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fix float generation
This commit is contained in:
Irmen de Jong
parent
8368633ed2
commit
bc558019ee
2
.gitignore
vendored
2
.gitignore
vendored
@ -19,4 +19,4 @@ parsetab.py
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!/il65/lib/*
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!/il65/lib/*
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.pytest_cache/
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.pytest_cache/
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docs/build
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docs/build
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il65/out
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@ -2,8 +2,9 @@ package il65.compiler
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import il65.ast.INameScope
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import il65.ast.INameScope
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import il65.ast.Module
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import il65.ast.Module
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import java.nio.ByteBuffer
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import kotlin.experimental.and
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import java.nio.ByteOrder
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import kotlin.math.absoluteValue
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import kotlin.math.pow
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import kotlin.system.exitProcess
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import kotlin.system.exitProcess
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@ -28,86 +29,61 @@ fun Number.toHex(): String {
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}
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}
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fun Double.frexp(): Pair<Double, Int> {
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data class Mflpt5(val b0: Short, val b1: Short, val b2: Short, val b3: Short, val b4: Short){
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var exponent: Int = Math.getExponent(this)
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val mantissa: Double
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when (exponent) {
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companion object {
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1024
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val zero = Mflpt5(0, 0,0,0,0)
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-> {
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fun fromNumber(num: Number): Mflpt5 {
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// Inf or NaN
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// see https://en.wikipedia.org/wiki/Microsoft_Binary_Format
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mantissa = this
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// and https://sourceforge.net/p/acme-crossass/code-0/62/tree/trunk/ACME_Lib/cbm/mflpt.a
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exponent = 0
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// and https://en.wikipedia.org/wiki/IEEE_754-1985
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}
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-1023 -> if (this == 0.0) {
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val flt = num.toDouble()
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// -0.0 or 0.0
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if(flt < FLOAT_MAX_NEGATIVE || flt > FLOAT_MAX_POSITIVE)
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mantissa = this
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throw CompilerException("floating point number out of 5-byte mflpt range: $this")
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exponent = 0
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if(flt==0.0)
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} else {
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return zero
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exponent = Math.getExponent(this * 0x10000000000000) - 51 // that is 0x1p52 == 2**52
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mantissa = Math.scalb(this, -exponent)
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}
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else -> {
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val sign = if(flt<0.0) 0x80L else 0x00L
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exponent++
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var exponent = 128 + 32 // 128 is cbm's bias, 32 is this algo's bias
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mantissa = Math.scalb(this, -exponent)
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var mantissa = flt.absoluteValue
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}
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}
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return Pair(mantissa, exponent)
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}
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fun Number.toMflpt5(): ShortArray {
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// if mantissa is too large, shift right and adjust exponent
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// algorithm here https://sourceforge.net/p/acme-crossass/code-0/62/tree/trunk/ACME_Lib/cbm/mflpt.a
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while(mantissa >= 0x100000000) {
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mantissa /= 2.0
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// @todo fix this
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exponent ++
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}
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var flt = this.toDouble()
