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|
module SPARC.ShortcutJump (
JumpDest(..),
canShortcut,
shortcutJump,
shortcutStatic,
shortBlockId
)
where
import SPARC.Instr
import SPARC.Imm
import CLabel
import BlockId
import OldCmm
import Panic
import Unique
data JumpDest
= DestBlockId BlockId
| DestImm Imm
canShortcut :: Instr -> Maybe JumpDest
canShortcut _ = Nothing
shortcutJump :: (BlockId -> Maybe JumpDest) -> Instr -> Instr
shortcutJump _ other = other
shortcutStatic :: (BlockId -> Maybe JumpDest) -> CmmStatic -> CmmStatic
shortcutStatic fn (CmmStaticLit (CmmLabel lab))
| Just uq <- maybeAsmTemp lab
= CmmStaticLit (CmmLabel (shortBlockId fn (mkBlockId uq)))
shortcutStatic fn (CmmStaticLit (CmmLabelDiffOff lbl1 lbl2 off))
| Just uq <- maybeAsmTemp lbl1
= CmmStaticLit (CmmLabelDiffOff (shortBlockId fn (mkBlockId 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 =
case fn blockid of
Nothing -> mkAsmTempLabel (getUnique blockid)
Just (DestBlockId blockid') -> shortBlockId fn blockid'
Just (DestImm (ImmCLbl lbl)) -> lbl
_other -> panic "shortBlockId"
|
