CmmMachOp.hs 14.1 KB
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module CmmMachOp
    ( MachOp(..)
    , pprMachOp, isCommutableMachOp, isAssociativeMachOp
    , isComparisonMachOp, machOpResultType
    , machOpArgReps, maybeInvertComparison

    -- MachOp builders
    , mo_wordAdd, mo_wordSub, mo_wordEq, mo_wordNe,mo_wordMul, mo_wordSQuot
    , mo_wordSRem, mo_wordSNeg, mo_wordUQuot, mo_wordURem
    , mo_wordSGe, mo_wordSLe, mo_wordSGt, mo_wordSLt, mo_wordUGe
    , mo_wordULe, mo_wordUGt, mo_wordULt
    , mo_wordAnd, mo_wordOr, mo_wordXor, mo_wordNot, mo_wordShl, mo_wordSShr, mo_wordUShr
    , mo_u_8To32, mo_s_8To32, mo_u_16To32, mo_s_16To32
    , mo_u_8ToWord, mo_s_8ToWord, mo_u_16ToWord, mo_s_16ToWord, mo_u_32ToWord, mo_s_32ToWord
    , mo_32To8, mo_32To16, mo_WordTo8, mo_WordTo16, mo_WordTo32

    -- CallishMachOp
    , CallishMachOp(..)
    , pprCallishMachOp
   )
where

#include "HsVersions.h"

import CmmType
import Outputable

-----------------------------------------------------------------------------
--              MachOp
-----------------------------------------------------------------------------

{- |
Machine-level primops; ones which we can reasonably delegate to the
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native code generators to handle.
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Most operations are parameterised by the 'Width' that they operate on.
Some operations have separate signed and unsigned versions, and float
and integer versions.
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-}

data MachOp
  -- Integer operations (insensitive to signed/unsigned)
  = MO_Add Width
  | MO_Sub Width
  | MO_Eq  Width
  | MO_Ne  Width
  | MO_Mul Width                -- low word of multiply

  -- Signed multiply/divide
  | MO_S_MulMayOflo Width       -- nonzero if signed multiply overflows
  | MO_S_Quot Width             -- signed / (same semantics as IntQuotOp)
  | MO_S_Rem  Width             -- signed % (same semantics as IntRemOp)
  | MO_S_Neg  Width             -- unary -

  -- Unsigned multiply/divide
  | MO_U_MulMayOflo Width       -- nonzero if unsigned multiply overflows
  | MO_U_Quot Width             -- unsigned / (same semantics as WordQuotOp)
  | MO_U_Rem  Width             -- unsigned % (same semantics as WordRemOp)

  -- Signed comparisons
  | MO_S_Ge Width
  | MO_S_Le Width
  | MO_S_Gt Width
  | MO_S_Lt Width

  -- Unsigned comparisons
  | MO_U_Ge Width
  | MO_U_Le Width
  | MO_U_Gt Width
  | MO_U_Lt Width

  -- Floating point arithmetic
  | MO_F_Add  Width
  | MO_F_Sub  Width
  | MO_F_Neg  Width             -- unary -
  | MO_F_Mul  Width
  | MO_F_Quot Width

  -- Floating point comparison
  | MO_F_Eq Width
  | MO_F_Ne Width
  | MO_F_Ge Width
  | MO_F_Le Width
  | MO_F_Gt Width
  | MO_F_Lt Width

  -- Bitwise operations.  Not all of these may be supported
  -- at all sizes, and only integral Widths are valid.
  | MO_And   Width
  | MO_Or    Width
  | MO_Xor   Width
  | MO_Not   Width
  | MO_Shl   Width
  | MO_U_Shr Width      -- unsigned shift right
  | MO_S_Shr Width      -- signed shift right

  -- Conversions.  Some of these will be NOPs.
  -- Floating-point conversions use the signed variant.
  | MO_SF_Conv Width Width      -- Signed int -> Float
  | MO_FS_Conv Width Width      -- Float -> Signed int
  | MO_SS_Conv Width Width      -- Signed int -> Signed int
  | MO_UU_Conv Width Width      -- unsigned int -> unsigned int
  | MO_FF_Conv Width Width      -- Float -> Float
  deriving (Eq, Show)

pprMachOp :: MachOp -> SDoc
pprMachOp mo = text (show mo)



-- -----------------------------------------------------------------------------
-- Some common MachReps

-- A 'wordRep' is a machine word on the target architecture
-- Specifically, it is the size of an Int#, Word#, Addr#
-- and the unit of allocation on the stack and the heap
-- Any pointer is also guaranteed to be a wordRep.

