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SLPVectorizer: Add support for vectorizing trees that start at compare instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179504 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -100,7 +100,7 @@ struct SLPVectorizer : public BasicBlockPass {
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return true;
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}
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bool tryToVectorizeCandidate(BinaryOperator *V, BoUpSLP &R) {
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bool tryToVectorize(BinaryOperator *V, BoUpSLP &R) {
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if (!V) return false;
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// Try to vectorize V.
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if (tryToVectorizePair(V->getOperand(0), V->getOperand(1), R))
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@ -142,25 +142,42 @@ struct SLPVectorizer : public BasicBlockPass {
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bool Changed = false;
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for (BasicBlock::iterator it = BB->begin(), e = BB->end(); it != e; ++it) {
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if (isa<DbgInfoIntrinsic>(it)) continue;
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PHINode *P = dyn_cast<PHINode>(it);
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if (!P) return Changed;
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// Check that the PHI is a reduction PHI.
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if (P->getNumIncomingValues() != 2) return Changed;
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Value *Rdx = (P->getIncomingBlock(0) == BB ? P->getIncomingValue(0) :
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(P->getIncomingBlock(1) == BB ? P->getIncomingValue(1) : 0));
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// Check if this is a Binary Operator.
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BinaryOperator *BI = dyn_cast_or_null<BinaryOperator>(Rdx);
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if (!BI) continue;
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Value *Inst = BI->getOperand(0);
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if (Inst == P) Inst = BI->getOperand(1);
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Changed |= tryToVectorizeCandidate(dyn_cast<BinaryOperator>(Inst), R);
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// Try to vectorize reductions that use PHINodes.
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if (PHINode *P = dyn_cast<PHINode>(it)) {
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// Check that the PHI is a reduction PHI.
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if (P->getNumIncomingValues() != 2) return Changed;
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Value *Rdx = (P->getIncomingBlock(0) == BB ? P->getIncomingValue(0) :
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(P->getIncomingBlock(1) == BB ? P->getIncomingValue(1) :
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0));
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// Check if this is a Binary Operator.
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BinaryOperator *BI = dyn_cast_or_null<BinaryOperator>(Rdx);
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if (!BI)
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continue;
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Value *Inst = BI->getOperand(0);
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if (Inst == P) Inst = BI->getOperand(1);
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Changed |= tryToVectorize(dyn_cast<BinaryOperator>(Inst), R);
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continue;
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}
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// Try to vectorize trees that start at compare instructions.
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if (CmpInst *CI = dyn_cast<CmpInst>(it)) {
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if (tryToVectorizePair(CI->getOperand(0), CI->getOperand(1), R)) {
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Changed |= true;
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continue;
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}
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for (int i = 0; i < 2; ++i)
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if (BinaryOperator *BI = dyn_cast<BinaryOperator>(CI->getOperand(i)))
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Changed |= tryToVectorize(BI, R);
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continue;
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}
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}
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return Changed;
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}
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bool rollStoreChains(BoUpSLP &R) {
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bool vectorizeStoreChains(BoUpSLP &R) {
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bool Changed = false;
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// Attempt to sort and vectorize each of the store-groups.
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for (StoreListMap::iterator it = StoreRefs.begin(), e = StoreRefs.end();
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@ -192,17 +209,19 @@ struct SLPVectorizer : public BasicBlockPass {
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// he store instructions.
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BoUpSLP R(&BB, SE, DL, TTI, AA);
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// Vectorize trees that end at reductions.
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bool Changed = vectorizeReductions(&BB, R);
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if (!collectStores(&BB, R))
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return Changed;
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if (rollStoreChains(R)) {
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DEBUG(dbgs()<<"SLP: vectorized in \""<<BB.getParent()->getName()<<"\"\n");
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DEBUG(verifyFunction(*BB.getParent()));
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Changed |= true;
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// Vectorize trees that end at stores.
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if (collectStores(&BB, R)) {
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DEBUG(dbgs()<<"SLP: Found stores to vectorize.\n");
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Changed |= vectorizeStoreChains(R);
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}
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if (Changed) {
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DEBUG(dbgs()<<"SLP: vectorized \""<<BB.getParent()->getName()<<"\"\n");
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DEBUG(verifyFunction(*BB.getParent()));
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}
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return Changed;
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}
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53
test/Transforms/SLPVectorizer/X86/compare-reduce.ll
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53
test/Transforms/SLPVectorizer/X86/compare-reduce.ll
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@ -0,0 +1,53 @@
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; RUN: opt < %s -basicaa -slp-vectorizer -dce -S -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.7.0"
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@.str = private unnamed_addr constant [6 x i8] c"bingo\00", align 1
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;CHECK: @reduce_compare
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;CHECK: load <2 x double>
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;CHECK: fmul <2 x double>
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;CHECK: fmul <2 x double>
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;CHECK: fadd <2 x double>
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;CHECK: extractelement
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;CHECK: extractelement
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;CHECK: ret
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define void @reduce_compare(double* nocapture %A, i32 %n) {
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entry:
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%conv = sitofp i32 %n to double
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br label %for.body
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for.body: ; preds = %for.inc, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.inc ]
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%0 = shl nsw i64 %indvars.iv, 1
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%arrayidx = getelementptr inbounds double* %A, i64 %0
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%1 = load double* %arrayidx, align 8
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%mul1 = fmul double %conv, %1
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%mul2 = fmul double %mul1, 7.000000e+00
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%add = fadd double %mul2, 5.000000e+00
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%2 = or i64 %0, 1
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%arrayidx6 = getelementptr inbounds double* %A, i64 %2
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%3 = load double* %arrayidx6, align 8
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%mul8 = fmul double %conv, %3
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%mul9 = fmul double %mul8, 4.000000e+00
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%add10 = fadd double %mul9, 9.000000e+00
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%cmp11 = fcmp ogt double %add, %add10
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br i1 %cmp11, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([6 x i8]* @.str, i64 0, i64 0))
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 100
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc
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ret void
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}
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declare i32 @printf(i8* nocapture, ...)
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