[llvm] [LV] Factor out VF-independent code from cost model (NFC). (PR #192426)

[Florian Hahn via llvm-commits]

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@@ -34,22 +35,46 @@ class GeneratedRTChecks;
 
 namespace llvm {
 
+class AssumptionCache;
 class LoopInfo;
 class DominatorTree;
 class LoopVectorizationLegality;
 class LoopVectorizationCostModel;
 class PredicatedScalarEvolution;
 class LoopVectorizeHints;
+class RecurrenceDescriptor;
 class LoopVersioning;
 class OptimizationRemarkEmitter;
-class TargetTransformInfo;
 class TargetLibraryInfo;
 class VPRecipeBuilder;
 struct VPRegisterUsage;
 struct VFRange;
 
 extern cl::opt<bool> EnableVPlanNativePath;
 extern cl::opt<unsigned> ForceTargetInstructionCost;
+extern cl::opt<bool> PreferInLoopReductions;
+
+/// \return An upper bound for vscale based on TTI or the vscale_range
+/// attribute.
+std::optional<unsigned> getMaxVScale(const Function &F,
+                                     const TargetTransformInfo &TTI);
+
+/// Write a \p DebugMsg about vectorization to the debug output stream. If \p I
+/// is passed, the message relates to that particular instruction.
+#ifndef NDEBUG
+void debugVectorizationMessage(const StringRef Prefix, const StringRef DebugMsg,
+                               Instruction *I);
+#endif
+
+/// Reports an informative message: print \p Msg for debugging purposes as well
+/// as an optimization remark. Uses either \p I as location of the remark, or
+/// otherwise \p TheLoop. If \p DL is passed, use it as debug location for the
+/// remark. \p PassName is the name to use for the optimization remark.
+void reportVectorizationInfo(const char *PassName, const StringRef Msg,
+                             const StringRef ORETag,
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fhahn wrote:

those have been moved back to LoopVectorize.cpp

https://github.com/llvm/llvm-project/pull/192426