X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FnativeGen%2FRegAlloc%2FGraph%2FMain.hs;h=cdbe98755acf48e3a1952bb997911b94a1b5d850;hb=f8f0e76ad302fda30196ebc9230e5fcbc97be537;hp=6b01298ac68e1c2423d9d07a03d149f17d1c0336;hpb=1c0deb50a7d84e14e0a425a0e1b4293c19718bb3;p=ghc-hetmet.git

diff --git a/compiler/nativeGen/RegAlloc/Graph/Main.hs b/compiler/nativeGen/RegAlloc/Graph/Main.hs
index 6b01298..cdbe987 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Main.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Main.hs
@@ -43,7 +43,6 @@ maxSpinCount	= 10
 
 
 -- | The top level of the graph coloring register allocator.
---	
 regAlloc
 	:: (Outputable instr, Instruction instr)
 	=> DynFlags
@@ -169,9 +168,6 @@ regAlloc_spin
 		--	and rewrite SPILL/RELOAD pseudos into real instructions along the way
 		let code_final		= map stripLive code_spillclean
 
---		let spillNatTop		= mapGenBlockTop spillNatBlock
---		let code_final		= map spillNatTop code_nat
-		
 		-- record what happened in this stage for debugging
 		let stat		=
 			RegAllocStatsColored
@@ -212,8 +208,10 @@ regAlloc_spin
 			<- regSpill code_coalesced slotsFree rsSpill
 
 		-- recalculate liveness
---		let code_nat	= map stripLive code_spilled
-		code_relive	<- mapM regLiveness code_spilled
+		-- NOTE: we have to reverse the SCCs here to get them back into the reverse-dependency
+		--       order required by computeLiveness. If they're not in the correct order
+		--       that function will panic.
+		code_relive	<- mapM (regLiveness . reverseBlocksInTops) code_spilled
 
 		-- record what happened in this stage for debugging
 		let stat	=
@@ -238,9 +236,7 @@ regAlloc_spin
 			code_relive
 
 
-
 -- | Build a graph from the liveness and coalesce information in this code.
-
 buildGraph 
 	:: Instruction instr
 	=> [LiveCmmTop instr]
@@ -268,7 +264,6 @@ buildGraph code
 
 -- | Add some conflict edges to the graph.
 --	Conflicts between virtual and real regs are recorded as exclusions.
---
 graphAddConflictSet 
 	:: UniqSet Reg
 	-> Color.Graph VirtualReg RegClass RealReg
@@ -291,7 +286,6 @@ graphAddConflictSet set graph
 
 -- | Add some coalesence edges to the graph
 --	Coalesences between virtual and real regs are recorded as preferences.
---
 graphAddCoalesce 
 	:: (Reg, Reg) 
 	-> Color.Graph VirtualReg RegClass RealReg