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// if mantissa is too small, shift left and adjust exponent
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if(flt < FLOAT_MAX_NEGATIVE || flt > FLOAT_MAX_POSITIVE)
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while(mantissa < 0x80000000) {
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throw CompilerException("floating point number out of 5-byte mflpt range: $this")
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mantissa *= 2.0
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if(flt==0.0)
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exponent --
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return shortArrayOf(0, 0, 0, 0, 0)
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val sign: Long =
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when {
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flt < 0.0 -> {
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flt = -flt
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0x80000000L
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}
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else -> 0x00000000L
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}
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}
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var (mant, exp) = flt.frexp()
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return when {
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exp += 128
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exponent<0 -> zero // underflow, use zero instead
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if(exp < 1) {
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exponent>255 -> throw CompilerException("floating point overflow: $this")
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// underflow, use zero instead
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exponent==0 -> zero
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return shortArrayOf(0, 0, 0 ,0 ,0)
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else -> {
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val mant_long = mantissa.toLong()
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Mflpt5(
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exponent.toShort(),
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(mant_long.and(0x7f000000L) ushr 24).or(sign).toShort(),
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(mant_long.and(0x00ff0000L) ushr 16).toShort(),
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(mant_long.and(0x0000ff00L) ushr 8).toShort(),
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(mant_long.and(0x000000ffL)).toShort())
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}
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}
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}
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}
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}
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if(exp > 255) {
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throw CompilerException("floating point number out of 5-byte mflpt range: $this")
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fun toDouble(): Double {
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if(this == zero) return 0.0
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val exp = b0 - 128
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val sign = (b1.and(0x80)) > 0
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val number = 0x80000000L.or(b1.toLong() shl 24).or(b2.toLong() shl 16).or(b3.toLong() shl 8).or(b4.toLong())
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val result = number.toDouble() * (2.0).pow(exp) / 0x100000000
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return if(sign) -result else result
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}
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}
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val mflpt = sign.or((mant * 0x100000000L).toLong()).and(0x7fffffffL)
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val result = ShortArray(5)
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result[0] = exp.toShort()
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result[1] = (mflpt and -0x1000000 shr 24).toShort()
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result[2] = (mflpt and 0x00FF0000 shr 16).toShort()
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result[3] = (mflpt and 0x0000FF00 shr 8).toShort()
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result[4] = (mflpt and 0x000000FF shr 0).toShort()
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return result
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/*
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mant, exp = math.frexp(number)
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exp += 128
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if exp < 1:
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# underflow, use zero instead
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return bytearray([0, 0, 0, 0, 0])
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if exp > 255:
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raise OverflowError("floating point number out of 5-byte mflpt range", number)
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mant = sign | int(mant * 0x100000000) & 0x7fffffff
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return bytearray([exp]) + int.to_bytes(mant, 4, "big")
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*/
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}
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}
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@ -76,7 +76,7 @@ fun builtin_abs(args: List<IExpression>, position: Position?, namespace:INameSco
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throw SyntaxError("built-in function abs requires one numeric argument", position)
