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Teach if-conversion about instructions that were already predicated, e.g. conditional move.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37964 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -529,6 +529,7 @@ void IfConverter::ScanInstructions(BBInfo &BBI) {
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if (BBI.IsDone)
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return;
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bool AlreadyPredicated = BBI.Predicate.size() > 0;
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// First analyze the end of BB branches.
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BBI.TrueBB = BBI.FalseBB = NULL;
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BBI.BrCond.clear();
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@ -558,8 +559,18 @@ void IfConverter::ScanInstructions(BBInfo &BBI) {
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bool isCondBr = BBI.IsBrAnalyzable &&
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(TID->Flags & M_BRANCH_FLAG) != 0 && (TID->Flags & M_BARRIER_FLAG) == 0;
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if (!isPredicated && !isCondBr)
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BBI.NonPredSize++;
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if (!isCondBr) {
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if (!isPredicated)
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BBI.NonPredSize++;
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else if (!AlreadyPredicated) {
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// FIXME: This instruction is already predicated before the
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// if-conversion pass. It's probably something like a conditional move.
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// Mark this block unpredicable for now.
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BBI.IsUnpredicable = true;
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return;
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}
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}
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if (BBI.ClobbersPred && !isPredicated) {
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// Predicate modification instruction should end the block (except for
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@ -572,7 +583,7 @@ void IfConverter::ScanInstructions(BBInfo &BBI) {
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}
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// Predicate may have been modified, the subsequent (currently)
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// unpredocated instructions cannot be correctly predicated.
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// unpredicated instructions cannot be correctly predicated.
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BBI.IsUnpredicable = true;
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return;
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}
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