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

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47093 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-02-13 22:23:07 +00:00
parent 7649127ec1
commit ea06906559
2 changed files with 79 additions and 4 deletions
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9
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@ -151,7 +151,7 @@ namespace {
/// Update ExitBB PHINodes' to reflect this change.
void updatePHINodes(BasicBlock *ExitBB, BasicBlock *Latch,
BasicBlock *Header,
PHINode *IV, Instruction *IVIncrement);
PHINode *IV, Instruction *IVIncrement, Loop *LP);
/// moveExitCondition - Move exit condition EC into split condition block CondBB.
void moveExitCondition(BasicBlock *CondBB, BasicBlock *ActiveBB,
@ -1597,7 +1597,7 @@ void LoopIndexSplit::moveExitCondition(BasicBlock *CondBB, BasicBlock *ActiveBB,
new BranchInst(OrigDestBB, ExitingBB);
// Update PHINodes
updatePHINodes(ExitBB, ExitingBB, CondBB, IV, IVAdd);
updatePHINodes(ExitBB, ExitingBB, CondBB, IV, IVAdd, LP);
// Fix dominator info.
// ExitBB is now dominated by CondBB
@ -1637,7 +1637,8 @@ void LoopIndexSplit::moveExitCondition(BasicBlock *CondBB, BasicBlock *ActiveBB,
/// Update ExitBB PHINodes' to reflect this change.
void LoopIndexSplit::updatePHINodes(BasicBlock *ExitBB, BasicBlock *Latch,
BasicBlock *Header,
PHINode *IV, Instruction *IVIncrement) {
PHINode *IV, Instruction *IVIncrement,
Loop *LP) {
for (BasicBlock::iterator BI = ExitBB->begin(), BE = ExitBB->end();
BI != BE; ++BI) {
@ -1653,7 +1654,7 @@ void LoopIndexSplit::updatePHINodes(BasicBlock *ExitBB, BasicBlock *Latch,
for (Value::use_iterator UI = PHV->use_begin(), E = PHV->use_end();
UI != E; ++UI)
if (PHINode *U = dyn_cast<PHINode>(*UI))
if (U->getParent() == Header) {
if (LP->contains(U->getParent())) {
NewV = U;
break;
}

74
test/Transforms/LoopIndexSplit/2008-02-13-LoopLatchPHI.ll Normal file
View File

@ -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
}