XCore target: Lower FRAME_TO_ARGS_OFFSET

This requires a knowledge of the stack size which is not known until
the frame is complete, hence the need for the XCoreFTAOElim pass
which lowers the XCoreISD::FRAME_TO_ARGS_OFFSET instrution into its
final form.

llvm-svn: 198614

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Target/XCore/XCoreTargetMachine.cpp b/llvm/lib/Target/XCore/XCoreTargetMachine.cpp
index 21027270911..781a87b1e91 100644
--- a/llvm/lib/Target/XCore/XCoreTargetMachine.cpp
+++ b/llvm/lib/Target/XCore/XCoreTargetMachine.cpp
@@ -48,6 +48,7 @@ public:
 
   virtual bool addPreISel();
   virtual bool addInstSelector();
+  virtual bool addPreEmitPass();
 };
 } // namespace
 
@@ -65,6 +66,11 @@ bool XCorePassConfig::addInstSelector() {
   return false;
 }
 
+bool XCorePassConfig::addPreEmitPass() {
+  addPass(createXCoreFrameToArgsOffsetEliminationPass());
+  return false;
+}
+
 // Force static initialization.
 extern "C" void LLVMInitializeXCoreTarget() {
   RegisterTargetMachine<XCoreTargetMachine> X(TheXCoreTarget);