[GreedyRA ORE] Compute ORE stats if extra analysis is enabled

To save compile time, avoid computation of stats if ORE will not emit it.
The motivation is to add more stats and compute it only if it will dumped.

Reviewers: reames, MatzeB, anemet, thegameg
Reviewed By: reames
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D100010

diff --git a/llvm/lib/CodeGen/RegAllocGreedy.cpp b/llvm/lib/CodeGen/RegAllocGreedy.cpp
index 26e7a1f..d3a9aeb 100644 (file)
--- a/llvm/lib/CodeGen/RegAllocGreedy.cpp
+++ b/llvm/lib/CodeGen/RegAllocGreedy.cpp
@@ -552,13 +552,7 @@ private:
                                     unsigned &FoldedSpills);
 
   /// Report the number of spills and reloads for each loop.
-  void reportNumberOfSplillsReloads() {
-    for (MachineLoop *L : *Loops) {
-      unsigned Reloads, FoldedReloads, Spills, FoldedSpills;
-      reportNumberOfSplillsReloads(L, Reloads, FoldedReloads, Spills,
-                                   FoldedSpills);
-    }
-  }
+  void reportNumberOfSplillsReloads();
 };
 
 } // end anonymous namespace
@@ -3183,6 +3177,16 @@ void RAGreedy::reportNumberOfSplillsReloads(MachineLoop *L, unsigned &Reloads,
   }
 }
 
+void RAGreedy::reportNumberOfSplillsReloads() {
+  if (!ORE->allowExtraAnalysis(DEBUG_TYPE))
+    return;
+  for (MachineLoop *L : *Loops) {
+    unsigned Reloads, FoldedReloads, Spills, FoldedSpills;
+    reportNumberOfSplillsReloads(L, Reloads, FoldedReloads, Spills,
+                                 FoldedSpills);
+  }
+}
+
 bool RAGreedy::runOnMachineFunction(MachineFunction &mf) {
   LLVM_DEBUG(dbgs() << "********** GREEDY REGISTER ALLOCATION **********\n"
                     << "********** Function: " << mf.getName() << '\n');