From e60b36cf92e1570284482eddb2eac3652e28c2eb Mon Sep 17 00:00:00 2001
From: Florian Hahn <flo@fhahn.com>
Date: Sat, 7 Dec 2019 08:52:36 +0000
Subject: [VPlan] Rename VPlanHCFGTransforms to VPlanTransforms (NFC).

The file is intended to gather various VPlan transformations, not only
CFG related transforms. Actually, the only transformation there is not
CFG related.

Reviewers: Ayal, gilr, hsaito, rengolin

Reviewed By: gilr

Differential Revision: https://reviews.llvm.org/D70732
---
 llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp | 86 +++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

(limited to 'llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp')

diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
new file mode 100644
index 00000000000..fb81a396bbb
--- /dev/null
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -0,0 +1,86 @@
+//===-- VPlanTransforms.cpp - Utility VPlan to VPlan transforms -----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file implements a set of utility VPlan to VPlan transformations.
+///
+//===----------------------------------------------------------------------===//
+
+#include "VPlanTransforms.h"
+#include "llvm/ADT/PostOrderIterator.h"
+
+using namespace llvm;
+
+void VPlanTransforms::VPInstructionsToVPRecipes(
+    Loop *OrigLoop, VPlanPtr &Plan,
+    LoopVectorizationLegality::InductionList *Inductions,
+    SmallPtrSetImpl<Instruction *> &DeadInstructions) {
+
+  auto *TopRegion = cast<VPRegionBlock>(Plan->getEntry());
+  ReversePostOrderTraversal<VPBlockBase *> RPOT(TopRegion->getEntry());
+
+  // Condition bit VPValues get deleted during transformation to VPRecipes.
+  // Create new VPValues and save away as condition bits. These will be deleted
+  // after finalizing the vector IR basic blocks.
+  for (VPBlockBase *Base : RPOT) {
+    VPBasicBlock *VPBB = Base->getEntryBasicBlock();
+    if (auto *CondBit = VPBB->getCondBit()) {
+      auto *NCondBit = new VPValue(CondBit->getUnderlyingValue());
+      VPBB->setCondBit(NCondBit);
+      Plan->addCBV(NCondBit);
+    }
+  }
+  for (VPBlockBase *Base : RPOT) {
+    // Do not widen instructions in pre-header and exit blocks.
+    if (Base->getNumPredecessors() == 0 || Base->getNumSuccessors() == 0)
+      continue;
+
+    VPBasicBlock *VPBB = Base->getEntryBasicBlock();
+    VPRecipeBase *LastRecipe = nullptr;
+    // Introduce each ingredient into VPlan.
+    for (auto I = VPBB->begin(), E = VPBB->end(); I != E;) {
+      VPRecipeBase *Ingredient = &*I++;
+      // Can only handle VPInstructions.
+      VPInstruction *VPInst = cast<VPInstruction>(Ingredient);
+      Instruction *Inst = cast<Instruction>(VPInst->getUnderlyingValue());
+      if (DeadInstructions.count(Inst)) {
+        Ingredient->eraseFromParent();
+        continue;
+      }
+
+      VPRecipeBase *NewRecipe = nullptr;
+      // Create VPWidenMemoryInstructionRecipe for loads and stores.
+      if (isa<LoadInst>(Inst) || isa<StoreInst>(Inst))
+        NewRecipe = new VPWidenMemoryInstructionRecipe(*Inst, nullptr /*Mask*/);
+      else if (PHINode *Phi = dyn_cast<PHINode>(Inst)) {
+        InductionDescriptor II = Inductions->lookup(Phi);
+        if (II.getKind() == InductionDescriptor::IK_IntInduction ||
+            II.getKind() == InductionDescriptor::IK_FpInduction) {
+          NewRecipe = new VPWidenIntOrFpInductionRecipe(Phi);
+        } else
+          NewRecipe = new VPWidenPHIRecipe(Phi);
+      } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Inst)) {
+        NewRecipe = new VPWidenGEPRecipe(GEP, OrigLoop);
+      } else {
+        // If the last recipe is a VPWidenRecipe, add Inst to it instead of
+        // creating a new recipe.
+        if (VPWidenRecipe *WidenRecipe =
+                dyn_cast_or_null<VPWidenRecipe>(LastRecipe)) {
+          WidenRecipe->appendInstruction(Inst);
+          Ingredient->eraseFromParent();
+          continue;
+        }
+        NewRecipe = new VPWidenRecipe(Inst);
+      }
+
+      NewRecipe->insertBefore(Ingredient);
+      LastRecipe = NewRecipe;
+      Ingredient->eraseFromParent();
+    }
+  }
+}
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