mo_wordAdd, mo_wordSub, mo_wordEq, mo_wordNe,mo_wordMul, mo_wordSQuot
    , mo_wordSRem, mo_wordSNeg, mo_wordUQuot, mo_wordURem
    , mo_wordSGe, mo_wordSLe, mo_wordSGt, mo_wordSLt, mo_wordUGe
    , mo_wordULe, mo_wordUGt, mo_wordULt
    , mo_wordAnd, mo_wordOr, mo_wordXor, mo_wordNot, mo_wordShl, mo_wordSShr, mo_wordUShr
    , mo_u_8To32, mo_s_8To32, mo_u_16To32, mo_s_16To32
    , mo_u_8ToWord, mo_s_8ToWord, mo_u_16ToWord, mo_s_16ToWord, mo_u_32ToWord, mo_s_32ToWord
    , mo_32To8, mo_32To16, mo_WordTo8, mo_WordTo16, mo_WordTo32
    :: MachOp

mo_wordAdd      = MO_Add wordWidth
mo_wordSub      = MO_Sub wordWidth
mo_wordEq       = MO_Eq  wordWidth
mo_wordNe       = MO_Ne  wordWidth
mo_wordMul      = MO_Mul wordWidth
mo_wordSQuot    = MO_S_Quot wordWidth
mo_wordSRem     = MO_S_Rem wordWidth
mo_wordSNeg     = MO_S_Neg wordWidth
mo_wordUQuot    = MO_U_Quot wordWidth
mo_wordURem     = MO_U_Rem wordWidth

mo_wordSGe      = MO_S_Ge  wordWidth
mo_wordSLe      = MO_S_Le  wordWidth
mo_wordSGt      = MO_S_Gt  wordWidth
mo_wordSLt      = MO_S_Lt  wordWidth

mo_wordUGe      = MO_U_Ge  wordWidth
mo_wordULe      = MO_U_Le  wordWidth
mo_wordUGt      = MO_U_Gt  wordWidth
mo_wordULt      = MO_U_Lt  wordWidth

mo_wordAnd      = MO_And wordWidth
mo_wordOr       = MO_Or  wordWidth
mo_wordXor      = MO_Xor wordWidth
mo_wordNot      = MO_Not wordWidth
mo_wordShl      = MO_Shl wordWidth
mo_wordSShr     = MO_S_Shr wordWidth
mo_wordUShr     = MO_U_Shr wordWidth

mo_u_8To32      = MO_UU_Conv W8 W32
mo_s_8To32      = MO_SS_Conv W8 W32
mo_u_16To32     = MO_UU_Conv W16 W32
mo_s_16To32     = MO_SS_Conv W16 W32

mo_u_8ToWord    = MO_UU_Conv W8  wordWidth
mo_s_8ToWord    = MO_SS_Conv W8  wordWidth
mo_u_16ToWord   = MO_UU_Conv W16 wordWidth
mo_s_16ToWord   = MO_SS_Conv W16 wordWidth
mo_s_32ToWord   = MO_SS_Conv W32 wordWidth
mo_u_32ToWord   = MO_UU_Conv W32 wordWidth

mo_WordTo8      = MO_UU_Conv wordWidth W8
mo_WordTo16     = MO_UU_Conv wordWidth W16
mo_WordTo32     = MO_UU_Conv wordWidth W32

mo_32To8        = MO_UU_Conv W32 W8
mo_32To16       = MO_UU_Conv W32 W16


-- ----------------------------------------------------------------------------
-- isCommutableMachOp

{- |
Returns 'True' if the MachOp has commutable arguments.  This is used
in the platform-independent Cmm optimisations.

If in doubt, return 'False'.  This generates worse code on the
native routes, but is otherwise harmless.
-}
isCommutableMachOp :: MachOp -> Bool
isCommutableMachOp mop =
  case mop of
        MO_Add _                -> True
        MO_Eq _                 -> True
        MO_Ne _                 -> True
        MO_Mul _                -> True
        MO_S_MulMayOflo _       -> True
        MO_U_MulMayOflo _       -> True
        MO_And _                -> True
        MO_Or _                 -> True
        MO_Xor _                -> True
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        MO_F_Add _              -> True
        MO_F_Mul _              -> True
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        _other                  -> False

-- ----------------------------------------------------------------------------
-- isAssociativeMachOp

{- |
Returns 'True' if the MachOp is associative (i.e. @(x+y)+z == x+(y+z)@)
This is used in the platform-independent Cmm optimisations.

