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 Jasiukajtis unsigned int i[4];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis long double q;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis unsigned int i;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* handle trivial cases */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (hx > 0x401e0000) { /* |x| > 2^31 + ... or x is nan */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* convert an out-of-range float */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return ((long) tt.f);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis } else if ((hx | xx.i[1] | xx.i[2] | xx.i[3]) == 0) /* x is zero */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* get the rounding mode */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* flip the sense of directed roundings if x is negative */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* handle |x| < 1 */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis dummy = 1.0e30F; /* x is nonzero, so raise inexact */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (rm == FSR_RP || (rm == FSR_RN && (hx >= 0x3ffe0000 &&
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis ((hx & 0xffff) | xx.i[1] | xx.i[2] | xx.i[3]))))
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* extract the integer and fractional parts of x */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis j = 0x406f - (hx >> 16); /* 91 <= j <= 112 */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis frac = ((xx.i[0] << 1) << (127 - j)) | (xx.i[1] >> (j - 96));
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (((xx.i[1] << 1) << (127 - j)) | xx.i[2] | xx.i[3])
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis } else { /* 91 <= j <= 95 */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis l = (xx.i[0] << (96 - j)) | (xx.i[1] >> (j - 64));
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis frac = (xx.i[1] << (96 - j)) | (xx.i[2] >> (j - 64));
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (frac && (rm == FSR_RP || (rm == FSR_RN && (frac > 0x80000000U ||
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* check for result out of range (note that z is |x| at this point) */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (l > 0x80000000U || (l == 0x80000000U && !sx)) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return ((long) tt.f);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* raise inexact if need be */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* negate result if need be */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return ((long) l);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Note: The following code works on x86 (in the default rounding
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * precision mode), but one ought to just use the fistpl instruction
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis unsigned i[3];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis long double e;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* add and subtract a power of two to round x to an integer */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis /* now x is nan, inf, or integral */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return ((long) x);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#endif /* defined(__sparc) || defined(__x86) */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#endif /* defined(_ILP32) */