Don't try and coalesce RealReg->RealReg moves

f20b0d8a · Ben.Lippmeier@anu.edu.au · f9288086 · f20b0d8a
Commit f20b0d8a authored May 19, 2009 by Ben.Lippmeier@anu.edu.au
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compiler/nativeGen/RegAlloc/Graph/Main.hs compiler/nativeGen/RegAlloc/Graph/Main.hs +7 -3

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--- 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