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 "log.s" 30*25c28e83SPiotr Jasiukajtis 31*25c28e83SPiotr Jasiukajtis#include "libm.h" 32*25c28e83SPiotr JasiukajtisLIBM_ANSI_PRAGMA_WEAK(log,function) 33*25c28e83SPiotr Jasiukajtis#include "libm_protos.h" 34*25c28e83SPiotr Jasiukajtis 35*25c28e83SPiotr Jasiukajtis ENTRY(log) 36*25c28e83SPiotr Jasiukajtis fldln2 / loge(2) 37*25c28e83SPiotr Jasiukajtis movl 8(%esp),%eax / eax <-- hi_32(x) 38*25c28e83SPiotr Jasiukajtis testl $0x80000000,%eax 39*25c28e83SPiotr Jasiukajtis jnz .maybe_0_or_less 40*25c28e83SPiotr Jasiukajtis testl $0x7fffffff,%eax 41*25c28e83SPiotr Jasiukajtis jz .maybe_0 42*25c28e83SPiotr Jasiukajtis fldl 4(%esp) / arg, loge(2) 43*25c28e83SPiotr Jasiukajtis fyl2x / loge(2)*log2(arg); ln(arg) 44*25c28e83SPiotr Jasiukajtis ret 45*25c28e83SPiotr Jasiukajtis 46*25c28e83SPiotr Jasiukajtis.maybe_0: 47*25c28e83SPiotr Jasiukajtis movl 4(%esp),%ecx / ecx <-- lo_32(x) 48*25c28e83SPiotr Jasiukajtis cmpl $0,%ecx 49*25c28e83SPiotr Jasiukajtis je .zero / no branch if x is +denormal 50*25c28e83SPiotr Jasiukajtis.neg_nan_reentry: 51*25c28e83SPiotr Jasiukajtis fldl 4(%esp) / arg, loge(2) 52*25c28e83SPiotr Jasiukajtis fyl2x / loge(2)*log2(arg); ln(arg) 53*25c28e83SPiotr Jasiukajtis ret 54*25c28e83SPiotr Jasiukajtis 55*25c28e83SPiotr Jasiukajtis.zero_or_less: 56*25c28e83SPiotr Jasiukajtis / x =< 0 57*25c28e83SPiotr Jasiukajtis testl $0x7fffffff,%eax 58*25c28e83SPiotr Jasiukajtis jnz .less_than_0 59*25c28e83SPiotr Jasiukajtis movl 4(%esp),%ecx / ecx <-- lo_32(x) 60*25c28e83SPiotr Jasiukajtis cmpl $0,%ecx 61*25c28e83SPiotr Jasiukajtis jne .less_than_0 / branch if x is -denormal 62*25c28e83SPiotr Jasiukajtis.zero: 63*25c28e83SPiotr Jasiukajtis / x = +/-0 64*25c28e83SPiotr Jasiukajtis pushl %ebp 65*25c28e83SPiotr Jasiukajtis movl %esp,%ebp 66*25c28e83SPiotr Jasiukajtis PIC_SETUP(1) 67*25c28e83SPiotr Jasiukajtis pushl $16 68*25c28e83SPiotr Jasiukajtis jmp .merge 69*25c28e83SPiotr Jasiukajtis 70*25c28e83SPiotr Jasiukajtis.maybe_0_or_less: 71*25c28e83SPiotr Jasiukajtis cmpl $0xfff00000,%eax / -INF below hi_32(x)? 72*25c28e83SPiotr Jasiukajtis ja .neg_nan_reentry 73*25c28e83SPiotr Jasiukajtis jb .zero_or_less 74*25c28e83SPiotr Jasiukajtis movl 4(%esp),%ecx / ecx <-- lo_32(x) 75*25c28e83SPiotr Jasiukajtis cmpl $0,%ecx / is x NaN or -INF? 76*25c28e83SPiotr Jasiukajtis jne .neg_nan_reentry / branch if x is NaN with signbit = 1 77*25c28e83SPiotr Jasiukajtis / x = -INF 78*25c28e83SPiotr Jasiukajtis.less_than_0: 79*25c28e83SPiotr Jasiukajtis pushl %ebp 80*25c28e83SPiotr Jasiukajtis movl %esp,%ebp 81*25c28e83SPiotr Jasiukajtis PIC_SETUP(2) 82*25c28e83SPiotr Jasiukajtis pushl $17 83*25c28e83SPiotr Jasiukajtis.merge: 84*25c28e83SPiotr Jasiukajtis fstp %st(0) / stack empty 85*25c28e83SPiotr Jasiukajtis pushl 12(%ebp) 86*25c28e83SPiotr Jasiukajtis pushl 8(%ebp) 87*25c28e83SPiotr Jasiukajtis pushl 12(%ebp) 88*25c28e83SPiotr Jasiukajtis pushl 8(%ebp) 89*25c28e83SPiotr Jasiukajtis call PIC_F(_SVID_libm_err) 90*25c28e83SPiotr Jasiukajtis addl $20,%esp 91*25c28e83SPiotr Jasiukajtis PIC_WRAPUP 92*25c28e83SPiotr Jasiukajtis leave 93*25c28e83SPiotr Jasiukajtis ret 94*25c28e83SPiotr Jasiukajtis .align 4 95*25c28e83SPiotr Jasiukajtis SET_SIZE(log) 96