[GreedyRA ORE] Add function level spill/reloads stats

[thegameg]

This looks good too, thanks! Please add a test or extend the ones in llvm/test/CodeGen/AArch64/arm64-spill-remarks.ll.

[skatkov]

In D100014#2673150, @thegameg wrote:

This looks good too, thanks! Please add a test or extend the ones in llvm/test/CodeGen/AArch64/arm64-spill-remarks.ll.

Sure, I plan to upload all patches for reviewers to see the end point and then will add tests...

[reames]

In D100014#2673174, @skatkov wrote:

In D100014#2673150, @thegameg wrote:

This looks good too, thanks! Please add a test or extend the ones in llvm/test/CodeGen/AArch64/arm64-spill-remarks.ll.

Sure, I plan to upload all patches for reviewers to see the end point and then will add tests...

Meta: Please don't do this. Each patch should stand on it's own with the tests which are needed to motivate this patch.

Also LGTM contingent on a test being added before landing.

[skatkov]

Test updated.

llvm/lib/CodeGen/RegAllocGreedy.cpp

if (!Stats.isEmpty()) {
     });
   }
   return Stats;
 }
 
 void RAGreedy::reportNumberOfSplillsReloads() {
   if (!ORE->allowExtraAnalysis(DEBUG_TYPE))
     return;
+  RAGreedyStats Stats;
   for (MachineLoop *L : *Loops)
-    reportNumberOfSplillsReloads(L);
+    Stats.add(reportNumberOfSplillsReloads(L));
+  // Process non-loop blocks.
+  for (MachineBasicBlock &MBB : *MF)
+    if (!Loops->getLoopFor(&MBB))
+      Stats.add(computeNumberOfSplillsReloads(MBB));
+  if (!Stats.isEmpty()) {
+    using namespace ore;
+
+    ORE->emit([&]() {
+      MachineOptimizationRemarkMissed R(DEBUG_TYPE, "SpillReload", DebugLoc(),
+                                        &MF->front());
+      Stats.report(R);
+      R << "generated in function";
+      return R;
+    });
+  }
 }
 
 bool RAGreedy::runOnMachineFunction(MachineFunction &mf) {
   LLVM_DEBUG(dbgs() << "********** GREEDY REGISTER ALLOCATION **********\n"
                     << "********** Function: " << mf.getName() << '\n');
 
   MF = &mf;
   TRI = MF->getSubtarget().getRegisterInfo();