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confree
2014 Aug 15
3
[LLVMdev] Physical register definition removed by MachineCSE
Hi,
My target has a special configuration register that many instructions
read implicitly, configuring for example if an add instruction should
saturate at over/underflow or not.
Now, I have a problem where the MachineCSE removes a setting of this
configuration register in a basic block, because
MachineCSE::isPhysDefTriviallyDead can't find any uses of it in the
basic block where