Imported Upstream version 5.18.0.234

Former-commit-id: 8071ec1a8c5eaa9be24b41745add19297608001f

external/llvm/lib/Support/BranchProbability.cpp

@@ -1,116 +0,0 @@
-//===-------------- lib/Support/BranchProbability.cpp -----------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements Branch Probability class.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/BranchProbability.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/Format.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cassert>
-
-using namespace llvm;
-
-const uint32_t BranchProbability::D;
-
-raw_ostream &BranchProbability::print(raw_ostream &OS) const {
-  if (isUnknown())
-    return OS << "?%";
-
-  // Get a percentage rounded to two decimal digits. This avoids
-  // implementation-defined rounding inside printf.
-  double Percent = rint(((double)N / D) * 100.0 * 100.0) / 100.0;
-  return OS << format("0x%08" PRIx32 " / 0x%08" PRIx32 " = %.2f%%", N, D,
-                      Percent);
-}
-
-#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
-LLVM_DUMP_METHOD void BranchProbability::dump() const { print(dbgs()) << '\n'; }
-#endif
-
-BranchProbability::BranchProbability(uint32_t Numerator, uint32_t Denominator) {
-  assert(Denominator > 0 && "Denominator cannot be 0!");
-  assert(Numerator <= Denominator && "Probability cannot be bigger than 1!");
-  if (Denominator == D)
-    N = Numerator;
-  else {
-    uint64_t Prob64 =
-        (Numerator * static_cast<uint64_t>(D) + Denominator / 2) / Denominator;
-    N = static_cast<uint32_t>(Prob64);
-  }
-}
-
-BranchProbability
-BranchProbability::getBranchProbability(uint64_t Numerator,
-                                        uint64_t Denominator) {
-  assert(Numerator <= Denominator && "Probability cannot be bigger than 1!");
-  // Scale down Denominator to fit in a 32-bit integer.
-  int Scale = 0;
-  while (Denominator > UINT32_MAX) {
-    Denominator >>= 1;
-    Scale++;
-  }
-  return BranchProbability(Numerator >> Scale, Denominator);
-}
-
-// If ConstD is not zero, then replace D by ConstD so that division and modulo
-// operations by D can be optimized, in case this function is not inlined by the
-// compiler.
-template <uint32_t ConstD>
-static uint64_t scale(uint64_t Num, uint32_t N, uint32_t D) {
-  if (ConstD > 0)
-    D = ConstD;
-
-  assert(D && "divide by 0");
-
-  // Fast path for multiplying by 1.0.
-  if (!Num || D == N)
-    return Num;
-
-  // Split Num into upper and lower parts to multiply, then recombine.
-  uint64_t ProductHigh = (Num >> 32) * N;
-  uint64_t ProductLow = (Num & UINT32_MAX) * N;
-
-  // Split into 32-bit digits.
-  uint32_t Upper32 = ProductHigh >> 32;
-  uint32_t Lower32 = ProductLow & UINT32_MAX;
-  uint32_t Mid32Partial = ProductHigh & UINT32_MAX;
-  uint32_t Mid32 = Mid32Partial + (ProductLow >> 32);
-
-  // Carry.
-  Upper32 += Mid32 < Mid32Partial;
-
-  // Check for overflow.
-  if (Upper32 >= D)
-    return UINT64_MAX;
-
-  uint64_t Rem = (uint64_t(Upper32) << 32) | Mid32;
-  uint64_t UpperQ = Rem / D;
-
-  // Check for overflow.
-  if (UpperQ > UINT32_MAX)
-    return UINT64_MAX;
-
-  Rem = ((Rem % D) << 32) | Lower32;
-  uint64_t LowerQ = Rem / D;
-  uint64_t Q = (UpperQ << 32) + LowerQ;
-
-  // Check for overflow.
-  return Q < LowerQ ? UINT64_MAX : Q;
-}
-
-uint64_t BranchProbability::scale(uint64_t Num) const {
-  return ::scale<D>(Num, N, D);
-}
-
-uint64_t BranchProbability::scaleByInverse(uint64_t Num) const {
-  return ::scale<0>(Num, D, N);
-}