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 /* 2325c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 2425c28e83SPiotr Jasiukajtis */ 2525c28e83SPiotr Jasiukajtis /* 2625c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 2725c28e83SPiotr Jasiukajtis * Use is subject to license terms. 2825c28e83SPiotr Jasiukajtis */ 2925c28e83SPiotr Jasiukajtis 30*ddc0e0b5SRichard Lowe #pragma weak __scalblnl = scalblnl 3125c28e83SPiotr Jasiukajtis 3225c28e83SPiotr Jasiukajtis #include "libm.h" 3325c28e83SPiotr Jasiukajtis #include <float.h> /* LDBL_MAX, LDBL_MIN */ 3425c28e83SPiotr Jasiukajtis 3525c28e83SPiotr Jasiukajtis #if defined(__sparc) 3625c28e83SPiotr Jasiukajtis #define XSET_EXP(k, x) ((int *) &x)[0] = (((int *) &x)[0] & ~0x7fff0000) | \ 3725c28e83SPiotr Jasiukajtis (k << 16) 3825c28e83SPiotr Jasiukajtis #define ISINFNANL(k, x) (k == 0x7fff) 3925c28e83SPiotr Jasiukajtis #define XTWOT_OFFSET 113 4025c28e83SPiotr Jasiukajtis static const long double xtwot = 10384593717069655257060992658440192.0L, 4125c28e83SPiotr Jasiukajtis /* 2^113 */ 4225c28e83SPiotr Jasiukajtis twomtm1 = 4.814824860968089632639944856462318296E-35L; /* 2^-114 */ 4325c28e83SPiotr Jasiukajtis #elif defined(__x86) 4425c28e83SPiotr Jasiukajtis #define XSET_EXP(k, x) ((int *) &x)[2] = (((int *) &x)[2] & ~0x7fff) | k 4525c28e83SPiotr Jasiukajtis #if defined(HANDLE_UNSUPPORTED) 4625c28e83SPiotr Jasiukajtis #define ISINFNANL(k, x) (k == 0x7fff || \ 4725c28e83SPiotr Jasiukajtis (k != 0 && (((int *) &x)[1] & 0x80000000) == 0)) 4825c28e83SPiotr Jasiukajtis #else 4925c28e83SPiotr Jasiukajtis #define ISINFNANL(k, x) (k == 0x7fff) 5025c28e83SPiotr Jasiukajtis #endif 5125c28e83SPiotr Jasiukajtis #define XTWOT_OFFSET 64 5225c28e83SPiotr Jasiukajtis static const long double xtwot = 18446744073709551616.0L, /* 2^64 */ 5325c28e83SPiotr Jasiukajtis twomtm1 = 2.7105054312137610850186E-20L; /* 2^-65 */ 5425c28e83SPiotr Jasiukajtis #endif 5525c28e83SPiotr Jasiukajtis 5625c28e83SPiotr Jasiukajtis long double 5725c28e83SPiotr Jasiukajtis scalblnl(long double x, long n) { 5825c28e83SPiotr Jasiukajtis int k = XBIASED_EXP(x); 5925c28e83SPiotr Jasiukajtis 6025c28e83SPiotr Jasiukajtis if (ISINFNANL(k, x)) 6125c28e83SPiotr Jasiukajtis return (x + x); 6225c28e83SPiotr Jasiukajtis if (ISZEROL(x) || n == 0) 6325c28e83SPiotr Jasiukajtis return (x); 6425c28e83SPiotr Jasiukajtis if (k == 0) { 6525c28e83SPiotr Jasiukajtis x *= xtwot; 6625c28e83SPiotr Jasiukajtis k = XBIASED_EXP(x) - XTWOT_OFFSET; 6725c28e83SPiotr Jasiukajtis } 6825c28e83SPiotr Jasiukajtis k += (int) n; 6925c28e83SPiotr Jasiukajtis if (n > 50000 || k > 0x7ffe) 7025c28e83SPiotr Jasiukajtis return (LDBL_MAX * copysignl(LDBL_MAX, x)); 7125c28e83SPiotr Jasiukajtis if (n < -50000 || k <= -XTWOT_OFFSET - 1) 7225c28e83SPiotr Jasiukajtis return (LDBL_MIN * copysignl(LDBL_MIN, x)); 7325c28e83SPiotr Jasiukajtis if (k > 0) { 7425c28e83SPiotr Jasiukajtis XSET_EXP(k, x); 7525c28e83SPiotr Jasiukajtis return (x); 7625c28e83SPiotr Jasiukajtis } 7725c28e83SPiotr Jasiukajtis k += XTWOT_OFFSET + 1; 7825c28e83SPiotr Jasiukajtis XSET_EXP(k, x); 7925c28e83SPiotr Jasiukajtis return (x * twomtm1); 8025c28e83SPiotr Jasiukajtis } 81