ghc panic using SIMD types with unboxed sums
{-# language MagicHash,UnboxedSums #-}
module Test where
import GHC.Prim
foo :: (# Int8X16# | () #) -> ()
foo _ = ()
building with -fllvm
yields:
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.4.2:
primRepSlot
No slot for VecRep
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/GHC/Utils/Panic.hs:182:37 in ghc:GHC.Utils.Panic
pprPanic, called at compiler/GHC/Types/RepType.hs:329:27 in ghc:GHC.Types.RepType
This appears to happen for all SIMD types.
Other combinations of SIMD types (eg in an unboxed tuple) are working fine.