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Use a latency value of 0 for the artificial edges inserted by
AddPseudoTwoAddrDeps. This lets the scheduling infrastructure avoid recalculating node heights. In very large testcases this was a major bottleneck. Thanks to Roman Levenstein for finding this! As a side effect, fold-pcmpeqd-0.ll is now scheduled better and it no longer requires spilling on x86-32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61778 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1252,7 +1252,7 @@ void RegReductionPriorityQueue<SF>::AddPseudoTwoAddrDeps() {
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!scheduleDAG->IsReachable(SuccSU, SU)) {
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DOUT << "Adding a pseudo-two-addr edge from SU # " << SU->NodeNum
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<< " to SU #" << SuccSU->NodeNum << "\n";
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scheduleDAG->AddPred(SU, SDep(SuccSU, SDep::Order, /*Latency=*/1,
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scheduleDAG->AddPred(SU, SDep(SuccSU, SDep::Order, /*Latency=*/0,
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/*Reg=*/0, /*isMustAlias=*/false,
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/*isArtificial=*/true));
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}
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@ -1,4 +1,4 @@
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; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin | not grep pcmpeqd
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; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin | grep pcmpeqd | count 1
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; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin | grep pcmpeqd | count 1
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; This testcase shouldn't need to spill the -1 value,
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