125c28e83SPiotr Jasiukajtis/* 225c28e83SPiotr Jasiukajtis * CDDL HEADER START 325c28e83SPiotr Jasiukajtis * 425c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 525c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 625c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 725c28e83SPiotr Jasiukajtis * 825c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 925c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 1025c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions 1125c28e83SPiotr Jasiukajtis * and limitations under the License. 1225c28e83SPiotr Jasiukajtis * 1325c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 1425c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 1525c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 1625c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 1725c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 1825c28e83SPiotr Jasiukajtis * 1925c28e83SPiotr Jasiukajtis * CDDL HEADER END 2025c28e83SPiotr Jasiukajtis */ 2125c28e83SPiotr Jasiukajtis/* 2225c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 2325c28e83SPiotr Jasiukajtis */ 2425c28e83SPiotr Jasiukajtis/* 2525c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 2625c28e83SPiotr Jasiukajtis * Use is subject to license terms. 2725c28e83SPiotr Jasiukajtis */ 2825c28e83SPiotr Jasiukajtis 2925c28e83SPiotr Jasiukajtis .file "lround.s" 3025c28e83SPiotr Jasiukajtis 3125c28e83SPiotr Jasiukajtis#include "libm.h" 3225c28e83SPiotr JasiukajtisLIBM_ANSI_PRAGMA_WEAK(lround,function) 3325c28e83SPiotr Jasiukajtis 3425c28e83SPiotr Jasiukajtis .section .rodata 3525c28e83SPiotr Jasiukajtis .align 4 3625c28e83SPiotr Jasiukajtis.Lhalf: .float 0.5 3725c28e83SPiotr Jasiukajtis 3825c28e83SPiotr Jasiukajtis ENTRY(lround) 3925c28e83SPiotr Jasiukajtis movl %esp,%ecx 4025c28e83SPiotr Jasiukajtis subl $8,%esp 4125c28e83SPiotr Jasiukajtis fstcw -8(%ecx) 4225c28e83SPiotr Jasiukajtis fldl 4(%ecx) 4325c28e83SPiotr Jasiukajtis movw -8(%ecx),%dx 4425c28e83SPiotr Jasiukajtis andw $0xf3ff,%dx 4525c28e83SPiotr Jasiukajtis movw %dx,-4(%ecx) 4625c28e83SPiotr Jasiukajtis fldcw -4(%ecx) / set RD = to_nearest 4725c28e83SPiotr Jasiukajtis fld %st(0) 4825c28e83SPiotr Jasiukajtis frndint / [x],x 4925c28e83SPiotr Jasiukajtis fstcw -4(%ecx) 5025c28e83SPiotr Jasiukajtis movw -4(%ecx),%dx 5125c28e83SPiotr Jasiukajtis andw $0xf3ff,%dx 5225c28e83SPiotr Jasiukajtis movw -8(%ecx),%ax 5325c28e83SPiotr Jasiukajtis andw $0x0c00,%ax 5425c28e83SPiotr Jasiukajtis orw %dx,%ax 5525c28e83SPiotr Jasiukajtis movw %ax,-8(%ecx) 5625c28e83SPiotr Jasiukajtis fldcw -8(%ecx) / restore RD 5725c28e83SPiotr Jasiukajtis fucom / check if x is already an integer 5825c28e83SPiotr Jasiukajtis fstsw %ax 5925c28e83SPiotr Jasiukajtis sahf 6025c28e83SPiotr Jasiukajtis jp 0f 6125c28e83SPiotr Jasiukajtis je 0f 6225c28e83SPiotr Jasiukajtis fxch / x,[x] 6325c28e83SPiotr Jasiukajtis fsub %st(1),%st / x-[x],[x] 6425c28e83SPiotr Jasiukajtis fabs / |x-[x]|,[x] 6525c28e83SPiotr Jasiukajtis PIC_SETUP(1) 6625c28e83SPiotr Jasiukajtis fcoms PIC_L(.Lhalf) 6725c28e83SPiotr Jasiukajtis PIC_WRAPUP 6825c28e83SPiotr Jasiukajtis fnstsw %ax 6925c28e83SPiotr Jasiukajtis sahf 70*55fea89dSDan Cross jae 2f / if |x-[x]| = 0.5 goto halfway, 7125c28e83SPiotr Jasiukajtis / most cases will not take branch. 7225c28e83SPiotr Jasiukajtis0: 7325c28e83SPiotr Jasiukajtis fstp %st(0) 7425c28e83SPiotr Jasiukajtis1: 7525c28e83SPiotr Jasiukajtis fistpl -8(%ecx) 7625c28e83SPiotr Jasiukajtis fwait 7725c28e83SPiotr Jasiukajtis movl -8(%ecx),%eax 7825c28e83SPiotr Jasiukajtis addl $8,%esp 7925c28e83SPiotr Jasiukajtis ret 8025c28e83SPiotr Jasiukajtis2: 8125c28e83SPiotr Jasiukajtis / x = n+0.5, recompute lround(x) as x+sign(x)*0.5 8225c28e83SPiotr Jasiukajtis fldl 4(%ecx) / x, 0.5, [x] 8325c28e83SPiotr Jasiukajtis movl 8(%ecx),%eax / high part of x 8425c28e83SPiotr Jasiukajtis andl $0x80000000,%eax 8525c28e83SPiotr Jasiukajtis jnz 3f 8625c28e83SPiotr Jasiukajtis faddp 8725c28e83SPiotr Jasiukajtis fstp %st(1) 8825c28e83SPiotr Jasiukajtis jmp 1b 8925c28e83SPiotr Jasiukajtis3: 9025c28e83SPiotr Jasiukajtis / here, x is negative, so return x-0.5 9125c28e83SPiotr Jasiukajtis fsubp %st,%st(1) / x-0.5,[x] 9225c28e83SPiotr Jasiukajtis fstp %st(1) 9325c28e83SPiotr Jasiukajtis jmp 1b 9425c28e83SPiotr Jasiukajtis .align 4 9525c28e83SPiotr Jasiukajtis SET_SIZE(lround) 96