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terminal: swap codepointwidth implementations

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This commit is contained in:
Mitchell Hashimoto
2024-02-07 09:38:17 -08:00
parent 3c31217f3c
commit 17dc64053e
3 changed files with 13 additions and 40 deletions
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14
src/simd/codepoint_width.cpp
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@@ -187,12 +187,15 @@ static_assert(std::size(eaw_gte) == std::size(eaw_lte));
static_assert(std::size(zero_gte) == std::size(zero_lte));
static_assert(std::size(nsm_gte) == std::size(nsm_lte));
/// Vectorized implementation of Unicode display width. Determining width
/// unfortunately requires many small range checks, so we test some fast paths
/// and otherwise try to do N (vector lane width) range checks at a time.
template <class D>
int8_t CodepointWidthImpl(D d, T input) {
// If the input is ASCII, then we return 1. We do NOT check for
// control characters because we assume that the input has already
// been checked for that case.
if (input < 0xFF) {
if (input <= 0xFF) {
return 1;
}
@@ -201,14 +204,6 @@ int8_t CodepointWidthImpl(D d, T input) {
const hn::Vec<D> input_vec = Set(d, input);
{
// Thes are the ranges (inclusive) of the codepoints that are DEFINITELY
// width 2. We will check as many in parallel as possible.
//
// The zero padding is so that we can always load aligned directly into
// a vector register of any size up to 16 bytes (AVX512).
//
// Ranges: two-em dash, gbp.isRegionalIndicator, CJK...
//
// NOTE: 0x2E3B is technically width 3 but for our terminal we only
// handle up to width 2 as wide so we will treat it as width 2.
HWY_ALIGN constexpr T gte_keys[] = {
@@ -233,7 +228,6 @@ int8_t CodepointWidthImpl(D d, T input) {
}
{
// Definitely width 0
HWY_ALIGN constexpr T gte_keys[] = {
0x1160, 0x2060, 0xFFF0, 0xE0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};