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Use the faster bit interleave for encode_quadkey itself

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encode_vertex() computed exactly the same thing as encode_quadkey(),
so there is no reason to have both. Give encode_quadkey() the branch-free
implementation, which also speeds up the default encode_index, and have
the shared node code call it directly. The unit test now compares it
against the old bit-at-a-time loop and checks that decode_quadkey()
reverses it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01P2nBqZisxNQfmEmon3vE9v
This commit is contained in:
Claude
2026-09-23 20:02:49 +00:00
parent e1795ebe32
commit 58ad6e3008
6 changed files with 39 additions and 36 deletions
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projection.hpp
-1
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@@ -26,6 +26,5 @@ void decode_quadkey(unsigned long long index, unsigned *wx, unsigned *wy);
unsigned long long encode_hilbert(unsigned int wx, unsigned int wy);
void decode_hilbert(unsigned long long index, unsigned *wx, unsigned *wy);
unsigned long long encode_vertex(unsigned int wx, unsigned int wy);
#endif