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Make the tail duplication threshold accessible from the command line instead of hardcoded
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13025 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -28,11 +28,15 @@
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/ValueHolder.h"
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#include "llvm/Transforms/Utils/Local.h"
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#include "Support/CommandLine.h"
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#include "Support/Debug.h"
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#include "Support/Statistic.h"
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using namespace llvm;
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namespace {
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cl::opt<unsigned>
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Threshold("taildup-threshold", cl::desc("Max block size to tail duplicate"),
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cl::init(6), cl::Hidden);
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Statistic<> NumEliminated("tailduplicate",
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"Number of unconditional branches eliminated");
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Statistic<> NumPHINodes("tailduplicate", "Number of phi nodes inserted");
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@ -106,7 +110,7 @@ bool TailDup::shouldEliminateUnconditionalBranch(TerminatorInst *TI) {
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while (isa<PHINode>(*I)) ++I;
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for (unsigned Size = 0; I != Dest->end(); ++Size, ++I)
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if (Size == 6) return false; // The block is too large...
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if (Size == Threshold) return false; // The block is too large...
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// Do not tail duplicate a block that has thousands of successors into a block
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// with a single successor if the block has many other predecessors. This can
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