[MachineOutliner] Add optsize markings to outlined functions.

It doesn't matter much this late in the pipeline, but one place that
does check for it is the function alignment code.

Differential Revision: https://reviews.llvm.org/D46373

llvm-svn: 332415

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineOutliner.cpp b/llvm/lib/CodeGen/MachineOutliner.cpp
index a524fca972e..afee909eaa2 100644
--- a/llvm/lib/CodeGen/MachineOutliner.cpp
+++ b/llvm/lib/CodeGen/MachineOutliner.cpp
@@ -1253,6 +1253,14 @@ MachineOutliner::createOutlinedFunction(Module &M, const OutlinedFunction &OF,
   F->setLinkage(GlobalValue::InternalLinkage);
   F->setUnnamedAddr(GlobalValue::UnnamedAddr::Global);
 
+  // FIXME: Set nounwind, so we don't generate eh_frame? Haven't verified it's
+  // necessary.
+
+  // Set optsize/minsize, so we don't insert padding between outlined
+  // functions.
+  F->addFnAttr(Attribute::OptimizeForSize);
+  F->addFnAttr(Attribute::MinSize);
+
   // Save F so that we can add debug info later if we need to.
   CreatedIRFunctions.push_back(F);