--- | For conversion back to vanilla C--
-
-elimSpillAndReload :: StackSlotMap -> LGraph M l -> FuelMonad (StackSlotMap, LGraph Middle l)
-elimSpillAndReload slots g = fold_blocks block (return (slots, [])) g >>= toGraph
- where toGraph (slots, l) = return (slots, of_block_list (lg_entry g) l)
- block (Block id t) z =
- do (slots, blocks) <- z
- (slots, t) <- tail t slots
- return (slots, Block id t : blocks)
- tail (ZLast l) slots = return (slots, ZLast l)
- tail (ZTail m t) slots =
- do (slots, t) <- tail t slots
- middle m t slots
- middle (Spill regs) t slots = foldUniqSet spill (return (slots, t)) regs
- middle (Reload regs) t slots = foldUniqSet reload (return (slots, t)) regs
- middle (NotSpillOrReload m) t slots = return (slots, ZTail m t)
- move f r z = do let reg = CmmLocal r
- (slots, t) <- z
- (slots, slot) <- getSlot slots reg
- return (slots, ZTail (f (CmmStack slot) reg) t)
- spill = move (\ slot reg -> MidAssign slot (CmmReg reg))
- reload = move (\ slot reg -> MidAssign reg (CmmReg slot))
+-- Generating spill and reload code
+regSlot :: LocalReg -> CmmExpr
+regSlot r = CmmStackSlot (RegSlot r) (widthInBytes $ typeWidth $ localRegType r)
+
+spill, reload :: LocalReg -> Middle
+spill r = MidStore (regSlot r) (CmmReg $ CmmLocal r)
+reload r = MidAssign (CmmLocal r) (CmmLoad (regSlot r) $ localRegType r)