Fix PR2808. When regalloc runs out of register, it spill a physical register around the live interval being allocated. Do not continue to try to spill another register, just grab the physical register and move on.
llvm-svn: 56381
diff --git a/llvm/lib/CodeGen/RegAllocLinearScan.cpp b/llvm/lib/CodeGen/RegAllocLinearScan.cpp
index 000dd41..df9d393 100644
--- a/llvm/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/llvm/lib/CodeGen/RegAllocLinearScan.cpp
@@ -855,9 +855,12 @@
// All registers must have inf weight. Just grab one!
minReg = BestPhysReg ? BestPhysReg : *RC->allocation_order_begin(*mf_);
if (cur->weight == HUGE_VALF ||
- li_->getApproximateInstructionCount(*cur) == 0)
+ li_->getApproximateInstructionCount(*cur) == 0) {
// Spill a physical register around defs and uses.
li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_);
+ assignRegOrStackSlotAtInterval(cur);
+ return;
+ }
}
// Find up to 3 registers to consider as spill candidates.