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|
-----------------------------------------------------------------------------
--
-- Cmm utilities.
--
-- (c) The University of Glasgow 2004-2006
--
-----------------------------------------------------------------------------
module CmmUtils(
primRepCmmType, primRepForeignHint,
typeCmmType, typeForeignHint,
isTrivialCmmExpr, hasNoGlobalRegs,
cmmRegOff, cmmLabelOff, cmmOffset, cmmOffsetLit, cmmIndex,
cmmOffsetExpr, cmmIndexExpr, cmmLoadIndex,
mkIntCLit, zeroCLit,
mkLblExpr,
) where
#include "HsVersions.h"
import TyCon ( PrimRep(..) )
import Type ( Type, typePrimRep )
import CLabel
import CmmDecl
import CmmExpr
import Outputable
---------------------------------------------------
--
-- CmmTypes
--
---------------------------------------------------
primRepCmmType :: PrimRep -> CmmType
primRepCmmType VoidRep = panic "primRepCmmType:VoidRep"
primRepCmmType PtrRep = gcWord
primRepCmmType IntRep = bWord
primRepCmmType WordRep = bWord
primRepCmmType Int64Rep = b64
primRepCmmType Word64Rep = b64
primRepCmmType AddrRep = bWord
primRepCmmType FloatRep = f32
primRepCmmType DoubleRep = f64
typeCmmType :: Type -> CmmType
typeCmmType ty = primRepCmmType (typePrimRep ty)
primRepForeignHint :: PrimRep -> ForeignHint
primRepForeignHint VoidRep = panic "primRepForeignHint:VoidRep"
primRepForeignHint PtrRep = AddrHint
primRepForeignHint IntRep = SignedHint
primRepForeignHint WordRep = NoHint
primRepForeignHint Int64Rep = SignedHint
primRepForeignHint Word64Rep = NoHint
primRepForeignHint AddrRep = AddrHint -- NB! AddrHint, but NonPtrArg
primRepForeignHint FloatRep = NoHint
primRepForeignHint DoubleRep = NoHint
typeForeignHint :: Type -> ForeignHint
typeForeignHint = primRepForeignHint . typePrimRep
---------------------------------------------------
--
-- CmmExpr
--
---------------------------------------------------
isTrivialCmmExpr :: CmmExpr -> Bool
isTrivialCmmExpr (CmmLoad _ _) = False
isTrivialCmmExpr (CmmMachOp _ _) = False
isTrivialCmmExpr (CmmLit _) = True
isTrivialCmmExpr (CmmReg _) = True
isTrivialCmmExpr (CmmRegOff _ _) = True
isTrivialCmmExpr (CmmStackSlot _ _) = panic "isTrivialCmmExpr CmmStackSlot"
hasNoGlobalRegs :: CmmExpr -> Bool
hasNoGlobalRegs (CmmLoad e _) = hasNoGlobalRegs e
hasNoGlobalRegs (CmmMachOp _ es) = all hasNoGlobalRegs es
hasNoGlobalRegs (CmmLit _) = True
hasNoGlobalRegs (CmmReg (CmmLocal _)) = True
hasNoGlobalRegs (CmmRegOff (CmmLocal _) _) = True
hasNoGlobalRegs _ = False
---------------------------------------------------
--
-- Expr Construction helpers
--
---------------------------------------------------
cmmOffsetExpr :: CmmExpr -> CmmExpr -> CmmExpr
-- assumes base and offset have the same CmmType
cmmOffsetExpr e (CmmLit (CmmInt n _)) = cmmOffset e (fromInteger n)
cmmOffsetExpr e byte_off = CmmMachOp (MO_Add (cmmExprWidth e)) [e, byte_off]
-- NB. Do *not* inspect the value of the offset in these smart constructors!!!
-- because the offset is sometimes involved in a loop in the code generator
-- (we don't know the real Hp offset until we've generated code for the entire
-- basic block, for example). So we cannot eliminate zero offsets at this
-- stage; they're eliminated later instead (either during printing or
-- a later optimisation step on Cmm).
--
cmmOffset :: CmmExpr -> Int -> CmmExpr
cmmOffset e 0 = e
cmmOffset (CmmReg reg) byte_off = cmmRegOff reg byte_off
cmmOffset (CmmRegOff reg m) byte_off = cmmRegOff reg (m+byte_off)
cmmOffset (CmmLit lit) byte_off = CmmLit (cmmOffsetLit lit byte_off)
cmmOffset (CmmMachOp (MO_Add rep) [expr, CmmLit (CmmInt byte_off1 _rep)]) byte_off2
= CmmMachOp (MO_Add rep)
[expr, CmmLit (CmmInt (byte_off1 + toInteger byte_off2) rep)]
cmmOffset expr byte_off
= CmmMachOp (MO_Add width) [expr, CmmLit (CmmInt (toInteger byte_off) width)]
where
width = cmmExprWidth expr
-- Smart constructor for CmmRegOff. Same caveats as cmmOffset above.
cmmRegOff :: CmmReg -> Int -> CmmExpr
cmmRegOff reg byte_off = CmmRegOff reg byte_off
cmmOffsetLit :: CmmLit -> Int -> CmmLit
cmmOffsetLit (CmmLabel l) byte_off = cmmLabelOff l byte_off
cmmOffsetLit (CmmLabelOff l m) byte_off = cmmLabelOff l (m+byte_off)
cmmOffsetLit (CmmInt m rep) byte_off = CmmInt (m + fromIntegral byte_off) rep
cmmOffsetLit _ byte_off = pprPanic "cmmOffsetLit" (ppr byte_off)
cmmLabelOff :: CLabel -> Int -> CmmLit
-- Smart constructor for CmmLabelOff
cmmLabelOff lbl 0 = CmmLabel lbl
cmmLabelOff lbl byte_off = CmmLabelOff lbl byte_off
-- | Useful for creating an index into an array, with a staticaly known offset.
-- The type is the element type; used for making the multiplier
cmmIndex :: Width -- Width w
-> CmmExpr -- Address of vector of items of width w
-> Int -- Which element of the vector (0 based)
-> CmmExpr -- Address of i'th element
cmmIndex width base idx = cmmOffset base (idx * widthInBytes width)
-- | Useful for creating an index into an array, with an unknown offset.
cmmIndexExpr :: Width -- Width w
-> CmmExpr -- Address of vector of items of width w
-> CmmExpr -- Which element of the vector (0 based)
-> CmmExpr -- Address of i'th element
cmmIndexExpr width base (CmmLit (CmmInt n _)) = cmmIndex width base (fromInteger n)
cmmIndexExpr width base idx =
cmmOffsetExpr base byte_off
where
idx_w = cmmExprWidth idx
byte_off = CmmMachOp (MO_Shl idx_w) [idx, CmmLit (mkIntCLit (widthInLog width))]
cmmLoadIndex :: CmmType -> CmmExpr -> Int -> CmmExpr
cmmLoadIndex ty expr ix = CmmLoad (cmmIndex (typeWidth ty) expr ix) ty
---------------------------------------------------
--
-- Literal construction functions
--
---------------------------------------------------
mkIntCLit :: Int -> CmmLit
mkIntCLit i = CmmInt (toInteger i) wordWidth
zeroCLit :: CmmLit
zeroCLit = CmmInt 0 wordWidth
mkLblExpr :: CLabel -> CmmExpr
mkLblExpr lbl = CmmLit (CmmLabel lbl)
|
