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Verify that one of the ranges produced by region splitting is allocatable.
We should not be attempting a region split if it won't lead to at least one directly allocatable interval. That could cause infinite splitting loops. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124893 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -812,8 +812,22 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg,
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// separate into connected components. Some components may be allocatable.
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SE.finish();
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if (VerifyEnabled)
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if (VerifyEnabled) {
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MF->verify(this, "After splitting live range around region");
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#ifndef NDEBUG
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// Make sure that at least one of the new intervals can allocate to PhysReg.
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// That was the whole point of splitting the live range.
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bool found = false;
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for (LiveRangeEdit::iterator I = LREdit.begin(), E = LREdit.end(); I != E;
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++I)
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if (!checkUncachedInterference(**I, PhysReg)) {
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found = true;
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break;
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}
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assert(found && "No allocatable intervals after pointless splitting");
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#endif
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}
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}
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unsigned RAGreedy::tryRegionSplit(LiveInterval &VirtReg, AllocationOrder &Order,
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