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Title
# random
e

ephemient

02/03/2023, 1:35 PM
I just debugged a test failure down to different results on different JVMs:
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import kotlin.math.*
sin(85.05112877980658 * PI / 180)
0.9962720762207499
(
Double.fromBits(0x3fefe175fa29280f)
) with Java 11 and Java 17 on Linux x86-64 as well as Java 11 on Apple Silicon •
0.99627207622075
(
Double.fromBits(0x3fefe175fa292810)
) with Java 17 on Apple Silicon
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👍 2
no, I'm not testing for equality, but I am testing that certain points remain in bounds after https://en.wikipedia.org/wiki/Web_Mercator_projection, and this one bit just happens to cause some other arithmetic to go wrong
anyhow, I ended up rewriting it in a more numerically-stable fashion, but it would have been convenient if there were some way to use
java.lang.StrictMath
instead of
java.lang.Math
from `kotlin.math.*`…
speaking of which. have there been any proposals to allow for hexadecimal floating point literals in Kotlin like in several other languages? it would be clearer to talk about
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0x1.fe175fa29280fp-1
0x1.fe175fa292810p-1
than the raw IEEE 754 bit representation
p

Paul Griffith

02/06/2023, 6:29 PM
looks like fractional hex literals were deliberately dropped (a while back) https://youtrack.jetbrains.com/issue/KT-4528/Lexer-tries-to-read-a-fractional-hex-literal
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