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Make utf8_length_from_utf32 branchless. #489

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Make utf8_length_from_utf32 branchless. #489

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20 changes: 4 additions & 16 deletions src/ada_idna.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -109,22 +109,10 @@ size_t utf8_length_from_utf32(const char32_t* buf, size_t len) {
const uint32_t* p = reinterpret_cast<const uint32_t*>(buf);
size_t counter{0};
for (size_t i = 0; i < len; i++) {
/** ASCII **/
if (p[i] <= 0x7F) {
counter++;
}
/** two-byte **/
else if (p[i] <= 0x7FF) {
counter += 2;
}
/** three-byte **/
else if (p[i] <= 0xFFFF) {
counter += 3;
}
/** four-bytes **/
else {
counter += 4;
}
++counter; // ASCII
counter += static_cast<size_t>(p[i] > 0x7F); // two-byte
counter += static_cast<size_t>(p[i] > 0x7FF); // three-byte
counter += static_cast<size_t>(p[i] > 0xFFFF); // four-bytes
}
return counter;
}
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