[llvm] 65db7d3 - [NFC][SimplifyCFG] Add statistic to `FoldBranchToCommonDest()` fold

[Roman Lebedev via llvm-commits]

Author: Roman Lebedev
Date: 2020-11-26T22:51:21+03:00
New Revision: 65db7d38e0502db7b5753e974e630fd1663cb65b

URL: https://github.com/llvm/llvm-project/commit/65db7d38e0502db7b5753e974e630fd1663cb65b
DIFF: https://github.com/llvm/llvm-project/commit/65db7d38e0502db7b5753e974e630fd1663cb65b.diff

LOG: [NFC][SimplifyCFG] Add statistic to `FoldBranchToCommonDest()` fold

Added: 
    

Modified: 
    llvm/lib/Transforms/Utils/SimplifyCFG.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 7aeeee4188ed..0f4c1b4038e5 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -159,6 +159,8 @@ STATISTIC(
     NumLookupTablesHoles,
     "Number of switch instructions turned into lookup tables (holes checked)");
 STATISTIC(NumTableCmpReuses, "Number of reused switch table lookup compares");
+STATISTIC(NumFoldBranchToCommonDest,
+          "Number of branches folded into predecessor basic block");
 STATISTIC(
     NumHoistCommonCode,
     "Number of common instruction 'blocks' hoisted up to the begin block");
@@ -2710,6 +2712,12 @@ bool llvm::FoldBranchToCommonDest(BranchInst *BI, MemorySSAUpdater *MSSAU,
   const unsigned PredCount = pred_size(BB);
 
   bool Changed = false;
+
+  auto _ = make_scope_exit([&]() {
+    if (Changed)
+      ++NumFoldBranchToCommonDest;
+  });
+
   TargetTransformInfo::TargetCostKind CostKind =
     BB->getParent()->hasMinSize() ? TargetTransformInfo::TCK_CodeSize
                                   : TargetTransformInfo::TCK_SizeAndLatency;