{name: "Add64F", argLength: 2, commutative: true},

	{name: "Sub8", argLength: 2}, // arg0 - arg1
	{name: "Sub16", argLength: 2},
	{name: "Sub32", argLength: 2},
	{name: "Sub64", argLength: 2},
	{name: "SubPtr", argLength: 2},
	{name: "Sub32F", argLength: 2},
	{name: "Sub64F", argLength: 2},

	{name: "Mul8", argLength: 2, commutative: true}, // arg0 * arg1
	{name: "Mul16", argLength: 2, commutative: true},

// Count counts the number of non-overlapping instances of substr in s.
// If substr is an empty string, Count returns 1 + the number of Unicode code points in s.
func Count(s, substr string) int {
	// special case
	if len(substr) == 0 {
		return utf8.RuneCountInString(s) + 1
	}
	if len(substr) == 1 {
		return bytealg.CountString(s, substr[0])
	}
	n := 0
	for {
		i := Index(s, substr)
		if i == -1 {
			return n
		}
		n++

    result = dot_h_fname.substr(pos + sizeof("/bin/") - 1);
  } else {
    pos = dot_h_fname.find("/genfiles/");
    if (pos != string::npos) {
      result = dot_h_fname.substr(pos + sizeof("/genfiles/") - 1);
    }
  }
  if (result.size() > sizeof("external/") &&
      result.compare(0, sizeof("external/") - 1, "external/") == 0) {
    result = result.substr(sizeof("external/") - 1);
    pos = result.find('/');

		$sysname =~ s/([a-z])([A-Z])/${1}_$2/g;	# turn FooBar into Foo_Bar
		$sysname =~ y/a-z/A-Z/;
		if($libc) {
			$sysname =~ y/A-Z/a-z/;
			$sysname = substr $sysname, 4;
			$funcname = "libc_$sysname";
		}
	}
	if($libc) {
		if($funcname eq "") {
			$sysname = substr $sysname, 4;
			$sysname =~ y/A-Z/a-z/;
			$funcname = "libc_$sysname";
		}
		$sysname = "abi.FuncPCABI0(${funcname}_trampoline)";
	}

  int idx_arrow = einsum_equation.find("->");
  StringRef calc_eq = einsum_equation.substr(0, idx_arrow);
  StringRef out_eq = einsum_equation.substr(idx_arrow + 2);

  int idx_comma = calc_eq.find(',');
  StringRef lhs_eq = calc_eq.substr(0, idx_comma);
  StringRef rhs_eq = calc_eq.substr(idx_comma + 1);

  std::string target_eq;
  if (is_lhs) {
    target_eq = lhs_eq;

  }

  // Parse equation.
  int idx_arrow = equation.find("->");
  StringRef calc_eq = equation.substr(0, idx_arrow);
  StringRef out_eq = equation.substr(idx_arrow + 2);

  int idx_comma = calc_eq.find(',');
  StringRef lhs_eq = calc_eq.substr(0, idx_comma);
  StringRef rhs_eq = calc_eq.substr(idx_comma + 1);

  if (absl::StrContains(rhs_eq, ",")) return false;

  int lhs_out_idx_start = out_eq.size();

                         data_types_str, "'"));
      }
      inside_subtype = false;
    }
    if (inside_subtype) continue;
    if (c == ',') {
      dtypes.push_back(
          std::string(data_types_str.substr(cur_pos, i - cur_pos)));
      cur_pos = i + 1;
    }
  }
  if (inside_subtype) {
    return errors::FailedPrecondition(
        absl::StrCat("Syntax error: expected a ')' in input data types '",

			errList = filemap[line]
		}

		// At least one of the errors in errList should match the current error.
		indices = indices[:0]
		for i, want := range errList {
			pattern, substr := strings.CutPrefix(want.Msg, " ERROR ")
			if !substr {
				var found bool
				pattern, found = strings.CutPrefix(want.Msg, " ERRORx ")
				if !found {
					panic("unreachable")
				}
			}

			errList = filemap[line]
		}

		// At least one of the errors in errList should match the current error.
		indices = indices[:0]
		for i, want := range errList {
			pattern, substr := strings.CutPrefix(want.text, " ERROR ")
			if !substr {
				var found bool
				pattern, found = strings.CutPrefix(want.text, " ERRORx ")
				if !found {
					panic("unreachable")
				}
			}

        "Invalid path_and_singleprint argument. Found no delimeter.");
  }
  std::string path = path_and_singleprint.substr(0, delimiter);
  if (path.empty()) {
    return absl::InvalidArgumentError(
        "Invalid path_and_singleprint argument. Empty path.");
  }
  std::string singleprint = path_and_singleprint.substr(delimiter + 1);
  if (singleprint.empty()) {
    return absl::InvalidArgumentError(