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Don't do pre-splitting if doing so would create a value join that did not
exist before. Updating the live intervals in that care is tricky in the general case. Evan, if you see a tighter guard condition for this, let me know. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58560 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -89,6 +89,8 @@ namespace {
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AU.addPreservedID(StrongPHIEliminationID);
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AU.addPreservedID(StrongPHIEliminationID);
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else
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else
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AU.addPreservedID(PHIEliminationID);
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AU.addPreservedID(PHIEliminationID);
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AU.addRequired<MachineLoopInfo>();
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AU.addPreserved<MachineLoopInfo>();
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MachineFunctionPass::getAnalysisUsage(AU);
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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}
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@ -633,6 +635,14 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
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assert(0 && "Val# is defined by a dead def?");
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assert(0 && "Val# is defined by a dead def?");
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abort();
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abort();
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}
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}
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// Pre-splitting a vreg that does not have a PHI kill across a barrier
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// that is within a loop can potentially create a join that was not
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// present before, which would make updating the live intervals very
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// difficult. Bailout instead.
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MachineLoopInfo& MLI = getAnalysis<MachineLoopInfo>();
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if (!ValNo->hasPHIKill && MLI.getLoopFor(BarrierMBB))
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return false;
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// FIXME: For now, if definition is rematerializable, do not split.
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// FIXME: For now, if definition is rematerializable, do not split.
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MachineInstr *DefMI = (ValNo->def != ~0U)
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MachineInstr *DefMI = (ValNo->def != ~0U)
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