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throw SyntaxError("built-in function abs requires one numeric argument", position)
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val float = args[0].constValue(namespace)?.asFloat()
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val float = args[0].constValue(namespace)?.asFloat()
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if(float!=null)
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if(float!=null)
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return IntOrFloatLiteral(Math.abs(float), args[0].position)
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return intOrFloatLiteral(Math.abs(float), args[0].position)
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else
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else
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throw SyntaxError("built-in function abs requires floating point value as argument", position)
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throw SyntaxError("built-in function abs requires floating point value as argument", position)
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}
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}
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@ -88,7 +88,7 @@ fun builtin_max(args: List<IExpression>, position: Position?, namespace:INameSco
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if(constants.contains(null))
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if(constants.contains(null))
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throw SyntaxError("not all arguments to max are a constant value", position)
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throw SyntaxError("not all arguments to max are a constant value", position)
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val result = constants.map { it?.asFloat()!! }.max()
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val result = constants.map { it?.asFloat()!! }.max()
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return IntOrFloatLiteral(result!!, args[0].position)
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return intOrFloatLiteral(result!!, args[0].position)
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}
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}
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fun builtin_min(args: List<IExpression>, position: Position?, namespace:INameScope): LiteralValue {
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fun builtin_min(args: List<IExpression>, position: Position?, namespace:INameScope): LiteralValue {
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@ -98,11 +98,11 @@ fun builtin_min(args: List<IExpression>, position: Position?, namespace:INameSco
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if(constants.contains(null))
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if(constants.contains(null))
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throw SyntaxError("not all arguments to min are a constant value", position)
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throw SyntaxError("not all arguments to min are a constant value", position)
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val result = constants.map { it?.asFloat()!! }.min()
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val result = constants.map { it?.asFloat()!! }.min()
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return IntOrFloatLiteral(result!!, args[0].position)
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return intOrFloatLiteral(result!!, args[0].position)
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}
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}
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private fun IntOrFloatLiteral(value: Double, position: Position?): LiteralValue {
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private fun intOrFloatLiteral(value: Double, position: Position?): LiteralValue {
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val intresult = value.toInt()
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val intresult = value.toInt()
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val result = if(value-intresult==0.0)
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val result = if(value-intresult==0.0)
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LiteralValue(intvalue = intresult)
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LiteralValue(intvalue = intresult)
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@ -5,6 +5,7 @@ import il65.ast.VarDecl
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import il65.ast.VarDeclType
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import il65.ast.VarDeclType
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import il65.compiler.*
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import il65.compiler.*
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import org.hamcrest.MatcherAssert.assertThat
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import org.hamcrest.MatcherAssert.assertThat
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import org.hamcrest.Matchers.closeTo
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import org.hamcrest.Matchers.equalTo
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import org.hamcrest.Matchers.equalTo
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import org.junit.jupiter.api.Test
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import org.junit.jupiter.api.Test
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import org.junit.jupiter.api.TestInstance
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import org.junit.jupiter.api.TestInstance
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@ -36,42 +37,70 @@ class TestCompiler {
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@Test
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@Test
