[llvm] [LV][NFC] Print VPlan's transformation pipline (PR #72665)

[Kolya Panchenko via llvm-commits]

https://github.com/nikolaypanchenko created https://github.com/llvm/llvm-project/pull/72665

Print `VPlan` before each pass in `VPlanTransforms::optimize` with a debug type `vplan-xforms`.

>From 0922a18b172aa636ef70ea0ab3569a6d6dd423d8 Mon Sep 17 00:00:00 2001
From: Kolya Panchenko <kolya.panchenko at sifive.com>
Date: Fri, 17 Nov 2023 07:09:08 -0800
Subject: [PATCH] [LV][NFC] Print VPlan's transformation pipline

Print `VPlan` before each pass in `VPlanTransforms::optimize` with a
debug type `vplan-xforms`.
---
 .../Transforms/Vectorize/VPlanTransforms.cpp  | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index 0eaaa037ad5782f..142cda07adbd763 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -24,6 +24,8 @@
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/PatternMatch.h"
 
+#define DEBUG_TYPE "vplan-xforms"
+
 using namespace llvm;
 
 using namespace llvm::PatternMatch;
@@ -871,16 +873,39 @@ static void simplifyRecipes(VPlan &Plan, LLVMContext &Ctx) {
 }
 
 void VPlanTransforms::optimize(VPlan &Plan, ScalarEvolution &SE) {
+  LLVM_DEBUG(dbgs() << "LV: --- VPlan before removeRedundantCanonicalIVs ---\n";
+             Plan.dump(); dbgs() << "\n\n");
   removeRedundantCanonicalIVs(Plan);
+
+  LLVM_DEBUG(
+      dbgs() << "LV: --- VPlan before removeRedundantInductionCasts ---\n";
+      Plan.dump(); dbgs() << "\n\n");
   removeRedundantInductionCasts(Plan);
 
+  LLVM_DEBUG(dbgs() << "LV: --- VPlan before optimizeInductions ---\n";
+             Plan.dump(); dbgs() << "\n\n");
   optimizeInductions(Plan, SE);
+
+  LLVM_DEBUG(dbgs() << "LV: --- VPlan before simplifyRecipes ---\n";
+             Plan.dump(); dbgs() << "\n\n");
   simplifyRecipes(Plan, SE.getContext());
+
+  LLVM_DEBUG(dbgs() << "LV: --- VPlan before removeDeadRecipes ---\n";
+             Plan.dump(); dbgs() << "\n\n");
   removeDeadRecipes(Plan);
 
+  LLVM_DEBUG(
+      dbgs() << "LV: --- VPlan before createAndOptimizeReplicateRegions ---\n";
+      Plan.dump(); dbgs() << "\n\n");
   createAndOptimizeReplicateRegions(Plan);
 
+  LLVM_DEBUG(
+      dbgs() << "LV: --- VPlan before removeRedundantExpandSCEVRecipes ---\n";
+      Plan.dump(); dbgs() << "\n\n");
   removeRedundantExpandSCEVRecipes(Plan);
+
+  LLVM_DEBUG(dbgs() << "LV: --- VPlan before mergeBlocksIntoPredecessors ---\n";
+             Plan.dump(); dbgs() << "\n\n");
   mergeBlocksIntoPredecessors(Plan);
 }