A loop latch phi node may have uses inside loop, not just in loop header.

llvm-svn: 47093

1 files changed, 74 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopIndexSplit/2008-02-13-LoopLatchPHI.ll b/llvm/test/Transforms/LoopIndexSplit/2008-02-13-LoopLatchPHI.ll
new file mode 100644
index 00000000000..393299f3e09
--- /dev/null
+++ b/llvm/test/Transforms/LoopIndexSplit/2008-02-13-LoopLatchPHI.ll
@@ -0,0 +1,74 @@
+; RUN: llvm-as < %s | opt -loop-index-split -disable-output
+; PR 2011
+	%struct.CLAUSE_HELP = type { i32, i32, i32, i32, i32*, i32, %struct.LIST_NODE*, %struct.LIST_NODE*, i32, i32, %struct.LITERAL_HELP**, i32, i32, i32, i32 }
+	%struct.LIST_NODE = type { %struct.LIST_NODE*, i8* }
+	%struct.LITERAL_HELP = type { i32, i32, i32, %struct.CLAUSE_HELP*, %struct.term* }
+	%struct.anon = type { %struct.LIST_NODE* }
+	%struct.st = type { %struct.subst*, %struct.LIST_NODE*, %struct.LIST_NODE*, i16, i16 }
+	%struct.subst = type { %struct.subst*, i32, %struct.term* }
+	%struct.term = type { i32, %struct.anon, %struct.LIST_NODE*, i32, i32 }
+
+define fastcc %struct.LIST_NODE* @inf_HyperResolvents(%struct.CLAUSE_HELP* %Clause, %struct.subst* %Subst, %struct.LIST_NODE* %Restlits, i32 %GlobalMaxVar, %struct.LIST_NODE* %FoundMap, i32 %StrictlyMaximal, { %struct.st*, [3001 x %struct.term*], [4000 x %struct.term*], i32 }* %Index, i32* %Flags, i32* %Precedence) nounwind  {
+entry:
+	br i1 false, label %bb960, label %bb885
+
+bb885:		; preds = %entry
+	ret %struct.LIST_NODE* null
+
+bb960:		; preds = %entry
+	br i1 false, label %bb1097, label %bb1005.preheader
+
+bb1005.preheader:		; preds = %bb960
+	ret %struct.LIST_NODE* null
+
+bb1097:		; preds = %bb960
+	br i1 false, label %bb1269.preheader, label %bb1141.preheader
+
+bb1141.preheader:		; preds = %bb1097
+	ret %struct.LIST_NODE* null
+
+bb1269.preheader:		; preds = %bb1097
+	br i1 false, label %bb1318, label %bb1281
+
+bb1281:		; preds = %bb1269.preheader
+	ret %struct.LIST_NODE* null
+
+bb1318:		; preds = %bb1269.preheader
+	br i1 false, label %bb1459, label %bb.nph52
+
+bb.nph52:		; preds = %bb1318
+	ret %struct.LIST_NODE* null
+
+bb1459:		; preds = %bb1318
+	br i1 false, label %bb1553, label %bb.nph62
+
+bb.nph62:		; preds = %bb1459
+	ret %struct.LIST_NODE* null
+
+bb1553:		; preds = %bb1669, %bb1459
+	%j295.0.reg2mem.0 = phi i32 [ %storemerge110, %bb1669 ], [ 0, %bb1459 ]		; <i32> [#uses=2]
+	%Constraint403.2.reg2mem.0 = phi %struct.LIST_NODE* [ %Constraint403.1.reg2mem.0, %bb1669 ], [ null, %bb1459 ]		; <%struct.LIST_NODE*> [#uses=1]
+	br i1 false, label %bb1588, label %bb1616
+
+bb1588:		; preds = %bb1553
+	br label %bb1616
+
+bb1616:		; preds = %bb1588, %bb1553
+	%tmp1629 = icmp sgt i32 %j295.0.reg2mem.0, 0		; <i1> [#uses=1]
+	br i1 %tmp1629, label %bb1649, label %bb1632
+
+bb1632:		; preds = %bb1616
+	br label %bb1669
+
+bb1649:		; preds = %bb1616
+	br label %bb1669
+
+bb1669:		; preds = %bb1649, %bb1632
+	%Constraint403.1.reg2mem.0 = phi %struct.LIST_NODE* [ null, %bb1632 ], [ %Constraint403.2.reg2mem.0, %bb1649 ]		; <%struct.LIST_NODE*> [#uses=1]
+	%storemerge110 = add i32 %j295.0.reg2mem.0, 1		; <i32> [#uses=2]
+	%tmp1672 = icmp sgt i32 %storemerge110, 0		; <i1> [#uses=1]
+	br i1 %tmp1672, label %bb1678, label %bb1553
+
+bb1678:		; preds = %bb1669
+	ret %struct.LIST_NODE* null
+}