1*25c28e83SPiotr Jasiukajtis/* 2*25c28e83SPiotr Jasiukajtis * CDDL HEADER START 3*25c28e83SPiotr Jasiukajtis * 4*25c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 5*25c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 6*25c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 7*25c28e83SPiotr Jasiukajtis * 8*25c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*25c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 10*25c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions 11*25c28e83SPiotr Jasiukajtis * and limitations under the License. 12*25c28e83SPiotr Jasiukajtis * 13*25c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 14*25c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*25c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 16*25c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 17*25c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 18*25c28e83SPiotr Jasiukajtis * 19*25c28e83SPiotr Jasiukajtis * CDDL HEADER END 20*25c28e83SPiotr Jasiukajtis */ 21*25c28e83SPiotr Jasiukajtis/* 22*25c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*25c28e83SPiotr Jasiukajtis */ 24*25c28e83SPiotr Jasiukajtis/* 25*25c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26*25c28e83SPiotr Jasiukajtis * Use is subject to license terms. 27*25c28e83SPiotr Jasiukajtis */ 28*25c28e83SPiotr Jasiukajtis 29*25c28e83SPiotr Jasiukajtis .file "exp2f.s" 30*25c28e83SPiotr Jasiukajtis 31*25c28e83SPiotr Jasiukajtis#include "libm.h" 32*25c28e83SPiotr JasiukajtisLIBM_ANSI_PRAGMA_WEAK(exp2f,function) 33*25c28e83SPiotr Jasiukajtis 34*25c28e83SPiotr Jasiukajtis ENTRY(exp2f) 35*25c28e83SPiotr Jasiukajtis movl 4(%esp),%ecx / ecx <-- x 36*25c28e83SPiotr Jasiukajtis andl $0x7fffffff,%ecx / ecx <-- |x| 37*25c28e83SPiotr Jasiukajtis cmpl $0x3f800000,%ecx / Is |x| <= 1? 38*25c28e83SPiotr Jasiukajtis jbe .shortcut / If so, take a shortcut. 39*25c28e83SPiotr Jasiukajtis cmpl $0x7f800000,%ecx / |x| >= INF? 40*25c28e83SPiotr Jasiukajtis jae .not_finite / if so, x is not finite 41*25c28e83SPiotr Jasiukajtis flds 4(%esp) / push arg 42*25c28e83SPiotr Jasiukajtis fld %st(0) / duplicate stack top 43*25c28e83SPiotr Jasiukajtis frndint / [x],x 44*25c28e83SPiotr Jasiukajtis fucom / x integral? 45*25c28e83SPiotr Jasiukajtis fstsw %ax 46*25c28e83SPiotr Jasiukajtis sahf 47*25c28e83SPiotr Jasiukajtis je .x_integral / branch if x integral 48*25c28e83SPiotr Jasiukajtis fxch / x, [x] 49*25c28e83SPiotr Jasiukajtis fsub %st(1),%st / x-[x], [x] 50*25c28e83SPiotr Jasiukajtis f2xm1 / 2**(x-[x])-1, [x] 51*25c28e83SPiotr Jasiukajtis fld1 / 1,2**(x-[x])-1, [x] 52*25c28e83SPiotr Jasiukajtis faddp %st,%st(1) / 2**(x-[x]), [x] 53*25c28e83SPiotr Jasiukajtis fscale / 2**x = 2**(arg), [x] 54*25c28e83SPiotr Jasiukajtis fstp %st(1) 55*25c28e83SPiotr Jasiukajtis ret 56*25c28e83SPiotr Jasiukajtis 57*25c28e83SPiotr Jasiukajtis.x_integral: / here, x is integral 58*25c28e83SPiotr Jasiukajtis fstp %st(0) / ,x 59*25c28e83SPiotr Jasiukajtis fld1 / 1 = 2**0, x 60*25c28e83SPiotr Jasiukajtis fscale / 2**(0 + x) = 2**x, x 61*25c28e83SPiotr Jasiukajtis fstp %st(1) / 2**x 62*25c28e83SPiotr Jasiukajtis ret 63*25c28e83SPiotr Jasiukajtis 64*25c28e83SPiotr Jasiukajtis.shortcut: 65*25c28e83SPiotr Jasiukajtis / Here, |x| <= 1, 66*25c28e83SPiotr Jasiukajtis / whence x is in f2xm1's domain. 67*25c28e83SPiotr Jasiukajtis flds 4(%esp) / push x 68*25c28e83SPiotr Jasiukajtis f2xm1 / 2**x - 1 69*25c28e83SPiotr Jasiukajtis fld1 / 1,2**x - 1 70*25c28e83SPiotr Jasiukajtis faddp %st,%st(1) / 2**x 71*25c28e83SPiotr Jasiukajtis ret 72*25c28e83SPiotr Jasiukajtis 73*25c28e83SPiotr Jasiukajtis.not_finite: 74*25c28e83SPiotr Jasiukajtis ja .NaN_or_pinf / branch if x is NaN 75*25c28e83SPiotr Jasiukajtis movl 4(%esp),%eax / eax <-- x 76*25c28e83SPiotr Jasiukajtis andl $0x80000000,%eax / here, x is infinite, but +/-? 77*25c28e83SPiotr Jasiukajtis jz .NaN_or_pinf / branch if x = +INF 78*25c28e83SPiotr Jasiukajtis fldz / Here, x = -inf, so return 0 79*25c28e83SPiotr Jasiukajtis ret 80*25c28e83SPiotr Jasiukajtis 81*25c28e83SPiotr Jasiukajtis.NaN_or_pinf: 82*25c28e83SPiotr Jasiukajtis / Here, x = NaN or +inf, so load x and return immediately. 83*25c28e83SPiotr Jasiukajtis flds 4(%esp) 84*25c28e83SPiotr Jasiukajtis fwait 85*25c28e83SPiotr Jasiukajtis ret 86*25c28e83SPiotr Jasiukajtis .align 4 87*25c28e83SPiotr Jasiukajtis SET_SIZE(exp2f) 88