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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include "lint.h" 28 #include <sys/types.h> 29 #include "base_conversion.h" 30 #include <sys/isa_defs.h> 31 32 /* 33 * Miscellaneous support routines used in base conversion 34 */ 35 36 static const union { 37 unsigned int u[2]; 38 double d; 39 } C[] = { 40 #ifdef _LITTLE_ENDIAN 41 { 0x00000000u, 0x00100000u }, 42 { 0x00000001u, 0x7ff00000u } 43 #else 44 { 0x00100000u, 0x00000000u }, 45 { 0x7ff00000u, 0x00000001u } 46 #endif 47 }; 48 49 #define minnormal C[0].d 50 #define signalingnan C[1].d 51 52 /* raise the floating point exceptions indicated by ef */ 53 void 54 __base_conversion_set_exception(fp_exception_field_type ef) 55 { 56 double t; 57 volatile double tstored __unused; 58 59 if (ef == (1 << fp_inexact)) { 60 t = 9.999999962747097015E-1; 61 /* 62 * 28 sig bits so product isn't inexact in extended 63 * accumulator, causing two inexact traps. 64 */ 65 } else if ((ef & (1 << fp_invalid)) != 0) { 66 t = signalingnan; 67 } else if ((ef & (1 << fp_overflow)) != 0) { 68 t = 4.149515553422842866E+180; 69 /* 70 * 28 sig bits so product isn't inexact in extended 71 * accumulator, causing inexact trap prior to overflow trap 72 * on store. 73 */ 74 } else if ((ef & (1 << fp_underflow)) != 0) { 75 t = minnormal; 76 } else 77 return; 78 79 /* Storage forces exception */ 80 tstored = t * t; 81 #if defined(__lint) 82 tstored = tstored; 83 #endif 84 } 85 86 /* 87 * The following routine is no longer used in libc, but we have 88 * to leave it for now because it's still used by Sun's old Fortran 89 * runtime libraries. Today this is a bug; in the days of SunOS 4.x, 90 * when the relevant design decisions were made, it was a feature. 91 */ 92 enum fp_class_type 93 __class_quadruple(quadruple *x) 94 { 95 quadruple_equivalence kluge; 96 97 kluge.x = *x; 98 if (kluge.f.msw.exponent == 0) { /* 0 or sub */ 99 if ((kluge.f.msw.significand == 0) && 100 (kluge.f.significand2 == 0) && 101 (kluge.f.significand3 == 0) && 102 (kluge.f.significand4 == 0)) 103 return (fp_zero); 104 else 105 return (fp_subnormal); 106 } else if (kluge.f.msw.exponent == 0x7fff) { /* inf or nan */ 107 if ((kluge.f.msw.significand == 0) && 108 (kluge.f.significand2 == 0) && 109 (kluge.f.significand3 == 0) && 110 (kluge.f.significand4 == 0)) 111 return (fp_infinity); 112 else if ((kluge.f.msw.significand & 0xffff) >= 113 (unsigned int)0x8000) 114 return (fp_quiet); 115 else 116 return (fp_signaling); 117 } else 118 return (fp_normal); 119 } 120