J. Nick Koston e285fd6815 [api] Inline ProtoVarInt::parse fast path and return consumed in struct ...

Replace optional<ProtoVarInt> + consumed pointer with ProtoVarIntResult
struct that returns value + consumed count directly. This eliminates
memory stores through a pointer on the fast path (single-byte varints
< 128), keeping everything in registers.

The parse() method is now ESPHOME_ALWAYS_INLINE with the multi-byte
slow path outlined to parse_slow_(). The common case for protobuf
field tags, small enums, booleans, and typical message sizes/types
is a simple high-bit check + register return with no function call.

Measured on ESP32 (Xtensa): try_read_frame_ grows only +12 bytes
(320 → 332) for two inlined parse sites, while eliminating two
function calls per message on the hot path.

2026-03-08 17:13:03 -10:00

..

api_protobuf.py

[api] Inline ProtoVarInt::parse fast path and return consumed in struct

2026-03-08 17:13:03 -10:00