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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.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56381 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-09-20 01:28:05 +00:00
parent 4070e60efe
commit 5e8d9def77
2 changed files with 26 additions and 1 deletions
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5
lib/CodeGen/RegAllocLinearScan.cpp
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@ -855,9 +855,12 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
// 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.