25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER START
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * The contents of this file are subject to the terms of the
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Common Development and Distribution License (the "License").
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You may not use this file except in compliance with the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * or http://www.opensolaris.org/os/licensing.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * See the License for the specific language governing permissions
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * and limitations under the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
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25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER END
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Use is subject to license terms.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisstatic const double
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis twom54 = 5.5511151231257827021181583404541015625e-17;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisstatic const double two52 = 4503599627370496.0;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Normalize non-zero subnormal x and return biased exponent of x in [-51,0]
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis unsigned v = px[HIWORD] & ~0x80000000, w = px[LOWORD], t = v;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (t & 0xffff0000)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (t & 0xff00)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis v = (v << s) | w >> (32 - s);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis v = w << (s - 32);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis px[HIWORD] = (px[HIWORD] & 0x80000000) | v;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return (1 - s);
1ec68d336ba97cd53f46053ac10401d16014d075Richard Lowe#endif /* defined(__x86) */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return (x * one);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* now k is in the range -51..0 */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (k > n) /* integer overflow occurred */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* k is in the range 1..1023 */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (k < n) /* integer overflow occurred */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (k > 0x7fe)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis px[HIWORD] = (ix & ~0x7ff00000) | (k << 20);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis px[HIWORD] = (ix & ~0x7ff00000) | (k << 20);