TwoAddressInstructionPass: Trigger -O0 behavior on optnone

While we cannot skip the whole TwoAddressInstructionPass even for -O0
there are some parts of the pass that are currently skipped at -O0 but
not for optnone. Changing this as there is no reason to have those two
hit different code paths here.

llvm-svn: 319721

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
index 28a4375cb28..c51340766b7 100644
--- a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
+++ b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
@@ -1661,6 +1661,10 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &Func) {
   else
     AA = nullptr;
   OptLevel = TM.getOptLevel();
+  // Disable optimizations if requested. We cannot skip the whole pass as some
+  // fixups are necessary for correctness.
+  if (skipFunction(*Func.getFunction()))
+    OptLevel = CodeGenOpt::None;
 
   bool MadeChange = false;