[LoopDist] Improve debug messages

The next patch will start using these for -Rpass-analysis so they won't
be internal-only anymore.

Move the 'Skipping; ' prefix that some of the message are using into the
'fail' function.  We don't want to include this prefix in
the -Rpass-analysis report.

llvm-svn: 267951

1 files changed, 6 insertions, 6 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopDistribute.cpp b/llvm/lib/Transforms/Scalar/LoopDistribute.cpp
index 7fa678a..1dcfcda 100644
--- a/llvm/lib/Transforms/Scalar/LoopDistribute.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopDistribute.cpp
@@ -602,19 +602,19 @@ public:
 
     BasicBlock *PH = L->getLoopPreheader();
     if (!PH)
-      return fail("Skipping; no preheader");
+      return fail("no preheader");
     if (!L->getExitBlock())
-      return fail("Skipping; multiple exit blocks");
+      return fail("multiple exit blocks");
     // LAA will check that we only have a single exiting block.
 
     // Currently, we only distribute to isolate the part of the loop with
     // dependence cycles to enable partial vectorization.
     if (LAI.canVectorizeMemory())
-      return fail("Skipping; memory operations are safe for vectorization");
+      return fail("memory operations are safe for vectorization");
 
     auto *Dependences = LAI.getDepChecker().getDependences();
     if (!Dependences || Dependences->empty())
-      return fail("Skipping; No unsafe dependences to isolate");
+      return fail("no unsafe dependences to isolate");
 
     InstPartitionContainer Partitions(L, LI, DT);
 
@@ -694,7 +694,7 @@ public:
     if (Pred.getComplexity() > (IsForced.getValueOr(false)
                                     ? PragmaDistributeSCEVCheckThreshold
                                     : DistributeSCEVCheckThreshold))
-      return fail("Too many SCEV run-time checks needed.\n");
+      return fail("too many SCEV run-time checks needed.\n");
 
     DEBUG(dbgs() << "\nDistributing loop: " << *L << "\n");
     // We're done forming the partitions set up the reverse mapping from
@@ -745,7 +745,7 @@ public:
 
   /// \brief Provide diagnostics then \return with false.
   bool fail(llvm::StringRef Message) {
-    DEBUG(dbgs() << Message << "\n");
+    DEBUG(dbgs() << "Skipping; " << Message << "\n");
     return false;
   }