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Reduce branching in write_padded

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This commit is contained in:
Victor Zverovich 2020-04-29 18:33:14 -07:00
parent 9ac1eebd47
commit 3e69847616
2 changed files with 8 additions and 13 deletions
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2
include/fmt/format-inl.h
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@ -323,6 +323,8 @@ const char basic_data<T>::background_color[] = "\x1b[48;2;";
template <typename T> const char basic_data<T>::reset_color[] = "\x1b[0m";
template <typename T> const wchar_t basic_data<T>::wreset_color[] = L"\x1b[0m";
template <typename T> const char basic_data<T>::signs[] = {0, '-', '+', ' '};
template <typename T>
const char basic_data<T>::padding_shifts[] = {31, 31, 0, 1, 0};
template <typename T> struct bits {
static FMT_CONSTEXPR_DECL const int value =

19
include/fmt/format.h
View File

@ -776,6 +776,7 @@ template <typename T = void> struct FMT_EXTERN_TEMPLATE_API basic_data {
static const char reset_color[5];
static const wchar_t wreset_color[5];
static const char signs[];
static const char padding_shifts[5];
};
FMT_EXTERN template struct basic_data<void>;
@ -1598,15 +1599,9 @@ template <typename Range> class basic_writer {
template <typename F>
void write_padded(const format_specs& specs, size_t size, size_t width,
const F& f) {
size_t padding = 0;
size_t left_padding = 0;
if (unsigned spec_width = to_unsigned(specs.width)) {
padding = spec_width > width ? spec_width - width : 0;
if (specs.align == align::right)
left_padding = padding;
else if (specs.align == align::center)
left_padding = padding / 2;
}
unsigned spec_width = to_unsigned(specs.width);
size_t padding = spec_width > width ? spec_width - width : 0;
size_t left_padding = padding >> data::padding_shifts[specs.align];
auto&& it = reserve(size + padding * specs.fill.size());
it = fill(it, left_padding, specs.fill);
// Dummy check to workaround a bug in MSVC2017.
@ -1639,9 +1634,7 @@ template <typename Range> class basic_writer {
template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
void write(T value, format_specs specs = {}) {
if (const_check(!is_supported_floating_point(value))) {
return;
}
if (const_check(!is_supported_floating_point(value))) return;
float_specs fspecs = parse_float_type_spec(specs);
fspecs.sign = specs.sign;
if (std::signbit(value)) { // value < 0 is false for NaN so use signbit.
@ -1876,7 +1869,7 @@ class arg_formatter_base {
void on_int() {
if (formatter.specs_)
formatter.writer_.write_int(value, *formatter.specs_);
formatter.writer_.write_int(static_cast<int>(value), *formatter.specs_);
else
formatter.writer_.write(value);
}