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|
-----------------------------------------------------------------------------
--
-- Machine-specific parts of the register allocator
--
-- (c) The University of Glasgow 1996-2004
--
-----------------------------------------------------------------------------
module PPC.RegInfo (
JumpDest,
canShortcut,
shortcutJump,
shortcutStatic
)
where
#include "nativeGen/NCG.h"
#include "HsVersions.h"
import PPC.Regs
import PPC.Instr
import BlockId
import Cmm
import CLabel
import Outputable
data JumpDest = DestBlockId BlockId | DestImm Imm
canShortcut :: Instr -> Maybe JumpDest
canShortcut _ = Nothing
shortcutJump :: (BlockId -> Maybe JumpDest) -> Instr -> Instr
shortcutJump _ other = other
-- Here because it knows about JumpDest
shortcutStatic :: (BlockId -> Maybe JumpDest) -> CmmStatic -> CmmStatic
shortcutStatic fn (CmmStaticLit (CmmLabel lab))
| Just uq <- maybeAsmTemp lab
= CmmStaticLit (CmmLabel (shortBlockId fn (BlockId uq)))
shortcutStatic fn (CmmStaticLit (CmmLabelDiffOff lbl1 lbl2 off))
| Just uq <- maybeAsmTemp lbl1
= CmmStaticLit (CmmLabelDiffOff (shortBlockId fn (BlockId uq)) 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@(BlockId uq) =
case fn blockid of
Nothing -> mkAsmTempLabel uq
Just (DestBlockId blockid') -> shortBlockId fn blockid'
Just (DestImm (ImmCLbl lbl)) -> lbl
_other -> panic "shortBlockId"
|
