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SLPVectorizer: Sink and enable CSE for ExtractElements.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186145 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1320,6 +1320,9 @@ void BoUpSLP::vectorizeTree() {
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it != e; ++it) {
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Value *Scalar = it->Scalar;
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llvm::User *User = it->User;
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// Skip users that we already RAUW. This happens when one instruction
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// has multiple uses of the same value.
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if (std::find(Scalar->use_begin(), Scalar->use_end(), User) ==
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Scalar->use_end())
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continue;
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@ -1337,8 +1340,18 @@ void BoUpSLP::vectorizeTree() {
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Instruction *Loc = 0;
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if (PHINode *PN = dyn_cast<PHINode>(Vec)) {
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Loc = PN->getParent()->getFirstInsertionPt();
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} else if (Instruction *Iv = dyn_cast<Instruction>(Vec)){
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Loc = ++((BasicBlock::iterator)*Iv);
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} else if (isa<Instruction>(Vec)){
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if (PHINode *PH = dyn_cast<PHINode>(User)) {
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for (int i = 0, e = PH->getNumIncomingValues(); i != e; ++i) {
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if (PH->getIncomingValue(i) == Scalar) {
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Loc = PH->getIncomingBlock(i)->getTerminator();
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break;
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}
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}
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assert(Loc && "Unable to find incoming value for the PHI");
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} else {
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Loc = cast<Instruction>(User);
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}
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} else {
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Loc = F->getEntryBlock().begin();
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}
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@ -1433,24 +1446,25 @@ void BoUpSLP::optimizeGatherSequence() {
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BasicBlock *BB = *I;
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// For all instructions in the function:
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for (BasicBlock::iterator it = BB->begin(), e = BB->end(); it != e; ++it) {
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InsertElementInst *Insert = dyn_cast<InsertElementInst>(it);
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if (!Insert || !GatherSeq.count(Insert))
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Instruction *In = it;
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if ((!isa<InsertElementInst>(In) && !isa<ExtractElementInst>(In)) ||
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!GatherSeq.count(In))
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continue;
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// Check if we can replace this instruction with any of the
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// visited instructions.
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for (SmallPtrSet<Instruction*, 16>::iterator v = Visited.begin(),
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ve = Visited.end(); v != ve; ++v) {
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if (Insert->isIdenticalTo(*v) &&
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DT->dominates((*v)->getParent(), Insert->getParent())) {
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Insert->replaceAllUsesWith(*v);
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ToRemove.push_back(Insert);
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Insert = 0;
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if (In->isIdenticalTo(*v) &&
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DT->dominates((*v)->getParent(), In->getParent())) {
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In->replaceAllUsesWith(*v);
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ToRemove.push_back(In);
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In = 0;
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break;
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}
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}
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if (Insert)
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Visited.insert(Insert);
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if (In)
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Visited.insert(In);
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}
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}
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@ -51,8 +51,8 @@ entry:
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; CHECK: @extr_user
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; CHECK: load <4 x i32>
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; CHECK-NEXT: extractelement <4 x i32>
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; CHECK: store <4 x i32>
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; CHECK: extractelement <4 x i32>
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; CHECK-NEXT: ret
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define i32 @extr_user(i32* noalias nocapture %B, i32* noalias nocapture %A, i32 %n, i32 %m) {
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entry:
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@ -81,8 +81,8 @@ entry:
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; In this example we have an external user that is not the first element in the vector.
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; CHECK: @extr_user1
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; CHECK: load <4 x i32>
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; CHECK-NEXT: extractelement <4 x i32>
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; CHECK: store <4 x i32>
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; CHECK: extractelement <4 x i32>
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; CHECK-NEXT: ret
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define i32 @extr_user1(i32* noalias nocapture %B, i32* noalias nocapture %A, i32 %n, i32 %m) {
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entry:
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@ -26,9 +26,9 @@ target triple = "x86_64-apple-macosx10.8.0"
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;CHECK: phi <2 x double>
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;CHECK: fadd <2 x double>
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;CHECK: fmul <2 x double>
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;CHECK: extractelement <2 x double>
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;CHECK: br
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;CHECK: store <2 x double>
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;CHECK: extractelement <2 x double>
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;CHECK: ret double
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define double @ext_user(double* noalias nocapture %B, double* noalias nocapture %A, i32 %n, i32 %m) {
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@ -23,10 +23,10 @@ target triple = "i386-apple-macosx10.9.0"
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;CHECK: fmul <3 x float>
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;CHECK: fadd <3 x float>
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; At the moment we don't sink extractelements.
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;CHECK: extractelement
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;CHECK: extractelement
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;CHECK: extractelement
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;CHECK: br
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;CHECK: extractelement
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;CHECK: extractelement
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;CHECK: extractelement
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;CHECK: ret
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define float @foo(float* nocapture readonly %A) {
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