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 2005 Sun Microsystems, Inc. All rights reserved. 2625c28e83SPiotr Jasiukajtis * Use is subject to license terms. 2725c28e83SPiotr Jasiukajtis */ 2825c28e83SPiotr Jasiukajtis 2925c28e83SPiotr Jasiukajtis .file "ilogbl.s" 3025c28e83SPiotr Jasiukajtis 3125c28e83SPiotr Jasiukajtis#include "libm.h" 3225c28e83SPiotr JasiukajtisLIBM_ANSI_PRAGMA_WEAK(ilogbl,function) 3325c28e83SPiotr Jasiukajtis#include "xpg6.h" 3425c28e83SPiotr Jasiukajtis 3525c28e83SPiotr Jasiukajtis .data 3625c28e83SPiotr Jasiukajtis .align 16 3725c28e83SPiotr Jasiukajtistwo63: .4byte 0x0,0x43d00000 / 2**63 3825c28e83SPiotr Jasiukajtis 3925c28e83SPiotr Jasiukajtis ENTRY(ilogbl) 4025c28e83SPiotr Jasiukajtis movq 16(%rsp),%rax / eax <-- sign and bexp of x 4125c28e83SPiotr Jasiukajtis andq $0x7fff,%rax / eax <-- bexp(x) 4225c28e83SPiotr Jasiukajtis jz .bexp_0 / jump iff x is 0 or subnormal 4325c28e83SPiotr Jasiukajtis / here, biased exponent is non-zero 4425c28e83SPiotr Jasiukajtis testl $0x80000000,12(%rsp) / test msb of hi_32(sgnfcnd(x)) 4525c28e83SPiotr Jasiukajtis jz .ilogbl_not_finite / jump if unsupported format 4625c28e83SPiotr Jasiukajtis cmpq $0x7fff,%rax 4725c28e83SPiotr Jasiukajtis je .ilogbl_not_finite 4825c28e83SPiotr Jasiukajtis subq $16383,%rax / unbias exponent by 16383 = 0x3fff 4925c28e83SPiotr Jasiukajtis ret 5025c28e83SPiotr Jasiukajtis 5125c28e83SPiotr Jasiukajtis.ilogbl_not_finite: 5225c28e83SPiotr Jasiukajtis movq $0x7fffffff,%rax / x is NaN/inf/unsup 5325c28e83SPiotr Jasiukajtis jmp 0f 5425c28e83SPiotr Jasiukajtis 5525c28e83SPiotr Jasiukajtis.bexp_0: 5625c28e83SPiotr Jasiukajtis movq 8(%rsp),%rax / rax <-- sgnfcnd(x) 5725c28e83SPiotr Jasiukajtis orq %rax,%rax 5825c28e83SPiotr Jasiukajtis jnz .ilogbl_subnorm / jump iff x is subnormal 5925c28e83SPiotr Jasiukajtis movq $-2147483647,%rax / x is +/-0, so return 1-2^31 6025c28e83SPiotr Jasiukajtis0: 6125c28e83SPiotr Jasiukajtis PIC_SETUP(0) 6225c28e83SPiotr Jasiukajtis PIC_G_LOAD(movzwq,__xpg6,rcx) 6325c28e83SPiotr Jasiukajtis PIC_WRAPUP 6425c28e83SPiotr Jasiukajtis andl $_C99SUSv3_ilogb_0InfNaN_raises_invalid,%ecx 6525c28e83SPiotr Jasiukajtis cmpl $0,%ecx 6625c28e83SPiotr Jasiukajtis je 1f 6725c28e83SPiotr Jasiukajtis fldz 6825c28e83SPiotr Jasiukajtis fdivp %st,%st(0) / raise invalid as per SUSv3 6925c28e83SPiotr Jasiukajtis1: 7025c28e83SPiotr Jasiukajtis ret 7125c28e83SPiotr Jasiukajtis 7225c28e83SPiotr Jasiukajtis 7325c28e83SPiotr Jasiukajtis.ilogbl_subnorm: / subnormal or pseudo-denormal input 7425c28e83SPiotr Jasiukajtis fldt 8(%rsp) / push x, setting D-flag 7525c28e83SPiotr Jasiukajtis PIC_SETUP(1) 7625c28e83SPiotr Jasiukajtis fmull PIC_L(two63) / x*2**63 7725c28e83SPiotr Jasiukajtis PIC_WRAPUP 7825c28e83SPiotr Jasiukajtis subq $16,%rsp 7925c28e83SPiotr Jasiukajtis fstpt (%rsp) 8025c28e83SPiotr Jasiukajtis movq $0x7fff,%rax 8125c28e83SPiotr Jasiukajtis andq 8(%rsp),%rax / eax <-- sign and bexp of x*2**63 8225c28e83SPiotr Jasiukajtis subq $16445,%rax / unbias it by (16,383 + 63) 8325c28e83SPiotr Jasiukajtis addq $16,%rsp 8425c28e83SPiotr Jasiukajtis ret 8525c28e83SPiotr Jasiukajtis .align 16 8625c28e83SPiotr Jasiukajtis SET_SIZE(ilogbl) 87