From a4e89052ca5163bc1a33b5096b50e5a3fbb9fbd5 Mon Sep 17 00:00:00 2001 From: "benl@ouroborus.net" Date: Thu, 24 Jun 2010 08:27:17 +0000 Subject: [PATCH] NCG: Do the actual reversing of SCCs --- compiler/nativeGen/RegAlloc/Graph/Main.hs | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/compiler/nativeGen/RegAlloc/Graph/Main.hs b/compiler/nativeGen/RegAlloc/Graph/Main.hs index 6b01298..069c8c0 100644 --- a/compiler/nativeGen/RegAlloc/Graph/Main.hs +++ b/compiler/nativeGen/RegAlloc/Graph/Main.hs @@ -212,8 +212,10 @@ 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 = -- 1.7.10.4