[PATCH] D117980: [SLP][NFC] Add debug logs for entry.

[Yueh-Ting Chen via Phabricator via llvm-commits]

eopXD created this revision.
eopXD added a reviewer: reames.
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Tell the users they are specifying something without vector register.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117980

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp


Index: llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
===================================================================
--- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -8079,8 +8079,11 @@
 
   // If the target claims to have no vector registers don't attempt
   // vectorization.
-  if (!TTI->getNumberOfRegisters(TTI->getRegisterClassForType(true)))
+  if (!TTI->getNumberOfRegisters(TTI->getRegisterClassForType(true))) {
+    LLVM_DEBUG(
+        dbgs() << "SLP: Didn't find any vector registers for target, abort.\n");
     return false;
+  }
 
   // Don't vectorize when the attribute NoImplicitFloat is used.
   if (F.hasFnAttribute(Attribute::NoImplicitFloat))


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