If in doubt, return 'False'.  This generates worse code on the
native routes, but is otherwise harmless.
-}
isAssociativeMachOp :: MachOp -> Bool
isAssociativeMachOp mop =
  case mop of
        MO_Add {} -> True       -- NB: does not include
        MO_Mul {} -> True --     floatint point!
        MO_And {} -> True
        MO_Or  {} -> True
        MO_Xor {} -> True
        _other    -> False

-- ----------------------------------------------------------------------------
-- isComparisonMachOp

{- |
Returns 'True' if the MachOp is a comparison.

If in doubt, return False.  This generates worse code on the
native routes, but is otherwise harmless.
-}
isComparisonMachOp :: MachOp -> Bool
isComparisonMachOp mop =
  case mop of
    MO_Eq   _  -> True
    MO_Ne   _  -> True
    MO_S_Ge _  -> True
    MO_S_Le _  -> True
    MO_S_Gt _  -> True
    MO_S_Lt _  -> True
    MO_U_Ge _  -> True
    MO_U_Le _  -> True
    MO_U_Gt _  -> True
    MO_U_Lt _  -> True
    MO_F_Eq {} -> True
    MO_F_Ne {} -> True
    MO_F_Ge {} -> True
    MO_F_Le {} -> True
    MO_F_Gt {} -> True
    MO_F_Lt {} -> True
    _other     -> False

-- -----------------------------------------------------------------------------
-- Inverting conditions

-- Sometimes it's useful to be able to invert the sense of a
-- condition.  Not all conditional tests are invertible: in
-- particular, floating point conditionals cannot be inverted, because
-- there exist floating-point values which return False for both senses
-- of a condition (eg. !(NaN > NaN) && !(NaN /<= NaN)).

maybeInvertComparison :: MachOp -> Maybe MachOp
maybeInvertComparison op
  = case op of  -- None of these Just cases include floating point
        MO_Eq r   -> Just (MO_Ne r)
        MO_Ne r   -> Just (MO_Eq r)
        MO_U_Lt r -> Just (MO_U_Ge r)
        MO_U_Gt r -> Just (MO_U_Le r)
        MO_U_Le r -> Just (MO_U_Gt r)
        MO_U_Ge r -> Just (MO_U_Lt r)
        MO_S_Lt r -> Just (MO_S_Ge r)
        MO_S_Gt r -> Just (MO_S_Le r)
        MO_S_Le r -> Just (MO_S_Gt r)
        MO_S_Ge r -> Just (MO_S_Lt r)
        _other    -> Nothing

-- ----------------------------------------------------------------------------
-- machOpResultType

{- |
Returns the MachRep of the result of a MachOp.
-}
machOpResultType :: MachOp -> [CmmType] -> CmmType
machOpResultType mop tys =
  case mop of
    MO_Add {}           -> ty1  -- Preserve GC-ptr-hood
    MO_Sub {}           -> ty1  -- of first arg
    MO_Mul    r         -> cmmBits r
    MO_S_MulMayOflo r   -> cmmBits r
    MO_S_Quot r         -> cmmBits r
    MO_S_Rem  r         -> cmmBits r
    MO_S_Neg  r         -> cmmBits r
    MO_U_MulMayOflo r   -> cmmBits r
    MO_U_Quot r         -> cmmBits r
    MO_U_Rem  r         -> cmmBits r

    MO_Eq {}            -> comparisonResultRep
    MO_Ne {}            -> comparisonResultRep
    MO_S_Ge {}          -> comparisonResultRep
    MO_S_Le {}          -> comparisonResultRep
    MO_S_Gt {}          -> comparisonResultRep
    MO_S_Lt {}          -> comparisonResultRep

    MO_U_Ge {}          -> comparisonResultRep
    MO_U_Le {}          -> comparisonResultRep
    MO_U_Gt {}          -> comparisonResultRep
    MO_U_Lt {}          -> comparisonResultRep

    MO_F_Add r          -> cmmFloat r
    MO_F_Sub r          -> cmmFloat r
    MO_F_Mul r          -> cmmFloat r
    MO_F_Quot r         -> cmmFloat r
    MO_F_Neg r          -> cmmFloat r
    MO_F_Eq  {}         -> comparisonResultRep
    MO_F_Ne  {}         -> comparisonResultRep
    MO_F_Ge  {}         -> comparisonResultRep
    MO_F_Le  {}         -> comparisonResultRep
    MO_F_Gt  {}         -> comparisonResultRep
    MO_F_Lt  {}         -> comparisonResultRep

    MO_And {}           -> ty1  -- Used for pointer masking
    MO_Or {}            -> ty1
    MO_Xor {}           -> ty1
    MO_Not   r          -> cmmBits r
    MO_Shl   r          -> cmmBits r
    MO_U_Shr r          -> cmmBits r
    MO_S_Shr r          -> cmmBits r

    MO_SS_Conv _ to     -> cmmBits to
    MO_UU_Conv _ to     -> cmmBits to
    MO_FS_Conv _ to     -> cmmBits to
    MO_SF_Conv _ to     -> cmmFloat to
    MO_FF_Conv _ to     -> cmmFloat to
  where
    (ty1:_) = tys

comparisonResultRep :: CmmType
comparisonResultRep = bWord  -- is it?


