[PATCH] D36703: IPRA: Exit early on functions without calls

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
Herald added a subscriber: wdng.

https://reviews.llvm.org/D36703

Files:
  lib/CodeGen/RegUsageInfoPropagate.cpp


Index: lib/CodeGen/RegUsageInfoPropagate.cpp
===================================================================
--- lib/CodeGen/RegUsageInfoPropagate.cpp
+++ lib/CodeGen/RegUsageInfoPropagate.cpp
@@ -21,6 +21,7 @@
 
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/Passes.h"
@@ -109,6 +110,10 @@
                << " ++++++++++++++++++++  \n");
   DEBUG(dbgs() << "MachineFunction : " << MF.getName() << "\n");
 
+  const MachineFrameInfo &MFI = MF.getFrameInfo();
+  if (!MFI.hasCalls() && !MFI.hasTailCall())
+    return false;
+
   bool Changed = false;
 
   for (MachineBasicBlock &MBB : MF) {


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