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fun testFloatToMflpt5() {
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fun testFloatToMflpt5() {
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assertThat((0).toMflpt5(), equalTo(shortArrayOf(0x00, 0x00, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(0), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
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assertThat((3.141592653).toMflpt5(), equalTo(shortArrayOf(0x82, 0x49, 0x0F, 0xDA, 0xA1)))
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assertThat(Mflpt5.fromNumber(3.141592653), equalTo(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA1)))
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assertThat((3.141592653589793).toMflpt5(), equalTo(shortArrayOf(0x82, 0x49, 0x0F, 0xDA, 0xA2)))
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assertThat(Mflpt5.fromNumber(3.141592653589793), equalTo(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA2)))
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assertThat((-32768).toMflpt5(), equalTo(shortArrayOf(0x90, 0x80, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(32768), equalTo(Mflpt5(0x90, 0x00, 0x00, 0x00, 0x00)))
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assertThat((1).toMflpt5(), equalTo(shortArrayOf(0x81, 0x00, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(-32768), equalTo(Mflpt5(0x90, 0x80, 0x00, 0x00, 0x00)))
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assertThat((0.7071067812).toMflpt5(), equalTo(shortArrayOf(0x80, 0x35, 0x04, 0xF3, 0x34)))
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assertThat(Mflpt5.fromNumber(1), equalTo(Mflpt5(0x81, 0x00, 0x00, 0x00, 0x00)))
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assertThat((0.7071067811865476).toMflpt5(), equalTo(shortArrayOf(0x80, 0x35, 0x04, 0xF3, 0x33)))
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assertThat(Mflpt5.fromNumber(0.7071067812), equalTo(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x34)))
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assertThat((1.4142135624).toMflpt5(), equalTo(shortArrayOf(0x81, 0x35, 0x04, 0xF3, 0x34)))
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assertThat(Mflpt5.fromNumber(0.7071067811865476), equalTo(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x33)))
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assertThat((1.4142135623730951).toMflpt5(), equalTo(shortArrayOf(0x81, 0x35, 0x04, 0xF3, 0x33)))
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assertThat(Mflpt5.fromNumber(1.4142135624), equalTo(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x34)))
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assertThat((-.5).toMflpt5(), equalTo(shortArrayOf(0x80, 0x80, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(1.4142135623730951), equalTo(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x33)))
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assertThat((0.69314718061).toMflpt5(), equalTo(shortArrayOf(0x80, 0x31, 0x72, 0x17, 0xF8)))
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assertThat(Mflpt5.fromNumber(-.5), equalTo(Mflpt5(0x80, 0x80, 0x00, 0x00, 0x00)))
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assertThat((0.6931471805599453).toMflpt5(), equalTo(shortArrayOf(0x80, 0x31, 0x72, 0x17, 0xF7)))
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assertThat(Mflpt5.fromNumber(0.69314718061), equalTo(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF8)))
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assertThat((10).toMflpt5(), equalTo(shortArrayOf(0x84, 0x20, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(0.6931471805599453), equalTo(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF7)))
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assertThat((1000000000).toMflpt5(), equalTo(shortArrayOf(0x9E, 0x6E, 0x6B, 0x28, 0x00)))
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assertThat(Mflpt5.fromNumber(10), equalTo(Mflpt5(0x84, 0x20, 0x00, 0x00, 0x00)))
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assertThat((.5).toMflpt5(), equalTo(shortArrayOf(0x80, 0x00, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(1000000000), equalTo(Mflpt5(0x9E, 0x6E, 0x6B, 0x28, 0x00)))
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assertThat((1.4426950408889634).toMflpt5(), equalTo(shortArrayOf(0x81, 0x38, 0xAA, 0x3B, 0x29)))
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assertThat(Mflpt5.fromNumber(.5), equalTo(Mflpt5(0x80, 0x00, 0x00, 0x00, 0x00)))
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assertThat((1.5707963267948966).toMflpt5(), equalTo(shortArrayOf(0x81, 0x49, 0x0F, 0xDA, 0xA2)))
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assertThat(Mflpt5.fromNumber(1.4426950408889634), equalTo(Mflpt5(0x81, 0x38, 0xAA, 0x3B, 0x29)))
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assertThat((6.283185307179586).toMflpt5(), equalTo(shortArrayOf(0x83, 0x49, 0x0F, 0xDA, 0xA2)))
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assertThat(Mflpt5.fromNumber(1.5707963267948966), equalTo(Mflpt5(0x81, 0x49, 0x0F, 0xDA, 0xA2)))
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assertThat((.25).toMflpt5(), equalTo(shortArrayOf(0x7F, 0x00, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(6.283185307179586), equalTo(Mflpt5(0x83, 0x49, 0x0F, 0xDA, 0xA2)))
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assertThat(Mflpt5.fromNumber(.25), equalTo(Mflpt5(0x7F, 0x00, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(123.45678e22), equalTo(Mflpt5(0xd1, 0x02, 0xb7, 0x06, 0xfb)))
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assertThat(Mflpt5.fromNumber(-123.45678e-22), equalTo(Mflpt5(0x3e, 0xe9, 0x34, 0x09, 0x1b)))
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}
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}
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@Test
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@Test
