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Don't waste time unfolding simple loads. The unfolded copy won't be hoisted.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116081 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-10-08 18:59:19 +00:00
parent 1aca5bc135
commit e95f3195b8
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/MachineLICM.cpp
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@ -636,6 +636,10 @@ bool MachineLICM::IsProfitableToHoist(MachineInstr &MI) {
}
MachineInstr *MachineLICM::ExtractHoistableLoad(MachineInstr *MI) {
// Don't unfold simple loads.
if (MI->getDesc().canFoldAsLoad())
return 0;
// If not, we may be able to unfold a load and hoist that.
// First test whether the instruction is loading from an amenable
// memory location.