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 2005 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 "synonyms.h" 30 #include <sys/types.h> 31 #include "base_conversion.h" 32 #include <sys/isa_defs.h> 33 34 /* 35 * Miscellaneous support routines used in base conversion 36 */ 37 38 static const union { 39 unsigned int u[2]; 40 double d; 41 } C[] = { 42 #ifdef _LITTLE_ENDIAN 43 { 0x00000000u, 0x00100000u }, 44 { 0x00000001u, 0x7ff00000u } 45 #else 46 { 0x00100000u, 0x00000000u }, 47 { 0x7ff00000u, 0x00000001u } 48 #endif 49 }; 50 51 #define minnormal C[0].d 52 #define signalingnan C[1].d 53 54 /* raise the floating point exceptions indicated by ef */ 55 void 56 __base_conversion_set_exception(fp_exception_field_type ef) 57 { 58 double t; 59 volatile double tstored; 60 61 if (ef == (1 << fp_inexact)) { 62 t = 9.999999962747097015E-1; 63 /* 64 * 28 sig bits so product isn't inexact in extended 65 * accumulator, causing two inexact traps. 66 */ 67 } else if ((ef & (1 << fp_invalid)) != 0) { 68 t = signalingnan; 69 } else if ((ef & (1 << fp_overflow)) != 0) { 70 t = 4.149515553422842866E+180; 71 /* 72 * 28 sig bits so product isn't inexact in extended 73 * accumulator, causing inexact trap prior to overflow trap 74 * on store. 75 */ 76 } else if ((ef & (1 << fp_underflow)) != 0) { 77 t = minnormal; 78 } else 79 return; 80 81 /* Storage forces exception */ 82 tstored = t * t; 83 #if defined(__lint) 84 tstored = tstored; 85 #endif 86 } 87 88 /* 89 * The following routine is no longer used in libc, but we have 90 * to leave it for now because it's still used by Sun's old Fortran 91 * runtime libraries. Today this is a bug; in the days of SunOS 4.x, 92 * when the relevant design decisions were made, it was a feature. 93 */ 94 enum fp_class_type 95 __class_quadruple(quadruple *x) 96 { 97 quadruple_equivalence kluge; 98 99 kluge.x = *x; 100 if (kluge.f.msw.exponent == 0) { /* 0 or sub */ 101 if ((kluge.f.msw.significand == 0) && 102 (kluge.f.significand2 == 0) && 103 (kluge.f.significand3 == 0) && 104 (kluge.f.significand4 == 0)) 105 return (fp_zero); 106 else 107 return (fp_subnormal); 108 } else if (kluge.f.msw.exponent == 0x7fff) { /* inf or nan */ 109 if ((kluge.f.msw.significand == 0) && 110 (kluge.f.significand2 == 0) && 111 (kluge.f.significand3 == 0) && 112 (kluge.f.significand4 == 0)) 113 return (fp_infinity); 114 else if ((kluge.f.msw.significand & 0xffff) >= 115 (unsigned int)0x8000) 116 return (fp_quiet); 117 else 118 return (fp_signaling); 119 } else 120 return (fp_normal); 121 } 122