addf2 C,%r3 # r3 = s = C + qqq/x - divf3 %r3,D,%r4 # r4 = D/s - addf2 E,%r4 - addf2 %r4,%r3 # r3 = s + E + D/s - divf3 %r3,F,%r3 # r3 = F / (s + E + D/s) - addf2 G,%r3 # r3 = G + F / (s + E + D/s) - mulf2 %r3,%r2 # r2 = qr3 = new q to 23 bits - clrl %r3 # r2:r3 = q as double float - muld3 %r2,%r2,%r4 # r4:r5 = qq exactly - divd2 %r4,%r0 # r0:r1 = x/(q*q) rounded - subd3 %r2,%r0,%r6 # r6:r7 = x/(q*q) - q exactly - movq %r2,%r4 # r4:r5 = q - addw2 $0x80,%r4 # r4:r5 = 2 * q - addd2 %r0,%r4 # r4:r5 = 2*q + x/(q*q) - divd2 %r4,%r6 # r6:r7 = (x/(q*q)-q)/(2*q+x/(q*q)) - muld2 %r2,%r6 # r6:r7 = q*(x/(q*q)-q)/(2*q+x/(q*q)) - addd3 %r6,%r2,%r0 # r0:r1 = q + r6:r7 - bisw2 %ap,%r0 # restore the sign bit -return: - ret # error less than 0.667 ulps - -.data - .align 2 -B : .long 721142941 # (86-0.03306235651)*(2^23) -C : .float 0f0.5428571429 # 19/35 -D : .float 0f-0.7053061224 # -864/1225 -E : .float 0f1.414285714 # 99/70 -F : .float 0f1.607142857 # 45/28 -G : .float 0f0.3571428571 # 5/14 |