| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "Float.h" |
| #include <decaf/lang/Integer.h> |
| #include <decaf/internal/util/FloatingPointParser.h> |
| #include <decaf/internal/util/NumberConverter.h> |
| |
| using namespace std; |
| using namespace decaf; |
| using namespace decaf::lang; |
| using namespace decaf::lang::exceptions; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| const float Float::MAX_VALUE = 3.40282346638528860e+38f; |
| const float Float::MIN_VALUE = 1.40129846432481707e-45f; |
| const float Float::NaN = 0.0f / 0.0f; |
| const float Float::POSITIVE_INFINITY = 1.0f / 0.0f; |
| const float Float::NEGATIVE_INFINITY = -1.0f / 0.0f; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| Float::Float( float value ) { |
| this->value = value; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| Float::Float( double value ) { |
| this->value = (float)value; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| Float::Float( const std::string& value ) throw( exceptions::NumberFormatException ) { |
| this->value = Float::parseFloat( value ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int Float::compareTo( const Float& f ) const { |
| return Float::compare( this->value, f.value ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int Float::compareTo( const float& f ) const { |
| return Float::compare( this->value, f ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| std::string Float::toString() const { |
| return Float::toString( this->value ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool Float::isInfinite() const { |
| return Float::isInfinite( this->value ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool Float::isNaN() const { |
| return Float::isNaN( this->value ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int Float::compare( float f1, float f2 ) { |
| |
| int i1, i2 = 0; |
| long NaNbits = Float::floatToIntBits( Float::NaN ); |
| |
| if( ( i1 = Float::floatToIntBits( f1 ) ) == NaNbits ) { |
| if( Float::floatToIntBits( f2 ) == NaNbits ) { |
| return 0; |
| } |
| return 1; |
| } |
| |
| if( ( i2 = Float::floatToIntBits( f2 ) ) == NaNbits ) { |
| return -1; |
| } |
| |
| if( f1 == f2 ) { |
| if( i1 == i2 ) { |
| return 0; |
| } |
| |
| // check for -0 |
| return i1 > i2 ? 1 : -1; |
| } |
| |
| return f1 > f2 ? 1 : -1; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int Float::floatToIntBits( float value ) { |
| |
| int intValue = 0; |
| memcpy( &intValue, &value, sizeof( float ) ); |
| |
| if( ( intValue & SINGLE_EXPONENT_MASK ) == SINGLE_EXPONENT_MASK ) |
| { |
| if( intValue & SINGLE_MANTISSA_MASK ) |
| { |
| return SINGLE_NAN_BITS; |
| } |
| } |
| |
| return intValue; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int Float::floatToRawIntBits( float value ) { |
| |
| int intValue = 0; |
| memcpy( &intValue, &value, sizeof( float ) ); |
| return intValue; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| float Float::intBitsToFloat( int bits ) { |
| |
| float floatValue = 0; |
| memcpy( &floatValue, &bits, sizeof( int ) ); |
| return floatValue; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool Float::isInfinite( float value ) { |
| return ( value == POSITIVE_INFINITY ) || ( value == NEGATIVE_INFINITY ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool Float::isNaN( float value ) { |
| return value != value; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| float Float::parseFloat( const std::string& value ) |
| throw ( exceptions::NumberFormatException ) { |
| |
| return internal::util::FloatingPointParser::parseFloat( value ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| std::string Float::toHexString( float value ) { |
| /* |
| * Reference: http://en.wikipedia.org/wiki/IEEE_754 |
| */ |
| if( value != value ) { |
| return "NaN"; |
| } |
| if( value == POSITIVE_INFINITY ) { |
| return "Infinity"; |
| } |
| if( value == NEGATIVE_INFINITY ) { |
| return "-Infinity"; |
| } |
| |
| unsigned int bitValue = Float::floatToIntBits( value ); |
| |
| bool negative = ( bitValue & 0x80000000 ) != 0; |
| // mask exponent bits and shift down |
| unsigned int exponent = ( bitValue & 0x7f800000 ) >> 23; |
| // mask significand bits and shift up |
| // significand is 23-bits, so we shift to treat it like 24-bits |
| unsigned int significand = ( bitValue & 0x007FFFFF ) << 1; |
| |
| if( exponent == 0 && significand == 0 ) { |
| return ( negative ? "-0x0.0p0" : "0x0.0p0" ); |
| } |
| |
| // Start with the correct sign and Hex indicator |
| std::string hexString( negative ? "-0x" : "0x" ); |
| |
| if( exponent == 0 ) { |
| // denormal (subnormal) value |
| hexString.append( "0." ); |
| // significand is 23-bits, so there can be 6 hex digits |
| unsigned int fractionDigits = 6; |
| // remove trailing hex zeros, so Integer.toHexString() won't print |
| // them |
| while( ( significand != 0 ) && ( ( significand & 0xF ) == 0 ) ) { |
| significand >>= 4; |
| fractionDigits--; |
| } |
| // this assumes Integer.toHexString() returns lowercase characters |
| std::string hexSignificand = Integer::toHexString( significand ); |
| |
| // if there are digits left, then insert some '0' chars first |
| if( significand != 0 && fractionDigits > hexSignificand.length() ) { |
| unsigned int digitDiff = fractionDigits - hexSignificand.length(); |
| while( digitDiff-- != 0 ) { |
| hexString.append( "0" ); |
| } |
| } |
| hexString.append( hexSignificand ); |
| hexString.append( "p-126" ); |
| } else { |
| // normal value |
| hexString.append( "1." ); |
| // significand is 23-bits, so there can be 6 hex digits |
| unsigned int fractionDigits = 6; |
| // remove trailing hex zeros, so Integer.toHexString() won't print |
| // them |
| while( (significand != 0) && ((significand & 0xF ) == 0 ) ) { |
| significand >>= 4; |
| fractionDigits--; |
| } |
| // this assumes Integer.toHexString() returns lowercase characters |
| std::string hexSignificand = Integer::toHexString( significand ); |
| |
| // if there are digits left, then insert some '0' chars first |
| if( significand != 0 && fractionDigits > hexSignificand.length() ) { |
| unsigned int digitDiff = fractionDigits - hexSignificand.length(); |
| while( digitDiff-- != 0 ) { |
| hexString.append( "0" ); |
| } |
| } |
| hexString.append( hexSignificand ); |
| hexString.append( "p" ); |
| // remove exponent's 'bias' and convert to a string |
| hexString.append( Integer::toString( exponent - 127 ) ); |
| } |
| |
| return hexString; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| std::string Float::toString( float value ) { |
| return internal::util::NumberConverter::convert( value ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| Float Float::valueOf( float value ) { |
| return Float( value ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| Float Float::valueOf( const std::string& value ) |
| throw ( exceptions::NumberFormatException ) { |
| |
| return valueOf( parseFloat( value ) ); |
| } |