1*5b2ba9d3SPiotr Jasiukajtis/* 2*5b2ba9d3SPiotr Jasiukajtis * CDDL HEADER START 3*5b2ba9d3SPiotr Jasiukajtis * 4*5b2ba9d3SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 5*5b2ba9d3SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 6*5b2ba9d3SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 7*5b2ba9d3SPiotr Jasiukajtis * 8*5b2ba9d3SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5b2ba9d3SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 10*5b2ba9d3SPiotr Jasiukajtis * See the License for the specific language governing permissions 11*5b2ba9d3SPiotr Jasiukajtis * and limitations under the License. 12*5b2ba9d3SPiotr Jasiukajtis * 13*5b2ba9d3SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 14*5b2ba9d3SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5b2ba9d3SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 16*5b2ba9d3SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 17*5b2ba9d3SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 18*5b2ba9d3SPiotr Jasiukajtis * 19*5b2ba9d3SPiotr Jasiukajtis * CDDL HEADER END 20*5b2ba9d3SPiotr Jasiukajtis */ 21*5b2ba9d3SPiotr Jasiukajtis/* 22*5b2ba9d3SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*5b2ba9d3SPiotr Jasiukajtis */ 24*5b2ba9d3SPiotr Jasiukajtis/* 25*5b2ba9d3SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26*5b2ba9d3SPiotr Jasiukajtis * Use is subject to license terms. 27*5b2ba9d3SPiotr Jasiukajtis */ 28*5b2ba9d3SPiotr Jasiukajtis 29*5b2ba9d3SPiotr Jasiukajtis .file "log.s" 30*5b2ba9d3SPiotr Jasiukajtis 31*5b2ba9d3SPiotr Jasiukajtis#include "libm.h" 32*5b2ba9d3SPiotr JasiukajtisLIBM_ANSI_PRAGMA_WEAK(log,function) 33*5b2ba9d3SPiotr Jasiukajtis#include "libm_protos.h" 34*5b2ba9d3SPiotr Jasiukajtis 35*5b2ba9d3SPiotr Jasiukajtis ENTRY(log) 36*5b2ba9d3SPiotr Jasiukajtis fldln2 / loge(2) 37*5b2ba9d3SPiotr Jasiukajtis movl 8(%esp),%eax / eax <-- hi_32(x) 38*5b2ba9d3SPiotr Jasiukajtis testl $0x80000000,%eax 39*5b2ba9d3SPiotr Jasiukajtis jnz .maybe_0_or_less 40*5b2ba9d3SPiotr Jasiukajtis testl $0x7fffffff,%eax 41*5b2ba9d3SPiotr Jasiukajtis jz .maybe_0 42*5b2ba9d3SPiotr Jasiukajtis fldl 4(%esp) / arg, loge(2) 43*5b2ba9d3SPiotr Jasiukajtis fyl2x / loge(2)*log2(arg); ln(arg) 44*5b2ba9d3SPiotr Jasiukajtis ret 45*5b2ba9d3SPiotr Jasiukajtis 46*5b2ba9d3SPiotr Jasiukajtis.maybe_0: 47*5b2ba9d3SPiotr Jasiukajtis movl 4(%esp),%ecx / ecx <-- lo_32(x) 48*5b2ba9d3SPiotr Jasiukajtis cmpl $0,%ecx 49*5b2ba9d3SPiotr Jasiukajtis je .zero / no branch if x is +denormal 50*5b2ba9d3SPiotr Jasiukajtis.neg_nan_reentry: 51*5b2ba9d3SPiotr Jasiukajtis fldl 4(%esp) / arg, loge(2) 52*5b2ba9d3SPiotr Jasiukajtis fyl2x / loge(2)*log2(arg); ln(arg) 53*5b2ba9d3SPiotr Jasiukajtis ret 54*5b2ba9d3SPiotr Jasiukajtis 55*5b2ba9d3SPiotr Jasiukajtis.zero_or_less: 56*5b2ba9d3SPiotr Jasiukajtis / x =< 0 57*5b2ba9d3SPiotr Jasiukajtis testl $0x7fffffff,%eax 58*5b2ba9d3SPiotr Jasiukajtis jnz .less_than_0 59*5b2ba9d3SPiotr Jasiukajtis movl 4(%esp),%ecx / ecx <-- lo_32(x) 60*5b2ba9d3SPiotr Jasiukajtis cmpl $0,%ecx 61*5b2ba9d3SPiotr Jasiukajtis jne .less_than_0 / branch if x is -denormal 62*5b2ba9d3SPiotr Jasiukajtis.zero: 63*5b2ba9d3SPiotr Jasiukajtis / x = +/-0 64*5b2ba9d3SPiotr Jasiukajtis pushl %ebp 65*5b2ba9d3SPiotr Jasiukajtis movl %esp,%ebp 66*5b2ba9d3SPiotr Jasiukajtis PIC_SETUP(1) 67*5b2ba9d3SPiotr Jasiukajtis pushl $16 68*5b2ba9d3SPiotr Jasiukajtis jmp .merge 69*5b2ba9d3SPiotr Jasiukajtis 70*5b2ba9d3SPiotr Jasiukajtis.maybe_0_or_less: 71*5b2ba9d3SPiotr Jasiukajtis cmpl $0xfff00000,%eax / -INF below hi_32(x)? 72*5b2ba9d3SPiotr Jasiukajtis ja .neg_nan_reentry 73*5b2ba9d3SPiotr Jasiukajtis jb .zero_or_less 74*5b2ba9d3SPiotr Jasiukajtis movl 4(%esp),%ecx / ecx <-- lo_32(x) 75*5b2ba9d3SPiotr Jasiukajtis cmpl $0,%ecx / is x NaN or -INF? 76*5b2ba9d3SPiotr Jasiukajtis jne .neg_nan_reentry / branch if x is NaN with signbit = 1 77*5b2ba9d3SPiotr Jasiukajtis / x = -INF 78*5b2ba9d3SPiotr Jasiukajtis.less_than_0: 79*5b2ba9d3SPiotr Jasiukajtis pushl %ebp 80*5b2ba9d3SPiotr Jasiukajtis movl %esp,%ebp 81*5b2ba9d3SPiotr Jasiukajtis PIC_SETUP(2) 82*5b2ba9d3SPiotr Jasiukajtis pushl $17 83*5b2ba9d3SPiotr Jasiukajtis.merge: 84*5b2ba9d3SPiotr Jasiukajtis fstp %st(0) / stack empty 85*5b2ba9d3SPiotr Jasiukajtis pushl 12(%ebp) 86*5b2ba9d3SPiotr Jasiukajtis pushl 8(%ebp) 87*5b2ba9d3SPiotr Jasiukajtis pushl 12(%ebp) 88*5b2ba9d3SPiotr Jasiukajtis pushl 8(%ebp) 89*5b2ba9d3SPiotr Jasiukajtis call PIC_F(_SVID_libm_err) 90*5b2ba9d3SPiotr Jasiukajtis addl $20,%esp 91*5b2ba9d3SPiotr Jasiukajtis PIC_WRAPUP 92*5b2ba9d3SPiotr Jasiukajtis leave 93*5b2ba9d3SPiotr Jasiukajtis ret 94*5b2ba9d3SPiotr Jasiukajtis .align 4 95*5b2ba9d3SPiotr Jasiukajtis SET_SIZE(log) 96