, cmmAvailableReloads
)
where
+
import CmmExpr
import CmmTx
import CmmLiveZ
import DFMonad
+import MkZipCfg
+import PprCmm()
+import ZipCfg
+import ZipCfgCmmRep
+import ZipDataflow
+
import FastString
import Maybe
-import MkZipCfg
import Outputable hiding (empty)
import qualified Outputable as PP
import Panic
-import PprCmm()
import UniqSet
-import ZipCfg
-import ZipCfgCmmRep
-import ZipDataflow
-- The point of this module is to insert spills and reloads to
-- establish the invariant that at a call (or at any proc point with
dualLivenessWithInsertion :: BPass M Last DualLive
dualLivenessWithInsertion = a_ft_b_unlimited dualLiveness insertSpillsAndReloads
-
dualLiveness :: BAnalysis M Last DualLive
dualLiveness = BComp "dual liveness" exit last middle first
where exit = empty
-- this pass again
middleDualLiveness :: DualLive -> M -> DualLive
-middleDualLiveness live m@(Spill regs) =
+middleDualLiveness live (Spill regs) = live'
-- live-in on-stack requirements are satisfied;
-- live-out in-regs obligations are created
- my_trace "before" (f4sep [ppr m, text "liveness is", ppr live']) $
- live'
where live' = DualLive { on_stack = on_stack live `minusRegSet` regs
- , in_regs = in_regs live `plusRegSet` regs }
+ , in_regs = in_regs live `plusRegSet` regs }
-middleDualLiveness live m@(Reload regs) =
+middleDualLiveness live (Reload regs) = live'
-- live-in in-regs requirements are satisfied;
-- live-out on-stack obligations are created
- my_trace "before" (f4sep [ppr m, text "liveness is", ppr live']) $
- live'
- where live' = DualLive { on_stack = on_stack live `plusRegSet` regs
- , in_regs = in_regs live `minusRegSet` regs }
+ where live' = DualLive { on_stack = on_stack live `plusRegSet` regs
+ , in_regs = in_regs live `minusRegSet` regs }
middleDualLiveness live (NotSpillOrReload m) = changeRegs (middleLiveness m) live
last (LastCall tgt Nothing) = changeRegs (gen tgt) empty
last (LastCall tgt (Just k)) =
-- nothing can be live in registers at this point
- -- only 'formals' can be in regs at this point
let live = env k in
if isEmptyUniqSet (in_regs live) then
DualLive (on_stack live) (gen tgt emptyRegSet)