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 2005 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 "ilogbl.s" 30*25c28e83SPiotr Jasiukajtis 31*25c28e83SPiotr Jasiukajtis#include "libm.h" 32*25c28e83SPiotr JasiukajtisLIBM_ANSI_PRAGMA_WEAK(ilogbl,function) 33*25c28e83SPiotr Jasiukajtis#include "xpg6.h" 34*25c28e83SPiotr Jasiukajtis 35*25c28e83SPiotr Jasiukajtis .data 36*25c28e83SPiotr Jasiukajtis .align 16 37*25c28e83SPiotr Jasiukajtistwo63: .4byte 0x0,0x43d00000 / 2**63 38*25c28e83SPiotr Jasiukajtis 39*25c28e83SPiotr Jasiukajtis ENTRY(ilogbl) 40*25c28e83SPiotr Jasiukajtis movq 16(%rsp),%rax / eax <-- sign and bexp of x 41*25c28e83SPiotr Jasiukajtis andq $0x7fff,%rax / eax <-- bexp(x) 42*25c28e83SPiotr Jasiukajtis jz .bexp_0 / jump iff x is 0 or subnormal 43*25c28e83SPiotr Jasiukajtis / here, biased exponent is non-zero 44*25c28e83SPiotr Jasiukajtis testl $0x80000000,12(%rsp) / test msb of hi_32(sgnfcnd(x)) 45*25c28e83SPiotr Jasiukajtis jz .ilogbl_not_finite / jump if unsupported format 46*25c28e83SPiotr Jasiukajtis cmpq $0x7fff,%rax 47*25c28e83SPiotr Jasiukajtis je .ilogbl_not_finite 48*25c28e83SPiotr Jasiukajtis subq $16383,%rax / unbias exponent by 16383 = 0x3fff 49*25c28e83SPiotr Jasiukajtis ret 50*25c28e83SPiotr Jasiukajtis 51*25c28e83SPiotr Jasiukajtis.ilogbl_not_finite: 52*25c28e83SPiotr Jasiukajtis movq $0x7fffffff,%rax / x is NaN/inf/unsup 53*25c28e83SPiotr Jasiukajtis jmp 0f 54*25c28e83SPiotr Jasiukajtis 55*25c28e83SPiotr Jasiukajtis.bexp_0: 56*25c28e83SPiotr Jasiukajtis movq 8(%rsp),%rax / rax <-- sgnfcnd(x) 57*25c28e83SPiotr Jasiukajtis orq %rax,%rax 58*25c28e83SPiotr Jasiukajtis jnz .ilogbl_subnorm / jump iff x is subnormal 59*25c28e83SPiotr Jasiukajtis movq $-2147483647,%rax / x is +/-0, so return 1-2^31 60*25c28e83SPiotr Jasiukajtis0: 61*25c28e83SPiotr Jasiukajtis PIC_SETUP(0) 62*25c28e83SPiotr Jasiukajtis PIC_G_LOAD(movzwq,__xpg6,rcx) 63*25c28e83SPiotr Jasiukajtis PIC_WRAPUP 64*25c28e83SPiotr Jasiukajtis andl $_C99SUSv3_ilogb_0InfNaN_raises_invalid,%ecx 65*25c28e83SPiotr Jasiukajtis cmpl $0,%ecx 66*25c28e83SPiotr Jasiukajtis je 1f 67*25c28e83SPiotr Jasiukajtis fldz 68*25c28e83SPiotr Jasiukajtis fdivp %st,%st(0) / raise invalid as per SUSv3 69*25c28e83SPiotr Jasiukajtis1: 70*25c28e83SPiotr Jasiukajtis ret 71*25c28e83SPiotr Jasiukajtis 72*25c28e83SPiotr Jasiukajtis 73*25c28e83SPiotr Jasiukajtis.ilogbl_subnorm: / subnormal or pseudo-denormal input 74*25c28e83SPiotr Jasiukajtis fldt 8(%rsp) / push x, setting D-flag 75*25c28e83SPiotr Jasiukajtis PIC_SETUP(1) 76*25c28e83SPiotr Jasiukajtis fmull PIC_L(two63) / x*2**63 77*25c28e83SPiotr Jasiukajtis PIC_WRAPUP 78*25c28e83SPiotr Jasiukajtis subq $16,%rsp 79*25c28e83SPiotr Jasiukajtis fstpt (%rsp) 80*25c28e83SPiotr Jasiukajtis movq $0x7fff,%rax 81*25c28e83SPiotr Jasiukajtis andq 8(%rsp),%rax / eax <-- sign and bexp of x*2**63 82*25c28e83SPiotr Jasiukajtis subq $16445,%rax / unbias it by (16,383 + 63) 83*25c28e83SPiotr Jasiukajtis addq $16,%rsp 84*25c28e83SPiotr Jasiukajtis ret 85*25c28e83SPiotr Jasiukajtis .align 16 86*25c28e83SPiotr Jasiukajtis SET_SIZE(ilogbl) 87