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J. Nick Koston
bcf812d62b
CodSpeed showed the single virtual costing 7 to 18 percent on the decode benchmarks. The x86-64 disassembly pointed at the call, not the switch: passing the field number and wire type alongside the tag plus a 16 byte union payload kept five values live across the call, so the compiler spilled this, the end pointer and half of the payload to the stack and reloaded them for every field. decode_field() now takes only the tag, the payload pointer (already the loop cursor) and one scalar that holds the varint or fixed32 value or the payload length. The generated override wraps them in a ProtoFieldValue that never exists in memory. On the host the switch key is the field number derived with one shift and the guard compares the whole tag against the constant the case declares, which is the same two instructions the old per wire type dispatch cost. The loop also handles single byte varints inline instead of going through the parse result struct, which drops the materialized consumed count and its add on every tag and small value.
Tests for ESPHome
This directory contains some tests for ESPHome.
At the moment, all the tests only work by simply executing
esphome over some YAML files that are made to test
whether the yaml gets converted to the proper C++ code.
Of course this is all just very high-level and things like unit tests would be much better. So if you have time and know how to set up a unit testing framework for python, please do give it a try.
When adding entries in test_.yaml files we usually need only
one file updated, unless conflicting code is generated for
different configurations, e.g. wifi and ethernet cannot
be tested on the same device.
Current test_.yaml file contents.
| Test name | Platform | Network | BLE |
|---|---|---|---|
| test1.yaml | ESP32 | wifi | None |
| test2.yaml | ESP32 | ethernet | esp32_ble_tracker |
| test3.yaml | ESP8266 | wifi | N/A |
| test4.yaml | ESP32 | ethernet | None |
| test5.yaml | ESP32 | wifi | ble_server |
| test6.yaml | RP2040 | wifi | N/A |
| test7.yaml | ESP32-C3 | wifi | N/A |
| test8.yaml | ESP32-S3 | wifi | None |
| test10.yaml | ESP32 | wifi | None |