1*5d9d9091SRichard Lowe/* 2*5d9d9091SRichard Lowe * CDDL HEADER START 3*5d9d9091SRichard Lowe * 4*5d9d9091SRichard Lowe * The contents of this file are subject to the terms of the 5*5d9d9091SRichard Lowe * Common Development and Distribution License (the "License"). 6*5d9d9091SRichard Lowe * You may not use this file except in compliance with the License. 7*5d9d9091SRichard Lowe * 8*5d9d9091SRichard Lowe * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5d9d9091SRichard Lowe * or http://www.opensolaris.org/os/licensing. 10*5d9d9091SRichard Lowe * See the License for the specific language governing permissions 11*5d9d9091SRichard Lowe * and limitations under the License. 12*5d9d9091SRichard Lowe * 13*5d9d9091SRichard Lowe * When distributing Covered Code, include this CDDL HEADER in each 14*5d9d9091SRichard Lowe * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5d9d9091SRichard Lowe * If applicable, add the following below this CDDL HEADER, with the 16*5d9d9091SRichard Lowe * fields enclosed by brackets "[]" replaced with your own identifying 17*5d9d9091SRichard Lowe * information: Portions Copyright [yyyy] [name of copyright owner] 18*5d9d9091SRichard Lowe * 19*5d9d9091SRichard Lowe * CDDL HEADER END 20*5d9d9091SRichard Lowe */ 21*5d9d9091SRichard Lowe/* 22*5d9d9091SRichard Lowe * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*5d9d9091SRichard Lowe */ 24*5d9d9091SRichard Lowe/* 25*5d9d9091SRichard Lowe * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26*5d9d9091SRichard Lowe * Use is subject to license terms. 27*5d9d9091SRichard Lowe */ 28*5d9d9091SRichard Lowe 29*5d9d9091SRichard Lowe .file "log.s" 30*5d9d9091SRichard Lowe 31*5d9d9091SRichard Lowe#include "libm.h" 32*5d9d9091SRichard LoweLIBM_ANSI_PRAGMA_WEAK(log,function) 33*5d9d9091SRichard Lowe#include "libm_protos.h" 34*5d9d9091SRichard Lowe 35*5d9d9091SRichard Lowe ENTRY(log) 36*5d9d9091SRichard Lowe fldln2 / loge(2) 37*5d9d9091SRichard Lowe movl 8(%esp),%eax / eax <-- hi_32(x) 38*5d9d9091SRichard Lowe testl $0x80000000,%eax 39*5d9d9091SRichard Lowe jnz .maybe_0_or_less 40*5d9d9091SRichard Lowe testl $0x7fffffff,%eax 41*5d9d9091SRichard Lowe jz .maybe_0 42*5d9d9091SRichard Lowe fldl 4(%esp) / arg, loge(2) 43*5d9d9091SRichard Lowe fyl2x / loge(2)*log2(arg); ln(arg) 44*5d9d9091SRichard Lowe ret 45*5d9d9091SRichard Lowe 46*5d9d9091SRichard Lowe.maybe_0: 47*5d9d9091SRichard Lowe movl 4(%esp),%ecx / ecx <-- lo_32(x) 48*5d9d9091SRichard Lowe cmpl $0,%ecx 49*5d9d9091SRichard Lowe je .zero / no branch if x is +denormal 50*5d9d9091SRichard Lowe.neg_nan_reentry: 51*5d9d9091SRichard Lowe fldl 4(%esp) / arg, loge(2) 52*5d9d9091SRichard Lowe fyl2x / loge(2)*log2(arg); ln(arg) 53*5d9d9091SRichard Lowe ret 54*5d9d9091SRichard Lowe 55*5d9d9091SRichard Lowe.zero_or_less: 56*5d9d9091SRichard Lowe / x =< 0 57*5d9d9091SRichard Lowe testl $0x7fffffff,%eax 58*5d9d9091SRichard Lowe jnz .less_than_0 59*5d9d9091SRichard Lowe movl 4(%esp),%ecx / ecx <-- lo_32(x) 60*5d9d9091SRichard Lowe cmpl $0,%ecx 61*5d9d9091SRichard Lowe jne .less_than_0 / branch if x is -denormal 62*5d9d9091SRichard Lowe.zero: 63*5d9d9091SRichard Lowe / x = +/-0 64*5d9d9091SRichard Lowe pushl %ebp 65*5d9d9091SRichard Lowe movl %esp,%ebp 66*5d9d9091SRichard Lowe PIC_SETUP(1) 67*5d9d9091SRichard Lowe pushl $16 68*5d9d9091SRichard Lowe jmp .merge 69*5d9d9091SRichard Lowe 70*5d9d9091SRichard Lowe.maybe_0_or_less: 71*5d9d9091SRichard Lowe cmpl $0xfff00000,%eax / -INF below hi_32(x)? 72*5d9d9091SRichard Lowe ja .neg_nan_reentry 73*5d9d9091SRichard Lowe jb .zero_or_less 74*5d9d9091SRichard Lowe movl 4(%esp),%ecx / ecx <-- lo_32(x) 75*5d9d9091SRichard Lowe cmpl $0,%ecx / is x NaN or -INF? 76*5d9d9091SRichard Lowe jne .neg_nan_reentry / branch if x is NaN with signbit = 1 77*5d9d9091SRichard Lowe / x = -INF 78*5d9d9091SRichard Lowe.less_than_0: 79*5d9d9091SRichard Lowe pushl %ebp 80*5d9d9091SRichard Lowe movl %esp,%ebp 81*5d9d9091SRichard Lowe PIC_SETUP(2) 82*5d9d9091SRichard Lowe pushl $17 83*5d9d9091SRichard Lowe.merge: 84*5d9d9091SRichard Lowe fstp %st(0) / stack empty 85*5d9d9091SRichard Lowe pushl 12(%ebp) 86*5d9d9091SRichard Lowe pushl 8(%ebp) 87*5d9d9091SRichard Lowe pushl 12(%ebp) 88*5d9d9091SRichard Lowe pushl 8(%ebp) 89*5d9d9091SRichard Lowe call PIC_F(_SVID_libm_err) 90*5d9d9091SRichard Lowe addl $20,%esp 91*5d9d9091SRichard Lowe PIC_WRAPUP 92*5d9d9091SRichard Lowe leave 93*5d9d9091SRichard Lowe ret 94*5d9d9091SRichard Lowe .align 4 95*5d9d9091SRichard Lowe SET_SIZE(log) 96