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|
-----------------------------------------------------------------------------
--
-- Machine-specific parts of the register allocator
--
-- (c) The University of Glasgow 1996-2004
--
-----------------------------------------------------------------------------
{-# OPTIONS -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://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
-- for details
module PPC.RegInfo (
JumpDest( DestBlockId ), getJumpDestBlockId,
canShortcut,
shortcutJump,
shortcutStatics
)
where
#include "nativeGen/NCG.h"
#include "HsVersions.h"
import PPC.Instr
import BlockId
import Cmm
import CLabel
import Unique
data JumpDest = DestBlockId BlockId
getJumpDestBlockId :: JumpDest -> Maybe BlockId
getJumpDestBlockId (DestBlockId bid) = Just bid
canShortcut :: Instr -> Maybe JumpDest
canShortcut _ = Nothing
shortcutJump :: (BlockId -> Maybe JumpDest) -> Instr -> Instr
shortcutJump _ other = other
-- Here because it knows about JumpDest
shortcutStatics :: (BlockId -> Maybe JumpDest) -> CmmStatics -> CmmStatics
shortcutStatics fn (Statics lbl statics)
= Statics lbl $ map (shortcutStatic fn) statics
-- we need to get the jump tables, so apply the mapping to the entries
-- of a CmmData too.
shortcutLabel :: (BlockId -> Maybe JumpDest) -> CLabel -> CLabel
shortcutLabel fn lab
| Just uq <- maybeAsmTemp lab = shortBlockId fn (mkBlockId uq)
| otherwise = lab
shortcutStatic :: (BlockId -> Maybe JumpDest) -> CmmStatic -> CmmStatic
shortcutStatic fn (CmmStaticLit (CmmLabel lab))
= CmmStaticLit (CmmLabel (shortcutLabel fn lab))
shortcutStatic fn (CmmStaticLit (CmmLabelDiffOff lbl1 lbl2 off))
= CmmStaticLit (CmmLabelDiffOff (shortcutLabel fn lbl1) lbl2 off)
-- slightly dodgy, we're ignoring the second label, but this
-- works with the way we use CmmLabelDiffOff for jump tables now.
shortcutStatic _ other_static
= other_static
shortBlockId
:: (BlockId -> Maybe JumpDest)
-> BlockId
-> CLabel
shortBlockId fn blockid =
case fn blockid of
Nothing -> mkAsmTempLabel uq
Just (DestBlockId blockid') -> shortBlockId fn blockid'
where uq = getUnique blockid
|
