}

std::optional<llvm::SmallDenseMap<char, int64_t>> EquationToMap(
    llvm::StringRef equation) {
  llvm::SmallDenseMap<char, int64_t> map;
  for (int64_t i = 0; i < equation.size(); ++i) {
    if (!std::isalpha(equation[i])) {
      // Unsupported character in the equation.
      return std::nullopt;
    }
    if (map.count(equation[i])) {
      // Duplicate character in the equation.
      return std::nullopt;
    }

namespace tensorflow {
namespace tfcompile {

namespace {

using BufferInfo = xla::cpu_function_runtime::BufferInfo;

bool IsAlpha(char c) {
  return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}

bool IsAlphaNum(char c) { return IsAlpha(c) || (c >= '0' && c <= '9'); }

// Convert an XLA type into a C++ type.
Status XLATypeToCpp(xla::PrimitiveType type, string* str) {
  switch (type) {

capitaliseAllWords(String); public static String uncapitaliseAllWords(String); public static String getNestedString(String, String); public static String getNestedString(String, String, String); public static int countMatches(String, String); public static boolean isAlpha(String); public static boolean isWhitespace(String); public static boolean isAlphaSpace(String); public static boolean isAlphanumeric(String); public static boolean isAlphanumericSpace(String); public static boolean isNumeric(String); public static...