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Clean up bit fiddling for argument packing

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This commit is contained in:
Victor Zverovich 2018-11-30 15:48:09 -08:00
parent 9dcf127fa5
commit bcf3fcd673
2 changed files with 17 additions and 19 deletions
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33
include/fmt/core.h
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@ -765,6 +765,7 @@ FMT_CONSTEXPR11 typename std::enable_if<
// Maximum number of arguments with packed types.
enum { max_packed_args = 15 };
enum : unsigned long long { is_unpacked_bit = 1ull << 63 };
template <typename Context>
class arg_map;
@ -1150,17 +1151,17 @@ class format_arg_store {
friend class basic_format_args<Context>;
static FMT_CONSTEXPR11 long long get_types() {
static FMT_CONSTEXPR11 unsigned long long get_types() {
return IS_PACKED ?
static_cast<long long>(internal::get_types<Context, Args...>()) :
-static_cast<long long>(NUM_ARGS);
internal::get_types<Context, Args...>() :
internal::is_unpacked_bit | NUM_ARGS;
}
public:
#if FMT_USE_CONSTEXPR11
static FMT_CONSTEXPR11 long long TYPES = get_types();
static FMT_CONSTEXPR11 unsigned long long TYPES = get_types();
#else
static const long long TYPES;
static const unsigned long long TYPES;
#endif
#if (FMT_GCC_VERSION && FMT_GCC_VERSION <= 405) || \
@ -1179,7 +1180,8 @@ class format_arg_store {
#if !FMT_USE_CONSTEXPR11
template <typename Context, typename ...Args>
const long long format_arg_store<Context, Args...>::TYPES = get_types();
const unsigned long long format_arg_store<Context, Args...>::TYPES =
get_types();
#endif
/**
@ -1214,11 +1216,12 @@ class basic_format_args {
const format_arg *args_;
};
bool is_packed() const { return (types_ & internal::is_unpacked_bit) == 0; }
typename internal::type type(unsigned index) const {
unsigned shift = index * 4;
unsigned long long mask = 0xf;
return static_cast<typename internal::type>(
(types_ & (mask << shift)) >> shift);
(types_ & (0xfull << shift)) >> shift);
}
friend class internal::arg_map<Context>;
@ -1228,10 +1231,8 @@ class basic_format_args {
format_arg do_get(size_type index) const {
format_arg arg;
long long signed_types = static_cast<long long>(types_);
if (signed_types < 0) {
unsigned long long num_args =
static_cast<unsigned long long>(-signed_types);
if (!is_packed()) {
auto num_args = max_size();
if (index < num_args)
arg = args_[index];
return arg;
@ -1266,7 +1267,7 @@ class basic_format_args {
\endrst
*/
basic_format_args(const format_arg *args, size_type count)
: types_(-static_cast<int64_t>(count)) {
: types_(internal::is_unpacked_bit | count) {
set_data(args);
}
@ -1279,10 +1280,8 @@ class basic_format_args {
}
unsigned max_size() const {
long long signed_types = static_cast<long long>(types_);
return static_cast<unsigned>(
signed_types < 0 ?
-signed_types : static_cast<long long>(internal::max_packed_args));
unsigned long long max_packed = internal::max_packed_args;
return is_packed() ? max_packed : types_ & ~internal::is_unpacked_bit;
}
};

3
include/fmt/format.h
View File

@ -1364,8 +1364,7 @@ void arg_map<Context>::init(const basic_format_args<Context> &args) {
if (map_)
return;
map_ = new entry[args.max_size()];
bool use_values = args.type(max_packed_args - 1) == internal::none_type;
if (use_values) {
if (args.is_packed()) {
for (unsigned i = 0;/*nothing*/; ++i) {
internal::type arg_type = args.type(i);
switch (arg_type) {