[SandboxVec] Boilerplate

This patch implements the new pass and registers it with the pass manager.
For context, this is a vectorizer that operates on Sandbox IR, which is a
transactional IR on top of LLVM IR.

Author: vporpo

llvm/include/llvm/Transforms/Vectorize/SandboxVectorizer/SandboxVectorizer.h

@@ -0,0 +1,31 @@
+//===- SandboxVectorizer.h --------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_TRANSFORMS_VECTORIZE_SANDBOXVECTORIZER_SANDBOXVECTORIZER_H
+#define LLVM_TRANSFORMS_VECTORIZE_SANDBOXVECTORIZER_SANDBOXVECTORIZER_H
+
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/ScalarEvolution.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/PassManager.h"
+#include "llvm/SandboxIR/SandboxIR.h"
+
+namespace llvm {
+
+class SandboxVectorizerPass : public PassInfoMixin<SandboxVectorizerPass> {
+  TargetTransformInfo *TTI = nullptr;
+
+public:
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+
+  bool runImpl(Function &F);
+};
+
+} // namespace llvm
+
+#endif // LLVM_TRANSFORMS_VECTORIZE_SANDBOXVECTORIZER_SANDBOXVECTORIZER_H

llvm/lib/Passes/PassBuilder.cpp

@@ -321,6 +321,7 @@
 #include "llvm/Transforms/Vectorize/LoopIdiomVectorize.h"
 #include "llvm/Transforms/Vectorize/LoopVectorize.h"
 #include "llvm/Transforms/Vectorize/SLPVectorizer.h"
+#include "llvm/Transforms/Vectorize/SandboxVectorizer/SandboxVectorizer.h"
 #include "llvm/Transforms/Vectorize/VectorCombine.h"
 #include <optional>
 

llvm/lib/Passes/PassRegistry.def

@@ -453,6 +453,7 @@ FUNCTION_PASS("reassociate", ReassociatePass())
 FUNCTION_PASS("redundant-dbg-inst-elim", RedundantDbgInstEliminationPass())
 FUNCTION_PASS("reg2mem", RegToMemPass())
 FUNCTION_PASS("safe-stack", SafeStackPass(TM))
+FUNCTION_PASS("sandbox-vectorizer", SandboxVectorizerPass())
 FUNCTION_PASS("scalarize-masked-mem-intrin", ScalarizeMaskedMemIntrinPass())
 FUNCTION_PASS("scalarizer", ScalarizerPass())
 FUNCTION_PASS("sccp", SCCPPass())

llvm/lib/Transforms/Vectorize/CMakeLists.txt

@@ -3,6 +3,7 @@ add_llvm_component_library(LLVMVectorize
   LoopIdiomVectorize.cpp
   LoopVectorizationLegality.cpp
   LoopVectorize.cpp
+  SandboxVectorizer/SandboxVectorizer.cpp
   SLPVectorizer.cpp
   Vectorize.cpp
   VectorCombine.cpp
@@ -18,6 +19,7 @@ add_llvm_component_library(LLVMVectorize
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Transforms
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Transforms/Vectorize
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Transforms/Vectorize/SandboxVectorizer
 
   DEPENDS
   intrinsics_gen
@@ -27,4 +29,5 @@ add_llvm_component_library(LLVMVectorize
   Core
   Support
   TransformUtils
+  SandboxIR
   )

llvm/lib/Transforms/Vectorize/SandboxVectorizer/SandboxVectorizer.cpp

@@ -0,0 +1,60 @@
+//===- SandboxVectorizer.cpp - Vectorizer based on Sandbox IR -------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Vectorize/SandboxVectorizer/SandboxVectorizer.h"
+#include "llvm/Support/CommandLine.h"
+
+using namespace llvm;
+
+#define SV_NAME "sandbox-vectorizer"
+#define DEBUG_TYPE "SBVec"
+
+cl::opt<bool>
+    SBVecDisable("sbvec-disable", cl::init(false), cl::Hidden,
+                 cl::desc("Disable the Sandbox Vectorization passes"));
+
+PreservedAnalyses SandboxVectorizerPass::run(Function &F,
+                                             FunctionAnalysisManager &AM) {
+  TTI = &AM.getResult<TargetIRAnalysis>(F);
+
+  bool Changed = runImpl(F);
+  if (!Changed)
+    return PreservedAnalyses::all();
+
+  PreservedAnalyses PA;
+  PA.preserveSet<CFGAnalyses>();
+  return PA;
+}
+
+bool SandboxVectorizerPass::runImpl(Function &F) {
+  if (SBVecDisable)
+    return false;
+
+  // If the target claims to have no vector registers don't attempt
+  // vectorization.
+  if (!TTI->getNumberOfRegisters(TTI->getRegisterClassForType(true))) {
+    LLVM_DEBUG(dbgs() << "SBVec: Target has no vector registers, abort.\n");
+    return false;
+  }
+
+  // Don't vectorize when the attribute NoImplicitFloat is used.
+  if (F.hasFnAttribute(Attribute::NoImplicitFloat))
+    return false;
+
+  sandboxir::Context Ctx(F.getContext());
+
+  LLVM_DEBUG(dbgs() << "SBVec: Analyzing blocks in " << F.getName() << ".\n");
+
+  // Create SandboxIR for `F`.
+  sandboxir::Function &SBF = *Ctx.createFunction(&F);
+
+  // TODO: Initialize SBVec Pass Manager
+  (void)SBF;
+
+  return false;
+}

llvm/test/Transforms/SandboxVec/boilerplate.ll

@@ -0,0 +1,11 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -passes=sandbox-vectorizer %s -S | FileCheck %s
+
+; This test checks that the pass was registered with the pass manager.
+; TODO: Remove this test once actual tests land.
+define void @boilerplate() {
+; CHECK-LABEL: define void @boilerplate() {
+; CHECK-NEXT:    ret void
+;
+  ret void
+}