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|
{-# OPTIONS_GHC -fno-warn-tabs #-}
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and
-- detab the module (please do the detabbing in a separate patch). See
-- http://ghc.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
-- for details
module SPARC.Imm (
-- immediate values
Imm(..),
strImmLit,
litToImm
)
where
import Cmm
import CLabel
import Outputable
-- | An immediate value.
-- Not all of these are directly representable by the machine.
-- Things like ImmLit are slurped out and put in a data segment instead.
--
data Imm
= ImmInt Int
-- Sigh.
| ImmInteger Integer
-- AbstractC Label (with baggage)
| ImmCLbl CLabel
-- Simple string
| ImmLit SDoc
| ImmIndex CLabel Int
| ImmFloat Rational
| ImmDouble Rational
| ImmConstantSum Imm Imm
| ImmConstantDiff Imm Imm
| LO Imm
| HI Imm
-- | Create a ImmLit containing this string.
strImmLit :: String -> Imm
strImmLit s = ImmLit (text s)
-- | Convert a CmmLit to an Imm.
-- Narrow to the width: a CmmInt might be out of
-- range, but we assume that ImmInteger only contains
-- in-range values. A signed value should be fine here.
--
litToImm :: CmmLit -> Imm
litToImm lit
= case lit of
CmmInt i w -> ImmInteger (narrowS w i)
CmmFloat f W32 -> ImmFloat f
CmmFloat f W64 -> ImmDouble f
CmmLabel l -> ImmCLbl l
CmmLabelOff l off -> ImmIndex l off
CmmLabelDiffOff l1 l2 off
-> ImmConstantSum
(ImmConstantDiff (ImmCLbl l1) (ImmCLbl l2))
(ImmInt off)
_ -> panic "SPARC.Regs.litToImm: no match"
|
