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ircd::json: Reduce branch mispredictions in linear_any alternative parser.

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This commit is contained in:
Jason Volk 2020-05-13 00:20:57 -07:00
parent 8b3cc178ae
commit a2f6acd73f
1 changed files with 20 additions and 14 deletions
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34
ircd/json.cc
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@ -181,7 +181,13 @@ ircd::json::input
// primary recursive rule
rule<unused_type(uint)> value
{
string | number | lit_true | lit_false | lit_null | object(depth + 1) | array(depth + 1)
(&quote >> string)
| (&object_begin >> object(depth + 1))
| (&array_begin >> array(depth + 1))
| number
| lit_true
| lit_false
| lit_null
,"value"
};
@ -198,11 +204,11 @@ ircd::json::input
rule<enum json::type> type_strict
{
(omit[string] >> attr(json::STRING)) |
(omit[object(0)] >> attr(json::OBJECT)) |
(omit[array(0)] >> attr(json::ARRAY)) |
(omit[number] >> attr(json::NUMBER)) |
(omit[literal] >> attr(json::LITERAL))
(omit[&quote >> string] >> attr(json::STRING)) |
(omit[&object_begin >> object(0)] >> attr(json::OBJECT)) |
(omit[&array_begin >> array(0)] >> attr(json::ARRAY)) |
(omit[number] >> attr(json::NUMBER)) |
(omit[literal] >> attr(json::LITERAL))
,"type"
};
@ -210,14 +216,14 @@ ircd::json::input
:input::base_type{rule<>{}} // required by spirit
{
// synthesized repropagation of recursive rules
value %= string
| number
| lit_true
| lit_false
| lit_null
| object(depth + 1)
| array(depth + 1)
;
value %= (&quote >> string)
| (&object_begin >> object(depth + 1))
| (&array_begin >> array(depth + 1))
| number
| lit_true
| lit_false
| lit_null
;
}
};