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|
{-# LANGUAGE CPP #-}
-----------------------------------------------------------------------------
--
-- Machine-specific parts of the register allocator
--
-- (c) The University of Glasgow 1996-2004
--
-----------------------------------------------------------------------------
module PPC.RegInfo (
JumpDest( DestBlockId ), getJumpDestBlockId,
canShortcut,
shortcutJump,
shortcutStatics
)
where
#include "HsVersions.h"
import GhcPrelude
import PPC.Instr
import BlockId
import Cmm
import CLabel
import Unique
import Outputable (ppr, text, Outputable, (<>))
data JumpDest = DestBlockId BlockId
-- Debug Instance
instance Outputable JumpDest where
ppr (DestBlockId bid) = text "jd<blk>:" <> ppr bid
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 blkId <- maybeLocalBlockLabel lab = shortBlockId fn blkId
| 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 w))
= CmmStaticLit (CmmLabelDiffOff (shortcutLabel fn lbl1) lbl2 off w)
-- 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 -> mkLocalBlockLabel uq
Just (DestBlockId blockid') -> shortBlockId fn blockid'
where uq = getUnique blockid
|
