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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124843 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2011-02-04 01:10:12 +00:00
parent 9ecd1e7197
commit c8b90e22a8
1 changed files with 3 additions and 2 deletions
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lib/CodeGen/TailDuplication.cpp
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@ -504,8 +504,9 @@ TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB, MachineFunction &MF,
if (!I->isPHI() && !I->isDebugValue())
InstrCount += 1;
}
// Heuristically, don't tail-duplicate calls if it would expand code size,
// as it's less likely to be worth the extra cost.
// Don't tail-duplicate calls before register allocation. Calls presents a
// barrier to register allocation so duplicating them may end up increasing
// spills.
if (InstrCount > 1 && (PreRegAlloc && HasCall))
return false;