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Spills should be hoisted out of loops, but we don't want to hoist them
to dominating blocks at the same loop depth. That could cause the spills
to be executed more often.

llvm-svn: 134782
This commit is contained in:
Jakob Stoklund Olesen 2011-07-09 01:02:44 +00:00
parent 8971e4c595
commit aef38c4f35
1 changed files with 1 additions and 1 deletions
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lib/CodeGen/InlineSpiller.cpp
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@ -344,7 +344,7 @@ MachineInstr *InlineSpiller::traceSiblingValue(unsigned UseReg, VNInfo *UseVNI,
// This is a valid spill location dominating UseVNI.
// Prefer to spill at a smaller loop depth.
unsigned Depth = Loops.getLoopDepth(MBB);
if (Depth <= SpillDepth) {
if (Depth < SpillDepth) {
DEBUG(dbgs() << " spill depth " << Depth << ": " << PrintReg(Reg)
<< ':' << VNI->id << '@' << VNI->def << '\n');
SVI.SpillReg = Reg;