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Avoid comparing invalid slot indexes, and assert that it doesn't happen.

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The SlotIndex created by the default construction does not represent a position
in the function, and it doesn't make sense to compare it to other indexes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-03-03 05:18:19 +00:00
parent acf9f48c5e
commit a97ff8a027
3 changed files with 5 additions and 6 deletions
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lib/CodeGen/RegAllocLinearScan.cpp
+2 -2
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@@ -458,7 +458,7 @@ unsigned RALinScan::attemptTrivialCoalescing(LiveInterval &cur, unsigned Reg) {
const LiveRange &range = cur.ranges.front();
VNInfo *vni = range.valno;
if (vni->isUnused())
if (vni->isUnused() || !vni->def.isValid())
return Reg;
unsigned CandReg;
@@ -993,7 +993,7 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur) {
// one, e.g. X86::mov32to32_. These move instructions are not coalescable.
if (!vrm_->getRegAllocPref(cur->reg) && cur->hasAtLeastOneValue()) {
VNInfo *vni = cur->begin()->valno;
if (!vni->isUnused()) {
if (!vni->isUnused() && vni->def.isValid()) {
MachineInstr *CopyMI = li_->getInstructionFromIndex(vni->def);
if (CopyMI && CopyMI->isCopy()) {
unsigned DstSubReg = CopyMI->getOperand(0).getSubReg();