APIntHelper.cpp

Go to the documentation of this file.

//===-- APIntHelper.cpp - APInt helpers -------------------------*- C++ -*-===//
//
// Part of the LLZK Project, under the Apache License v2.0.
// See LICENSE.txt for license information.
// Copyright 2025 Veridise Inc.
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
 
#include "llzk/Util/APIntHelper.h"
 
namespace llzk {
 
llvm::APSInt expandingAdd(const llvm::APSInt &lhs, const llvm::APSInt &rhs) {
  unsigned requiredBits = std::max(lhs.getActiveBits(), rhs.getActiveBits()) + 1;
  unsigned newBitwidth = std::max({requiredBits, lhs.getBitWidth(), rhs.getBitWidth()});
  return lhs.extend(newBitwidth) + rhs.extend(newBitwidth);
}
 
llvm::APSInt expandingSub(const llvm::APSInt &lhs, const llvm::APSInt &rhs) {
  unsigned requiredBits = std::max(lhs.getActiveBits(), rhs.getActiveBits()) + 1;
  unsigned newBitwidth = std::max({requiredBits, lhs.getBitWidth(), rhs.getBitWidth()});
  return lhs.extend(newBitwidth) - rhs.extend(newBitwidth);
}
 
llvm::APSInt expandingMul(const llvm::APSInt &lhs, const llvm::APSInt &rhs) {
  unsigned requiredBits = lhs.getActiveBits() + rhs.getActiveBits();
  unsigned newBitwidth = std::max({requiredBits, lhs.getBitWidth(), rhs.getBitWidth()});
  return lhs.extend(newBitwidth) * rhs.extend(newBitwidth);
}
 
std::strong_ordering safeCmp(const llvm::APSInt &lhs, const llvm::APSInt &rhs) {
  unsigned requiredBits = std::max(lhs.getBitWidth(), rhs.getBitWidth());
  auto a = lhs.extend(requiredBits), b = rhs.extend(requiredBits);
  if (a < b) {
    return std::strong_ordering::less;
  } else if (a > b) {
    return std::strong_ordering::greater;
  } else {
    return std::strong_ordering::equal;
  }
}
 
} // namespace llzk