Exit with nice warnings when register allocator run out of registers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63267 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 8cd82a6..8e8e8ff 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -2228,7 +2228,19 @@
unsigned Index = getInstructionIndex(MI);
if (pli.liveAt(Index)) {
vrm.addEmergencySpill(SpillReg, MI);
- pli.removeRange(getLoadIndex(Index), getStoreIndex(Index)+1);
+ unsigned StartIdx = getLoadIndex(Index);
+ unsigned EndIdx = getStoreIndex(Index)+1;
+ if (pli.isInOneLiveRange(StartIdx, EndIdx))
+ pli.removeRange(StartIdx, EndIdx);
+ else {
+ cerr << "Ran out of registers during register allocation!\n";
+ if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
+ cerr << "Please check your inline asm statement for invalid "
+ << "constraints:\n";
+ MI->print(cerr.stream(), tm_);
+ }
+ exit(1);
+ }
for (const unsigned* AS = tri_->getSubRegisters(SpillReg); *AS; ++AS) {
if (!hasInterval(*AS))
continue;