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We branch on GCC for performance. (#1913)

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This commit is contained in:
Daniel Lemire
2022-10-16 13:15:35 -04:00
committed by GitHub
parent 960a7ebba1
commit 4bd66cb891
1 changed files with 57 additions and 0 deletions
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benchmark/json2msgpack/simdjson_ondemand.h
+57
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@@ -51,6 +51,7 @@ private:
simdjson_inline void
write_raw_string(simdjson::ondemand::raw_json_string rjs);
inline void recursive_processor(simdjson::ondemand::value element);
inline void recursive_processor_ref(simdjson::ondemand::value& element);
simdjson::ondemand::parser parser;
uint8_t *buff{};
@@ -88,7 +89,16 @@ simdjson2msgpack::to_msgpack(const simdjson::padded_string &json,
}
} else {
simdjson::ondemand::value val = doc;
#define SIMDJSON_GCC_COMPILER ((__GNUC__) && !(__clang__) && !(__INTEL_COMPILER))
#if SIMDJSON_GCC_COMPILER
// the GCC compiler does well with by-value passing.
// GCC has superior recursive inlining:
// https://stackoverflow.com/questions/29186186/why-does-gcc-generate-a-faster-program-than-clang-in-this-recursive-fibonacci-co
// https://godbolt.org/z/TeK4doE51
recursive_processor(val);
#else
recursive_processor_ref(val);
#endif
}
if (doc.current_location().error() == simdjson::SUCCESS) {
// Example of error detection - this won't be reached on twitter.json in the benchmark.
@@ -175,6 +185,53 @@ void simdjson2msgpack::recursive_processor(simdjson::ondemand::value element) {
}
}
void simdjson2msgpack::recursive_processor_ref(simdjson::ondemand::value& element) {
switch (element.type()) {
case simdjson::ondemand::json_type::array: {
uint32_t counter = 0;
write_byte(0xdd);
uint8_t *location = skip_uint32();
for (auto child : element.get_array()) {
counter++;
simdjson::ondemand::value v = child.value();
recursive_processor_ref(v);
}
write_uint32_at(counter, location);
} break;
case simdjson::ondemand::json_type::object: {
uint32_t counter = 0;
write_byte(0xdf);
uint8_t *location = skip_uint32();
for (auto field : element.get_object()) {
counter++;
write_raw_string(field.key());
simdjson::ondemand::value v = field.value();
recursive_processor_ref(v);
}
write_uint32_at(counter, location);
} break;
case simdjson::ondemand::json_type::number:
write_double(element.get_double());
break;
case simdjson::ondemand::json_type::string:
write_raw_string(element.get_raw_json_string());
break;
case simdjson::ondemand::json_type::boolean:
write_byte(0xc2 + element.get_bool());
break;
case simdjson::ondemand::json_type::null:
// We check that the value is indeed null
// otherwise: an error is thrown.
if(element.is_null()) {
write_byte(0xc0);
}
break;
default:
SIMDJSON_UNREACHABLE();
}
}
struct simdjson_ondemand {
using StringType = std::string_view;