Unique.hs

{-# LANGUAGE CPP #-}

{- Work around #23537

On 32 bit systems, GHC's codegen around 64 bit numbers is not quite
complete. This led to panics mentioning missing cases in iselExpr64.
Now that GHC uses Word64 for its uniques, these panics have started
popping up whenever a unique is compared to many other uniques in one
function. As a workaround we use these two functions which are not
inlined on 32 bit systems, thus preventing the panics.
-}

module GHC.Utils.Unique (sameUnique, anyOfUnique) where

#include "MachDeps.h"

import GHC.Prelude.Basic (Bool, Eq((==)), Foldable(elem))
import GHC.Types.Unique (Unique, Uniquable (getUnique))


#if WORD_SIZE_IN_BITS == 32
{-# NOINLINE sameUnique #-}
#else
{-# INLINE sameUnique #-}
#endif
sameUnique :: Uniquable a => a -> a -> Bool
sameUnique x y = getUnique x == getUnique y

#if WORD_SIZE_IN_BITS == 32
{-# NOINLINE anyOfUnique #-}
#else
{-# INLINE anyOfUnique #-}
#endif
anyOfUnique :: Uniquable a => a -> [Unique] -> Bool
anyOfUnique tc xs = getUnique tc `elem` xs