[PATCH] D45209: [LoopInterchange] Add stats counter for number of interchanged loops.

[Florian Hahn via Phabricator via llvm-commits]

fhahn updated this revision to Diff 140917.
fhahn added a comment.

rebased


https://reviews.llvm.org/D45209

Files:
  lib/Transforms/Scalar/LoopInterchange.cpp
  test/Transforms/LoopInterchange/interchange-no-deps.ll


Index: test/Transforms/LoopInterchange/interchange-no-deps.ll
===================================================================
--- test/Transforms/LoopInterchange/interchange-no-deps.ll
+++ test/Transforms/LoopInterchange/interchange-no-deps.ll
@@ -1,5 +1,6 @@
 ; RUN: opt < %s -loop-interchange -simplifycfg -pass-remarks-output=%t \
-; RUN:     -pass-remarks=loop-interchange -pass-remarks-missed=loop-interchange -S
+; RUN:     -pass-remarks=loop-interchange -pass-remarks-missed=loop-interchange -stats -S 2>&1 \
+; RUN:     | FileCheck -check-prefix=STATS %s
 ; RUN: FileCheck -input-file %t %s
 
 
@@ -87,3 +88,6 @@
 exit:                                 ; preds = %for1.inc
   ret i32 0
 }
+
+; Check stats, we interchanged 1 out of 3 loops.
+; STATS: 1 loop-interchange - Number of loops interchanged
Index: lib/Transforms/Scalar/LoopInterchange.cpp
===================================================================
--- lib/Transforms/Scalar/LoopInterchange.cpp
+++ lib/Transforms/Scalar/LoopInterchange.cpp
@@ -15,6 +15,7 @@
 
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/DependenceAnalysis.h"
@@ -51,6 +52,8 @@
 
 #define DEBUG_TYPE "loop-interchange"
 
+STATISTIC(LoopsInterchanged, "Number of loops interchanged");
+
 static cl::opt<int> LoopInterchangeCostThreshold(
     "loop-interchange-threshold", cl::init(0), cl::Hidden,
     cl::desc("Interchange if you gain more than this number"));
@@ -613,6 +616,7 @@
                                  LoopNestExit, LIL.hasInnerLoopReduction());
     LIT.transform();
     DEBUG(dbgs() << "Loops interchanged.\n");
+    LoopsInterchanged++;
     return true;
   }
 };


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