Removed duplicate static table from hpack table. Removed an or instruction for
every usage of static grpc metadata. Inlined hpack table lookups for static
metadata.
This leads to faster hpack parser creation:
BM_HpackParserInitDestroy 5.32µs ± 1% 0.06µs ± 1% -98.91% (p=0.000 n=18+19)
And slightly faster parsing:
BM_HpackParserParseHeader<RepresentativeClientInitialMetadata, OnInitialHeader>
456ns ± 1% 435ns ± 1% -4.74% (p=0.000 n=18+19)
BM_HpackParserParseHeader<MoreRepresentativeClientInitialMetadata,
OnInitialHeader>
1.06µs ± 2% 1.04µs ± 2% -1.82% (p=0.000 n=19+20)
It also yields a slight (0.5 - 1.0 microsecond) reduction in CPU time for
fullstack unary pingpong:
BM_UnaryPingPong<TCP, NoOpMutator, NoOpMutator>/0/512
[polls/iter:3.0001 ] 23.9µs ± 2%
23.0µs ± 1% -3.63% (p=0.002 n=6+6)
BM_UnaryPingPong<TCP, NoOpMutator, NoOpMutator>/0/32768
[polls/iter:3.00015 ] 35.1µs ± 1%
34.2µs ± 1% -2.57% (p=0.036 n=5+3)
BM_UnaryPingPong<MinTCP, NoOpMutator, NoOpMutator>/8/0
[polls/iter:3.00011 ] 21.7µs ± 3%
21.2µs ± 2% -2.44% (p=0.017 n=6+5)
b1d73a01f1