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Diffstat (limited to 'compiler/nativeGen/RegAlloc/Graph/Main.hs')
| -rw-r--r-- | compiler/nativeGen/RegAlloc/Graph/Main.hs | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/compiler/nativeGen/RegAlloc/Graph/Main.hs b/compiler/nativeGen/RegAlloc/Graph/Main.hs index 94b18aeb0a..d239d0d3c5 100644 --- a/compiler/nativeGen/RegAlloc/Graph/Main.hs +++ b/compiler/nativeGen/RegAlloc/Graph/Main.hs @@ -311,9 +311,13 @@ graphAddCoalesce (r1, r2) graph (vr2, classOfVirtualReg vr2) graph - | otherwise - = panic "RegAlloc.Graph.Main.graphAddCoalesce: can't coalesce two real regs" - + -- We can't coalesce two real regs, but there could well be existing + -- hreg,hreg moves in the input code. We'll just ignore these + -- for coalescing purposes. + | RegReal _ <- r1 + , RegReal _ <- r2 + = graph + -- | Patch registers in code using the reg -> reg mapping in this graph. patchRegsFromGraph |