module GHC.CmmToAsm.SPARC.Imm (
        -- immediate values
        Imm(..),
        strImmLit,
        litToImm
)

where

import GHC.Prelude

import GHC.Cmm
import GHC.Cmm.CLabel

import GHC.Utils.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 :: String -> Imm
strImmLit String
s = SDoc -> Imm
ImmLit (String -> SDoc
text String
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 :: CmmLit -> Imm
litToImm CmmLit
lit
 = case CmmLit
lit of
        CmmInt Integer
i Width
w              -> Integer -> Imm
ImmInteger (Width -> Integer -> Integer
narrowS Width
w Integer
i)
        CmmFloat Rational
f Width
W32          -> Rational -> Imm
ImmFloat Rational
f
        CmmFloat Rational
f Width
W64          -> Rational -> Imm
ImmDouble Rational
f
        CmmLabel CLabel
l              -> CLabel -> Imm
ImmCLbl CLabel
l
        CmmLabelOff CLabel
l Int
off       -> CLabel -> Int -> Imm
ImmIndex CLabel
l Int
off

        CmmLabelDiffOff CLabel
l1 CLabel
l2 Int
off Width
_
         -> Imm -> Imm -> Imm
ImmConstantSum
                (Imm -> Imm -> Imm
ImmConstantDiff (CLabel -> Imm
ImmCLbl CLabel
l1) (CLabel -> Imm
ImmCLbl CLabel
l2))
                (Int -> Imm
ImmInt Int
off)

        CmmLit
_               -> String -> Imm
forall a. String -> a
panic String
"SPARC.Regs.litToImm: no match"