-- -----------------------------------------------------------------------------
-- machOpArgReps

-- | This function is used for debugging only: we can check whether an
-- application of a MachOp is "type-correct" by checking that the MachReps of
-- its arguments are the same as the MachOp expects.  This is used when
-- linting a CmmExpr.

machOpArgReps :: MachOp -> [Width]
machOpArgReps op =
  case op of
    MO_Add    r         -> [r,r]
    MO_Sub    r         -> [r,r]
    MO_Eq     r         -> [r,r]
    MO_Ne     r         -> [r,r]
    MO_Mul    r         -> [r,r]
    MO_S_MulMayOflo r   -> [r,r]
    MO_S_Quot r         -> [r,r]
    MO_S_Rem  r         -> [r,r]
    MO_S_Neg  r         -> [r]
    MO_U_MulMayOflo r   -> [r,r]
    MO_U_Quot r         -> [r,r]
    MO_U_Rem  r         -> [r,r]

    MO_S_Ge r           -> [r,r]
    MO_S_Le r           -> [r,r]
    MO_S_Gt r           -> [r,r]
    MO_S_Lt r           -> [r,r]

    MO_U_Ge r           -> [r,r]
    MO_U_Le r           -> [r,r]
    MO_U_Gt r           -> [r,r]
    MO_U_Lt r           -> [r,r]

    MO_F_Add r          -> [r,r]
    MO_F_Sub r          -> [r,r]
    MO_F_Mul r          -> [r,r]
    MO_F_Quot r         -> [r,r]
    MO_F_Neg r          -> [r]
    MO_F_Eq  r          -> [r,r]
    MO_F_Ne  r          -> [r,r]
    MO_F_Ge  r          -> [r,r]
    MO_F_Le  r          -> [r,r]
    MO_F_Gt  r          -> [r,r]
    MO_F_Lt  r          -> [r,r]

    MO_And   r          -> [r,r]
    MO_Or    r          -> [r,r]
    MO_Xor   r          -> [r,r]
    MO_Not   r          -> [r]
    MO_Shl   r          -> [r,wordWidth]
    MO_U_Shr r          -> [r,wordWidth]
    MO_S_Shr r          -> [r,wordWidth]

    MO_SS_Conv from _   -> [from]
    MO_UU_Conv from _   -> [from]
    MO_SF_Conv from _   -> [from]
    MO_FS_Conv from _   -> [from]
    MO_FF_Conv from _   -> [from]

-----------------------------------------------------------------------------
-- CallishMachOp
-----------------------------------------------------------------------------

-- CallishMachOps tend to be implemented by foreign calls in some backends,
-- so we separate them out.  In Cmm, these can only occur in a
-- statement position, in contrast to an ordinary MachOp which can occur
-- anywhere in an expression.
data CallishMachOp
  = MO_F64_Pwr
  | MO_F64_Sin
  | MO_F64_Cos
  | MO_F64_Tan
  | MO_F64_Sinh
  | MO_F64_Cosh
  | MO_F64_Tanh
  | MO_F64_Asin
  | MO_F64_Acos
  | MO_F64_Atan
  | MO_F64_Log
  | MO_F64_Exp
  | MO_F64_Sqrt
  | MO_F32_Pwr
  | MO_F32_Sin
  | MO_F32_Cos
  | MO_F32_Tan
  | MO_F32_Sinh
  | MO_F32_Cosh
  | MO_F32_Tanh
  | MO_F32_Asin
  | MO_F32_Acos
  | MO_F32_Atan
  | MO_F32_Log
  | MO_F32_Exp
  | MO_F32_Sqrt
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  | MO_S_QuotRem Width
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  | MO_U_QuotRem Width
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  | MO_U_QuotRem2 Width
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  | MO_Add2      Width
  | MO_U_Mul2    Width
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  | MO_WriteBarrier
  | MO_Touch         -- Keep variables live (when using interior pointers)
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  -- Note that these three MachOps all take 1 extra parameter than the
  -- standard C lib versions. The extra (last) parameter contains
  -- alignment of the pointers. Used for optimisation in backends.
  | MO_Memcpy
  | MO_Memset
  | MO_Memmove
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  | MO_PopCnt Width
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  deriving (Eq, Show)

pprCallishMachOp :: CallishMachOp -> SDoc
pprCallishMachOp mo = text (show mo)
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