J. Nick Koston d8e586609f [core] Optimize value_accuracy_to_buf to avoid snprintf ...

Replace snprintf("%.*f") with integer-based formatting for finite
float values with accuracy_decimals 0-3 (covers virtually all sensor
usage). Falls back to snprintf for higher accuracy or NaN/Inf.

Uses lrint() with double cast for the multiply to match snprintf's
rounding behavior exactly. The fast path avoids snprintf's heavy
float formatting machinery entirely.

Also optimizes value_accuracy_with_uom_to_buf to append the UOM
string directly instead of going through snprintf.

Adds C++ unit tests that verify output matches snprintf for a range
of values including edge cases.

Benchmark: 92,961ns -> 6,484ns (14.3x faster, 2000 iterations).

2026-04-08 20:46:16 -10:00

..

__init__.py

[core] cpp tests: Allow customizing code generation during tests (#14681)

2026-03-18 00:16:01 +00:00

test_value_accuracy.cpp

[core] Optimize value_accuracy_to_buf to avoid snprintf

2026-04-08 20:46:16 -10:00