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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134782 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-07-09 01:02:44 +00:00
parent f86a547419
commit 4f4a6fcd16
1 changed files with 1 additions and 1 deletions
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2
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;