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fun testFloatRange() {
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fun testFloatRange() {
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assertThat(FLOAT_MAX_POSITIVE.toMflpt5(), equalTo(shortArrayOf(0xff, 0x7f, 0xff, 0xff, 0xff)))
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assertThat(Mflpt5.fromNumber(FLOAT_MAX_POSITIVE), equalTo(Mflpt5(0xff, 0x7f, 0xff, 0xff, 0xff)))
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assertThat(FLOAT_MAX_NEGATIVE.toMflpt5(), equalTo(shortArrayOf(0xff, 0xff, 0xff, 0xff, 0xff)))
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assertThat(Mflpt5.fromNumber(FLOAT_MAX_NEGATIVE), equalTo(Mflpt5(0xff, 0xff, 0xff, 0xff, 0xff)))
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assertThat((1.7e-38).toMflpt5(), equalTo(shortArrayOf(0x03, 0x39, 0x1d, 0x15, 0x63)))
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assertThat(Mflpt5.fromNumber(1.7e-38), equalTo(Mflpt5(0x03, 0x39, 0x1d, 0x15, 0x63)))
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assertThat((1.7e-39).toMflpt5(), equalTo(shortArrayOf(0x00, 0x00, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(1.7e-39), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
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assertThat((-1.7e-38).toMflpt5(), equalTo(shortArrayOf(0x03, 0xb9, 0x1d, 0x15, 0x63)))
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assertThat(Mflpt5.fromNumber(-1.7e-38), equalTo(Mflpt5(0x03, 0xb9, 0x1d, 0x15, 0x63)))
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assertThat((-1.7e-39).toMflpt5(), equalTo(shortArrayOf(0x00, 0x00, 0x00, 0x00, 0x00)))
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assertThat(Mflpt5.fromNumber(-1.7e-39), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
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assertFailsWith<CompilerException> { 1.7014118346e+38.toMflpt5() }
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assertFailsWith<CompilerException> { Mflpt5.fromNumber(1.7014118346e+38) }
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assertFailsWith<CompilerException> { (-1.7014118346e+38).toMflpt5() }
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assertFailsWith<CompilerException> { Mflpt5.fromNumber(-1.7014118346e+38) }
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assertFailsWith<CompilerException> { 1.7014118347e+38.toMflpt5() }
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assertFailsWith<CompilerException> { Mflpt5.fromNumber(1.7014118347e+38) }
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assertFailsWith<CompilerException> { (-1.7014118347e+38).toMflpt5() }
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assertFailsWith<CompilerException> { Mflpt5.fromNumber(-1.7014118347e+38) }
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}
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}
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// @todo test the other way round, mflpt-bytes -> float.
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@Test
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fun testMflpt5ToFloat() {
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val PRECISION=0.000000001
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assertThat(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(0.0))
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assertThat(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA1).toDouble(), closeTo(3.141592653, PRECISION))
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assertThat(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(3.141592653589793, PRECISION))
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assertThat(Mflpt5(0x90, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(32768.0))
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assertThat(Mflpt5(0x90, 0x80, 0x00, 0x00, 0x00).toDouble(), equalTo(-32768.0))
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assertThat(Mflpt5(0x81, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(1.0))
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assertThat(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x34).toDouble(), closeTo(0.7071067812, PRECISION))
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assertThat(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x33).toDouble(), closeTo(0.7071067811865476, PRECISION))
|
||||||
|
assertThat(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x34).toDouble(), closeTo(1.4142135624, PRECISION))
|
||||||
|
assertThat(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x33).toDouble(), closeTo(1.4142135623730951, PRECISION))
|
||||||
|
assertThat(Mflpt5(0x80, 0x80, 0x00, 0x00, 0x00).toDouble(), equalTo(-.5))
|
||||||
|
assertThat(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF8).toDouble(), closeTo(0.69314718061, PRECISION))
|
||||||
|
assertThat(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF7).toDouble(), closeTo(0.6931471805599453, PRECISION))
|
||||||
|
assertThat(Mflpt5(0x84, 0x20, 0x00, 0x00, 0x00).toDouble(), equalTo(10.0))
|
||||||
|
assertThat(Mflpt5(0x9E, 0x6E, 0x6B, 0x28, 0x00).toDouble(), equalTo(1000000000.0))
|
||||||
|
assertThat(Mflpt5(0x80, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(.5))
|
||||||
|
assertThat(Mflpt5(0x81, 0x38, 0xAA, 0x3B, 0x29).toDouble(), closeTo(1.4426950408889634, PRECISION))
|
||||||
|
assertThat(Mflpt5(0x81, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(1.5707963267948966, PRECISION))
|
||||||
|
assertThat(Mflpt5(0x83, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(6.283185307179586, PRECISION))
|
||||||
|
assertThat(Mflpt5(0x7F, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(.25))
|
||||||
|
assertThat(Mflpt5(0xd1, 0x02, 0xb7, 0x06, 0xfb).toDouble(), closeTo(123.45678e22, 1.0e15))
|
||||||
|
assertThat(Mflpt5(0x3e, 0xe9, 0x34, 0x09, 0x1b).toDouble(), closeTo(-123.45678e-22, PRECISION))
|
||||||
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user