JIT: Add some metrics for widening IVs (#99051)

Forgot to add these as part of the IV widening PR.
dotnet · Feb 29, 2024 · 537052c · 537052c
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commit 537052c
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diff --git a/src/coreclr/jit/inductionvariableopts.cpp b/src/coreclr/jit/inductionvariableopts.cpp
@@ -494,6 +494,8 @@ PhaseStatus Compiler::optInductionVariables()
         DBEXEC(verbose, FlowGraphNaturalLoop::Dump(loop));
         scevContext.ResetForLoop(loop);
 
+        int numWidened = 0;
+
         for (Statement* stmt : loop->GetHeader()->Statements())
         {
             if (!stmt->IsPhiDefnStmt())
@@ -666,6 +668,14 @@ PhaseStatus Compiler::optInductionVariables()
             }
 
             optSinkWidenedIV(lcl->GetLclNum(), newLclNum, loop);
+
+            numWidened++;
+        }
+
+        Metrics.WidenedIVs += numWidened;
+        if (numWidened > 0)
+        {
+            Metrics.LoopsIVWidened++;
         }
     }
 

diff --git a/src/coreclr/jit/jitmetadatalist.h b/src/coreclr/jit/jitmetadatalist.h
@@ -33,6 +33,8 @@ JITMETADATAMETRIC(LoopsCloned,                 int,              0)
 JITMETADATAMETRIC(LoopsUnrolled,               int,              0)
 JITMETADATAMETRIC(LoopAlignmentCandidates,     int,              0)
 JITMETADATAMETRIC(LoopsAligned,                int,              0)
+JITMETADATAMETRIC(LoopsIVWidened,              int,              0)
+JITMETADATAMETRIC(WidenedIVs,                  int,              0)
 JITMETADATAMETRIC(VarsInSsa,                   int,              0)
 JITMETADATAMETRIC(HoistedExpressions,          int,              0)
 JITMETADATAMETRIC(RedundantBranchesEliminated, int,              JIT_METADATA_HIGHER_IS_BETTER)