Machine LICM increases register pressure and it almost always increase code size. For now, disable it for optimizing for size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63856 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/CodeGen/MachineLICM.cpp b/lib/CodeGen/MachineLICM.cpp
index 76d5f37794..dd32977f90 100644
--- a/lib/CodeGen/MachineLICM.cpp
+++ b/lib/CodeGen/MachineLICM.cpp
@@ -126,6 +126,10 @@ static bool LoopIsOuterMostWithPreheader(MachineLoop *CurLoop) {
 /// loop.
 ///
 bool MachineLICM::runOnMachineFunction(MachineFunction &MF) {
+  const Function *F = MF.getFunction();
+  if (F->hasFnAttr(Attribute::OptimizeForSize))
+    return false;
+
   DOUT << "******** Machine LICM ********\n";
 
   Changed = false;