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Don't hoist instructions that have implicit uses or defines. Before, it was

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hoisting out some "test" and "cmp" instructions. This was obvious badness.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54908 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-08-18 00:33:49 +00:00
parent e86389dd2a
commit d3361e996b
1 changed files with 5 additions and 0 deletions
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5
lib/CodeGen/MachineLICM.cpp
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@ -264,6 +264,11 @@ bool MachineLICM::IsLoopInvariantInst(MachineInstr &I) {
}
});
if (I.getDesc().getImplicitDefs() || I.getDesc().getImplicitUses()) {
DOUT << "Cannot hoist with implicit defines or uses\n";
return false;
}
// The instruction is loop invariant if all of its operands are.
for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
const MachineOperand &MO = I.getOperand(i);