module SPARC.ShortcutJump (
JumpDest(..),
canShortcut,
shortcutJump,
shortcutStatic,
shortBlockId
)
where
import SPARC.Instr
import SPARC.Imm
import CLabel
import BlockId
import Cmm
import Panic
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 (BlockId uq)))
shortcutStatic fn (CmmStaticLit (CmmLabelDiffOff lbl1 lbl2 off))
| Just uq <- maybeAsmTemp lbl1
= CmmStaticLit (CmmLabelDiffOff (shortBlockId fn (BlockId uq)) lbl2 off)
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"