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Provide Double and Float bit conversion functions as extensions in JS and Common

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Instance extension: Double/Float.toBits/toRawBits
Companion extension: Double/Float.Companion.fromBits

#KT-18264 Fixed
This commit is contained in:
Ilya Gorbunov
2017-08-31 07:05:35 +03:00
parent 044ccf1532
commit 132f2f88c2
6 changed files with 184 additions and 13 deletions
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libraries/stdlib/test/numbers/NumbersJVMTest.kt
-12
View File
@@ -41,18 +41,6 @@ class NumbersJVMTest {
assertEquals(java.lang.Float.NEGATIVE_INFINITY, Float.NEGATIVE_INFINITY)
}
@Test fun doubleToBits() {
assertEquals(0x400921fb54442d18L, kotlin.math.PI.toBits())
assertEquals(kotlin.math.PI, Double.fromBits(0x400921fb54442d18L))
for (value in listOf(Double.NEGATIVE_INFINITY, -Double.MAX_VALUE, -1.0, -Double.MIN_VALUE, -0.0, 0.0, Double.POSITIVE_INFINITY, Double.MAX_VALUE, 1.0, Double.MIN_VALUE)) {
assertEquals(value, Double.fromBits(value.toBits()))
assertEquals(value, Double.fromBits(value.toRawBits()))
}
assertTrue(Double.NaN.toBits().let(Double.Companion::fromBits).isNaN())
assertTrue(Double.NaN.toRawBits().let { Double.fromBits(it) }.isNaN())
}
@Test fun floatToBits() {
val PI_F = kotlin.math.PI.toFloat()
assertEquals(0x40490fdb, PI_F.toBits())
libraries/stdlib/test/numbers/NumbersTest.kt
+49
View File
@@ -120,4 +120,53 @@ class NumbersTest {
assertEquals(!isNaN && !isInfinite, value.isFinite())
}
@Test fun doubleToBits() {
assertEquals(0x400921fb54442d18L, kotlin.math.PI.toBits())
assertEquals(0x400921fb54442d18L, kotlin.math.PI.toRawBits())
assertEquals(kotlin.math.PI, Double.fromBits(0x400921fb54442d18L))
for (value in listOf(Double.NEGATIVE_INFINITY, -Double.MAX_VALUE, -1.0, -Double.MIN_VALUE, -0.0, 0.0, Double.POSITIVE_INFINITY, Double.MAX_VALUE, 1.0, Double.MIN_VALUE)) {
assertEquals(value, Double.fromBits(value.toBits()))
assertEquals(value, Double.fromBits(value.toRawBits()))
}
assertTrue(Double.NaN.toBits().let(Double.Companion::fromBits).isNaN())
assertTrue(Double.NaN.toRawBits().let { Double.fromBits(it) }.isNaN())
assertEquals(0x7FF00000L shl 32, Double.POSITIVE_INFINITY.toBits())
assertEquals(0xFFF00000L shl 32, Double.NEGATIVE_INFINITY.toBits())
assertEquals(0x7FF80000_00000000L, Double.NaN.toBits())
assertEquals(0x7FF80000_00000000L, Double.NaN.toRawBits())
val bitsNaN = Double.NaN.toBits()
for (bitsDenormNaN in listOf(0xFFF80000L shl 32, bitsNaN or 1)) {
assertTrue(Double.fromBits(bitsDenormNaN).isNaN(), "expected $bitsDenormNaN represent NaN")
assertEquals(bitsNaN, Double.fromBits(bitsDenormNaN).toBits())
}
}
@Test fun floatToBits() {
val PI_F = kotlin.math.PI.toFloat()
assertEquals(0x40490fdb, PI_F.toBits())
assertAlmostEquals(PI_F, Float.fromBits(0x40490fdb)) // PI_F is actually Double in JS
// -Float.MAX_VALUE, Float.MAX_VALUE, -Float.MIN_VALUE, Float.MIN_VALUE: overflow or underflow
for (value in listOf(Float.NEGATIVE_INFINITY, -1.0F, -0.0F, 0.0F, Float.POSITIVE_INFINITY, 1.0F)) {
assertEquals(value, Float.fromBits(value.toBits()))
assertEquals(value, Float.fromBits(value.toRawBits()))
}
assertTrue(Float.NaN.toBits().let(Float.Companion::fromBits).isNaN())
assertTrue(Float.NaN.toRawBits().let { Float.fromBits(it) }.isNaN())
assertEquals(0x7fc00000, Float.NaN.toBits())
assertEquals(0x7fc00000, Float.NaN.toRawBits())
val bitsNaN = Float.NaN.toBits()
for (bitsDenormNaN in listOf(0xFFFC0000.toInt(), bitsNaN or 1)) {
assertTrue(Float.fromBits(bitsDenormNaN).isNaN(), "expected $bitsDenormNaN represent NaN")
assertEquals(bitsNaN, Float.fromBits(bitsDenormNaN).toBits())
}
}
}