+mkMachInt, mkMachWord, mkMachInt64, mkMachWord64 :: Integer -> Literal
+
+mkMachInt x = -- ASSERT2( inIntRange x, integer x )
+ -- Not true: you can write out of range Int# literals
+ -- For example, one can write (intToWord# 0xffff0000) to
+ -- get a particular Word bit-pattern, and there's no other
+ -- convenient way to write such literals, which is why we allow it.
+ MachInt x
+mkMachWord x = -- ASSERT2( inWordRange x, integer x )
+ MachWord x
+mkMachInt64 x = MachInt64 x
+mkMachWord64 x = MachWord64 x
+
+inIntRange, inWordRange :: Integer -> Bool
+inIntRange x = x >= tARGET_MIN_INT && x <= tARGET_MAX_INT
+inWordRange x = x >= 0 && x <= tARGET_MAX_WORD
+
+inCharRange :: Int -> Bool
+inCharRange c = c >= 0 && c <= tARGET_MAX_CHAR
+
+isZeroLit :: Literal -> Bool
+isZeroLit (MachInt 0) = True
+isZeroLit (MachInt64 0) = True
+isZeroLit (MachWord 0) = True
+isZeroLit (MachWord64 0) = True
+isZeroLit (MachFloat 0) = True
+isZeroLit (MachDouble 0) = True
+isZeroLit other = False
+\end{code}
+
+ Coercions
+ ~~~~~~~~~
+\begin{code}
+word2IntLit, int2WordLit,
+ narrow8IntLit, narrow16IntLit, narrow32IntLit,
+ narrow8WordLit, narrow16WordLit, narrow32WordLit,
+ char2IntLit, int2CharLit,
+ float2IntLit, int2FloatLit, double2IntLit, int2DoubleLit,
+ float2DoubleLit, double2FloatLit
+ :: Literal -> Literal
+
+word2IntLit (MachWord w)
+ | w > tARGET_MAX_INT = MachInt (w - tARGET_MAX_WORD - 1)
+ | otherwise = MachInt w
+
+int2WordLit (MachInt i)
+ | i < 0 = MachWord (1 + tARGET_MAX_WORD + i) -- (-1) ---> tARGET_MAX_WORD
+ | otherwise = MachWord i
+
+narrow8IntLit (MachInt i) = MachInt (toInteger (fromInteger i :: Int8))
+narrow16IntLit (MachInt i) = MachInt (toInteger (fromInteger i :: Int16))
+narrow32IntLit (MachInt i) = MachInt (toInteger (fromInteger i :: Int32))
+narrow8WordLit (MachWord w) = MachWord (toInteger (fromInteger w :: Word8))
+narrow16WordLit (MachWord w) = MachWord (toInteger (fromInteger w :: Word16))
+narrow32WordLit (MachWord w) = MachWord (toInteger (fromInteger w :: Word32))
+
+char2IntLit (MachChar c) = MachInt (toInteger c)
+int2CharLit (MachInt i) = MachChar (fromInteger i)
+
+float2IntLit (MachFloat f) = MachInt (truncate f)
+int2FloatLit (MachInt i) = MachFloat (fromInteger i)
+
+double2IntLit (MachDouble f) = MachInt (truncate f)
+int2DoubleLit (MachInt i) = MachDouble (fromInteger i)
+
+float2DoubleLit (MachFloat f) = MachDouble f
+double2FloatLit (MachDouble d) = MachFloat d
+
+nullAddrLit :: Literal
+nullAddrLit = MachAddr 0
+\end{code}