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Clamp down on sinking of lots of instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45841 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-01-10 22:35:15 +00:00
parent b38bec222c
commit 2445888208
1 changed files with 9 additions and 0 deletions
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9
lib/CodeGen/MachineSink.cpp
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@ -130,6 +130,15 @@ bool MachineSinking::ProcessBlock(MachineBasicBlock &MBB) {
/// SinkInstruction - Determine whether it is safe to sink the specified machine
/// instruction out of its current block into a successor.
bool MachineSinking::SinkInstruction(MachineInstr *MI) {
const TargetInstrDesc &TID = MI->getDesc();
// Ignore stuff that we obviously can't sink.
if (TID.mayStore() || TID.isCall() || TID.isReturn() || TID.isBranch())
return false;
if (TID.mayLoad())
return false;
// Don't sink things with side-effects we don't understand.
if (TII->hasUnmodelledSideEffects(MI))
return false;