Fix PR3391 and PR3864. Reg allocator infinite looping.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67544 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index e8296a7..912135a 100644
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -869,8 +869,12 @@
if (cur->weight == HUGE_VALF ||
li_->getApproximateInstructionCount(*cur) == 0) {
// Spill a physical register around defs and uses.
- li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_);
- assignRegOrStackSlotAtInterval(cur);
+ if (li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_))
+ assignRegOrStackSlotAtInterval(cur);
+ else {
+ cerr << "Ran out of registers during register allocation!\n";
+ exit(1);
+ }
return;
}
}