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[api] Add 2-byte inline fast path for sint32 varint encode/size

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Add encode_varint_raw_short() and ProtoSize::varint_short() that
inline both the 1-byte and 2-byte varint paths, falling back to
the noinline slow path for 3+ bytes.

Use these for sint32 fields (zigzag encoding), where values like
RSSI (-100 to 0) produce zigzag values that are 1-2 bytes. This
avoids a function call for the common case without bloating the
generic encode_varint_raw fast path.
This commit is contained in:
J. Nick Koston
2026-03-28 17:27:40 -10:00
parent 777e162070
commit 52897fd067
3 changed files with 31 additions and 4 deletions
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script/api_protobuf/api_protobuf.py
+1 -1
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@@ -229,7 +229,7 @@ class TypeInfo(ABC):
RAW_ENCODE_MAP: dict[str, str] = {
"encode_uint32": "buffer.encode_varint_raw({value});",
"encode_uint64": "buffer.encode_varint_raw_64({value});",
"encode_sint32": "buffer.encode_varint_raw(encode_zigzag32({value}));",
"encode_sint32": "buffer.encode_varint_raw_short(encode_zigzag32({value}));",
"encode_sint64": "buffer.encode_varint_raw_64(encode_zigzag64({value}));",
"encode_int64": "buffer.encode_varint_raw_64(static_cast<uint64_t>({value}));",
"encode_bool": "buffer.write_raw_byte({value} ? 0x01 : 0x00);",