Imported Upstream version 5.18.0.234

Former-commit-id: 8071ec1a8c5eaa9be24b41745add19297608001f

external/llvm/lib/Analysis/IndirectCallPromotionAnalysis.cpp

@@ -1,107 +0,0 @@
-//===-- IndirectCallPromotionAnalysis.cpp - Find promotion candidates ===//
-//
-//                      The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// Helper methods for identifying profitable indirect call promotion
-// candidates for an instruction when the indirect-call value profile metadata
-// is available.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/IndirectCallPromotionAnalysis.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/Analysis/IndirectCallSiteVisitor.h"
-#include "llvm/IR/CallSite.h"
-#include "llvm/IR/InstIterator.h"
-#include "llvm/IR/InstVisitor.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/IntrinsicInst.h"
-#include "llvm/ProfileData/InstrProf.h"
-#include "llvm/Support/Debug.h"
-#include <string>
-#include <utility>
-#include <vector>
-
-using namespace llvm;
-
-#define DEBUG_TYPE "pgo-icall-prom-analysis"
-
-// The percent threshold for the direct-call target (this call site vs the
-// remaining call count) for it to be considered as the promotion target.
-static cl::opt<unsigned> ICPRemainingPercentThreshold(
-    "icp-remaining-percent-threshold", cl::init(30), cl::Hidden, cl::ZeroOrMore,
-    cl::desc("The percentage threshold against remaining unpromoted indirect "
-             "call count for the promotion"));
-
-// The percent threshold for the direct-call target (this call site vs the
-// total call count) for it to be considered as the promotion target.
-static cl::opt<unsigned>
-    ICPTotalPercentThreshold("icp-total-percent-threshold", cl::init(5),
-                             cl::Hidden, cl::ZeroOrMore,
-                             cl::desc("The percentage threshold against total "
-                                      "count for the promotion"));
-
-// Set the maximum number of targets to promote for a single indirect-call
-// callsite.
-static cl::opt<unsigned>
-    MaxNumPromotions("icp-max-prom", cl::init(3), cl::Hidden, cl::ZeroOrMore,
-                     cl::desc("Max number of promotions for a single indirect "
-                              "call callsite"));
-
-ICallPromotionAnalysis::ICallPromotionAnalysis() {
-  ValueDataArray = llvm::make_unique<InstrProfValueData[]>(MaxNumPromotions);
-}
-
-bool ICallPromotionAnalysis::isPromotionProfitable(uint64_t Count,
-                                                   uint64_t TotalCount,
-                                                   uint64_t RemainingCount) {
-  return Count * 100 >= ICPRemainingPercentThreshold * RemainingCount &&
-         Count * 100 >= ICPTotalPercentThreshold * TotalCount;
-}
-
-// Indirect-call promotion heuristic. The direct targets are sorted based on
-// the count. Stop at the first target that is not promoted. Returns the
-// number of candidates deemed profitable.
-uint32_t ICallPromotionAnalysis::getProfitablePromotionCandidates(
-    const Instruction *Inst, uint32_t NumVals, uint64_t TotalCount) {
-  ArrayRef<InstrProfValueData> ValueDataRef(ValueDataArray.get(), NumVals);
-
-  DEBUG(dbgs() << " \nWork on callsite " << *Inst << " Num_targets: " << NumVals
-               << "\n");
-
-  uint32_t I = 0;
-  uint64_t RemainingCount = TotalCount;
-  for (; I < MaxNumPromotions && I < NumVals; I++) {
-    uint64_t Count = ValueDataRef[I].Count;
-    assert(Count <= RemainingCount);
-    DEBUG(dbgs() << " Candidate " << I << " Count=" << Count
-                 << "  Target_func: " << ValueDataRef[I].Value << "\n");
-
-    if (!isPromotionProfitable(Count, TotalCount, RemainingCount)) {
-      DEBUG(dbgs() << " Not promote: Cold target.\n");
-      return I;
-    }
-    RemainingCount -= Count;
-  }
-  return I;
-}
-
-ArrayRef<InstrProfValueData>
-ICallPromotionAnalysis::getPromotionCandidatesForInstruction(
-    const Instruction *I, uint32_t &NumVals, uint64_t &TotalCount,
-    uint32_t &NumCandidates) {
-  bool Res =
-      getValueProfDataFromInst(*I, IPVK_IndirectCallTarget, MaxNumPromotions,
-                               ValueDataArray.get(), NumVals, TotalCount);
-  if (!Res) {
-    NumCandidates = 0;
-    return ArrayRef<InstrProfValueData>();
-  }
-  NumCandidates = getProfitablePromotionCandidates(I, NumVals, TotalCount);
-  return ArrayRef<InstrProfValueData>(ValueDataArray.get(), NumVals);
-}