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Diffstat (limited to 'compiler/nativeGen/RegAlloc/Graph/Main.hs')
| -rw-r--r-- | compiler/nativeGen/RegAlloc/Graph/Main.hs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/compiler/nativeGen/RegAlloc/Graph/Main.hs b/compiler/nativeGen/RegAlloc/Graph/Main.hs index 6b01298ac6..069c8c0069 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 = |