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 (c) 1986 by Sun Microsystems, Inc. 24 */ 25 #ident "%Z%%M% %I% %E% SMI" /* SunOS-4.1 1.7 88/12/06 */ 26 27 #include <sys/fpu/fpu_simulator.h> 28 #include <sys/fpu/globals.h> 29 30 enum fcc_type 31 _fp_compare(pfpsd, px, py, strict) 32 fp_simd_type *pfpsd; /* simulator data */ 33 unpacked *px, *py; 34 int strict; 35 /* 36 * 0 if quiet NaN unexceptional, 1 if 37 * exceptional 38 */ 39 { 40 enum fcc_type cc; 41 int n; 42 43 if ((px->fpclass == fp_quiet) || (py->fpclass == fp_quiet) || 44 (px->fpclass == fp_signaling) || (py->fpclass == fp_signaling)) { 45 if (strict) /* NaN */ 46 fpu_set_exception(pfpsd, fp_invalid); 47 cc = fcc_unordered; 48 } else if ((px->fpclass == fp_zero) && (py->fpclass == fp_zero)) 49 cc = fcc_equal; 50 /* both zeros */ 51 else if (px->sign < py->sign) 52 cc = fcc_greater; 53 else if (px->sign > py->sign) 54 cc = fcc_less; 55 else { /* signs the same, compute magnitude cc */ 56 if ((int) px->fpclass > (int) py->fpclass) 57 cc = fcc_greater; 58 else if ((int) px->fpclass < (int) py->fpclass) 59 cc = fcc_less; 60 else 61 /* same classes */ if (px->fpclass == fp_infinity) 62 cc = fcc_equal; /* same infinity */ 63 else if (px->exponent > py->exponent) 64 cc = fcc_greater; 65 else if (px->exponent < py->exponent) 66 cc = fcc_less; 67 else { /* equal exponents */ 68 n = fpu_cmpli(px->significand, py->significand, 4); 69 if (n > 0) cc = fcc_greater; 70 else if (n < 0) cc = fcc_less; 71 else cc = fcc_equal; 72 } 73 if (px->sign) 74 switch (cc) { /* negative numbers */ 75 case fcc_less: 76 cc = fcc_greater; 77 break; 78 case fcc_greater: 79 cc = fcc_less; 80 break; 81 } 82 } 83 return (cc); 84 } 85