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annotate src/share/vm/runtime/sharedRuntimeMath.hpp @ 20288:a073be2ce5c2

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8049043: Load variable through a pointer of an incompatible type in hotspot/src/share/vm/runtime/sharedRuntimeMath.hpp Summary: Fixed parfait warnings caused by __HI and __LO macros in sharedRuntimeMath.hpp by using a union. Reviewed-by: kvn
author thartmann
date Tue, 29 Jul 2014 13:56:29 +0200
parents 631c3a4ea10c
children 69ea58782b1a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIMEMATH_HPP
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26 #define SHARE_VM_RUNTIME_SHAREDRUNTIMEMATH_HPP
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27
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28 #include <math.h>
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29
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30 // Used to access the lower/higher 32 bits of a double
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31 typedef union {
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32 double d;
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33 struct {
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34 #ifdef VM_LITTLE_ENDIAN
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35 int lo;
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36 int hi;
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37 #else
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38 int hi;
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39 int lo;
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40 #endif
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41 } split;
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42 } DoubleIntConv;
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43
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44 static inline int high(double d) {
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45 DoubleIntConv x = { d };
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46 return x.split.hi;
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47 }
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48
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49 static inline int low(double d) {
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50 DoubleIntConv x = { d };
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51 return x.split.lo;
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52 }
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53
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54 static inline void set_high(double* d, int high) {
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55 DoubleIntConv conv = { *d };
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56 conv.split.hi = high;
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57 *d = conv.d;
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58 }
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59
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60 static inline void set_low(double* d, int low) {
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61 DoubleIntConv conv = { *d };
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62 conv.split.lo = low;
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63 *d = conv.d;
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64 }
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65
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66 static double copysignA(double x, double y) {
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67 DoubleIntConv convX = { x };
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68 convX.split.hi = (convX.split.hi & 0x7fffffff) | (high(y) & 0x80000000);
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69 return convX.d;
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70 }
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71
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72 /*
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73 * ====================================================
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74 * Copyright (c) 1998 Oracle and/or its affiliates. All rights reserved.
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75 *
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76 * Developed at SunSoft, a Sun Microsystems, Inc. business.
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77 * Permission to use, copy, modify, and distribute this
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78 * software is freely granted, provided that this notice
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79 * is preserved.
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80 * ====================================================
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81 */
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82
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83 /*
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84 * scalbn (double x, int n)
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85 * scalbn(x,n) returns x* 2**n computed by exponent
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86 * manipulation rather than by actually performing an
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87 * exponentiation or a multiplication.
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88 */
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89
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90 static const double
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91 two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
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92 twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
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93 hugeX = 1.0e+300,
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94 tiny = 1.0e-300;
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95
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96 static double scalbnA(double x, int n) {
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97 int k,hx,lx;
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98 hx = high(x);
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99 lx = low(x);
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100 k = (hx&0x7ff00000)>>20; /* extract exponent */
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101 if (k==0) { /* 0 or subnormal x */
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102 if ((lx|(hx&0x7fffffff))==0) return x; /* +-0 */
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103 x *= two54;
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104 hx = high(x);
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105 k = ((hx&0x7ff00000)>>20) - 54;
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106 if (n< -50000) return tiny*x; /*underflow*/
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107 }
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108 if (k==0x7ff) return x+x; /* NaN or Inf */
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109 k = k+n;
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110 if (k > 0x7fe) return hugeX*copysignA(hugeX,x); /* overflow */
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111 if (k > 0) { /* normal result */
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112 set_high(&x, (hx&0x800fffff)|(k<<20));
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113 return x;
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114 }
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115 if (k <= -54) {
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116 if (n > 50000) /* in case integer overflow in n+k */
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117 return hugeX*copysignA(hugeX,x); /*overflow*/
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118 else return tiny*copysignA(tiny,x); /*underflow*/
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119 }
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120 k += 54; /* subnormal result */
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121 set_high(&x, (hx&0x800fffff)|(k<<20));
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122 return x*twom54;
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123 }
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124
631c3a4ea10c 8043301: Duplicate definitions in vm/runtime/sharedRuntimeTrans.cpp versus math.h in VS2013
lfoltan
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125 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIMEMATH_HPP