Comments (5)
ocramz
commented on June 4, 2024
@Shimuuar I am finding some packages that provide long double and arbitrary-precision operations:
- https://hackage.haskell.org/package/long-double (FFI)
- https://hackage.haskell.org/package/numbers-3000.2.0.2/docs/Data-Number-BigFloat.html
numbershas a BigFloat module (native) - https://hackage.haskell.org/package/haskell-mpfr (FFI, maybe bitrotted)
- https://hackage.haskell.org/package/hmpfr (FFI, recently updated)
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ocramz
commented on June 4, 2024
there's a long-standing GHC ticket to add CLDouble support : https://gitlab.haskell.org/ghc/ghc/issues/3353
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Shimuuar
commented on June 4, 2024
DoubleDouble (and triple double) is different approach. It's software emulation of something similar to quad precision.
- Long double (80-bit) has 63-bit mantissa DoubleDouble has 2x (3x) of Double — 106 bit (162 bit). On other hand it doesn't have hardware support
- Unlike arbitrary precision it has fixed size 128 (192) bit and thus could be easily unboxed/
Kahan's compensated summation is special case of this approach. I'm only aware of Julia's implementation of this algorithm
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ocramz
commented on June 4, 2024
@Shimuuar is this something you know how to implement? In case, would you like to do it?
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Shimuuar
commented on June 4, 2024
I have stack of papers on the subject, there's open source Julia implementation and no time to do anything :(
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