1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1988 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "base_conversion.h" 30 31 /* The following should be coded as inline expansion templates. */ 32 33 /* 34 * Fundamental utilities that multiply two shorts into a unsigned long, add 35 * carry, compute quotient and remainder in underlying base, and return 36 * quo<<16 | rem as a unsigned long. 37 */ 38 39 /* 40 * C compilers tend to generate bad code - forcing full unsigned long by 41 * unsigned long multiplies when what is really wanted is the unsigned long 42 * product of half-long operands. Similarly the quotient and remainder are 43 * all half-long. So these functions should really be implemented by inline 44 * expansion templates. 45 */ 46 47 /* p = x * y + c ; return p */ 48 unsigned long 49 _umac(_BIG_FLOAT_DIGIT x, _BIG_FLOAT_DIGIT y, unsigned long c) 50 { 51 return (x * (unsigned long) y + c); 52 } 53 54 /* p = x + c ; return (p/10000 << 16 | p%10000) */ 55 unsigned long 56 _carry_in_b10000(_BIG_FLOAT_DIGIT x, long unsigned c) 57 { 58 unsigned long p = x + c ; 59 60 return ((p / 10000) << 16) | (p % 10000); 61 } 62 63 void 64 _carry_propagate_two(unsigned long carry, _BIG_FLOAT_DIGIT *psignificand) 65 { 66 /* 67 * Propagate carries in a base-2**16 significand. 68 */ 69 70 long unsigned p; 71 int j; 72 73 j = 0; 74 while (carry != 0) { 75 p = _carry_in_b65536(psignificand[j],carry); 76 psignificand[j++] = (_BIG_FLOAT_DIGIT) (p & 0xffff); 77 carry = p >> 16; 78 } 79 } 80 81 void 82 _carry_propagate_ten(unsigned long carry, _BIG_FLOAT_DIGIT *psignificand) 83 { 84 /* 85 * Propagate carries in a base-10**4 significand. 86 */ 87 88 int j; 89 unsigned long p; 90 91 j = 0; 92 while (carry != 0) { 93 p = _carry_in_b10000(psignificand[j],carry); 94 psignificand[j++] = (_BIG_FLOAT_DIGIT) (p & 0xffff); 95 carry = p >> 16; 96 } 97 } 98