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stdlib: Implement float/double <-> bits conversion

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This commit is contained in:
Ilya Matveev
2017-11-24 17:04:17 +07:00
committed by ilmat192
parent a033dbf131
commit 2227c6c522
2 changed files with 72 additions and 0 deletions
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runtime/src/main/cpp/Operator.cpp
+18
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@@ -386,6 +386,15 @@ KInt Kotlin_Float_bits (KFloat a) {
return alias.i;
}
KFloat Kotlin_Float_fromBits (KInt a) {
union {
KFloat f;
KInt i;
} alias;
alias.i = a;
return alias.f;
}
KBoolean Kotlin_Float_isNaN (KFloat a) { return isnan(a); }
KBoolean Kotlin_Float_isInfinite (KFloat a) { return isinf(a); }
KBoolean Kotlin_Float_isFinite (KFloat a) { return isfinite(a); }
@@ -455,6 +464,15 @@ KLong Kotlin_Double_bits (KDouble a) {
return alias.l;
}
KDouble Kotlin_Double_fromBits (KLong a) {
union {
KDouble d;
KLong l;
} alias;
alias.l = a;
return alias.d;
}
KBoolean Kotlin_Double_isNaN (KDouble a) { return isnan(a); }
KBoolean Kotlin_Double_isInfinite (KDouble a) { return isinf(a); }
KBoolean Kotlin_Double_isFinite (KDouble a) { return isfinite(a); }
runtime/src/main/kotlin/kotlin/Numbers.kt
+54
View File
@@ -53,3 +53,57 @@ external public fun Double.isFinite(): Boolean
*/
@SymbolName("Kotlin_Float_isFinite")
external public fun Float.isFinite(): Boolean
/**
* Returns a bit representation of the specified floating-point value as [Long]
* according to the IEEE 754 floating-point "double format" bit layout.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Double.toBits(): Long = if (isNaN()) Double.NaN.toRawBits() else toRawBits()
/**
* Returns a bit representation of the specified floating-point value as [Long]
* according to the IEEE 754 floating-point "double format" bit layout,
* preserving `NaN` values exact layout.
*/
@SinceKotlin("1.2")
public fun Double.toRawBits(): Long = bits()
/**
* Returns the [Double] value corresponding to a given bit representation.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Double.Companion.fromBits(bits: Long): Double = kotlin.fromBits(bits)
@PublishedApi
@SymbolName("Kotlin_Double_fromBits")
external internal fun fromBits(bits: Long): Double
/**
* Returns a bit representation of the specified floating-point value as [Int]
* according to the IEEE 754 floating-point "single format" bit layout.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Float.toBits(): Int = if (isNaN()) Float.NaN.toRawBits() else toRawBits()
/**
* Returns a bit representation of the specified floating-point value as [Int]
* according to the IEEE 754 floating-point "single format" bit layout,
* preserving `NaN` values exact layout.
*/
@SinceKotlin("1.2")
public fun Float.toRawBits(): Int = bits()
/**
* Returns the [Float] value corresponding to a given bit representation.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Float.Companion.fromBits(bits: Int): Float = kotlin.fromBits(bits)
@PublishedApi
@SymbolName("Kotlin_Float_fromBits")
external internal fun fromBits(bits: Int): Float