From 02c4836f3d8fc1605710866e48ec11b3a2dff23d Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Wed, 13 Feb 2008 19:48:48 +0000
Subject: [PATCH] Keep track of exit value operand number when operands are
 swapped.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47082 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/LoopIndexSplit.cpp      |  7 +-
 .../LoopIndexSplit/2008-02-13-ExitValueNum.ll | 67 +++++++++++++++++++
 2 files changed, 73 insertions(+), 1 deletion(-)
 create mode 100644 test/Transforms/LoopIndexSplit/2008-02-13-ExitValueNum.ll

diff --git a/lib/Transforms/Scalar/LoopIndexSplit.cpp b/lib/Transforms/Scalar/LoopIndexSplit.cpp
index 683a038824a..2d30eb6ff56 100644
--- a/lib/Transforms/Scalar/LoopIndexSplit.cpp
+++ b/lib/Transforms/Scalar/LoopIndexSplit.cpp
@@ -1163,8 +1163,13 @@ void LoopIndexSplit::calculateLoopBounds(SplitInfo &SD) {
   if (ExitCondition->getPredicate() == ICmpInst::ICMP_SGT
       || ExitCondition->getPredicate() == ICmpInst::ICMP_UGT
       || ExitCondition->getPredicate() == ICmpInst::ICMP_SGE
-      || ExitCondition->getPredicate() == ICmpInst::ICMP_UGE)
+      || ExitCondition->getPredicate() == ICmpInst::ICMP_UGE) {
     ExitCondition->swapOperands();
+    if (ExitValueNum)
+      ExitValueNum = 0;
+    else
+      ExitValueNum = 1;
+  }
 
   switch (ExitCondition->getPredicate()) {
   case ICmpInst::ICMP_SGT:
diff --git a/test/Transforms/LoopIndexSplit/2008-02-13-ExitValueNum.ll b/test/Transforms/LoopIndexSplit/2008-02-13-ExitValueNum.ll
new file mode 100644
index 00000000000..9fa83e4f57f
--- /dev/null
+++ b/test/Transforms/LoopIndexSplit/2008-02-13-ExitValueNum.ll
@@ -0,0 +1,67 @@
+; RUN: llvm-as < %s | opt -disable-output -loop-index-split
+; 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]
+	%tmp1629 = icmp sgt i32 %j295.0.reg2mem.0, 0		; <i1> [#uses=1]
+	br i1 %tmp1629, label %bb1649, label %bb1632
+
+bb1632:		; preds = %bb1553
+	br label %bb1669
+
+bb1649:		; preds = %bb1553
+	br label %bb1669
+
+bb1669:		; preds = %bb1649, %bb1632
+	%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
+}
+