tree 34750cd8159bdb19b60181165699d29cd99f9537
parent 1dee25f723ef2e48076d3fedff3cb95d9d27e753
author birenroy <birenroy@google.com> 1706123460 -0800
committer Copybara-Service <copybara-worker@google.com> 1706123536 -0800

Uses constexpr to improve header validation code generation. Thank you to ricea@google.com for the suggestion!

```
$ benchy --perflab --reference=srcfs //third_party/http2/adapter:header_validator_benchmark

(Generated by http://go/benchy. Settings: --runs 5 --reference "srcfs" --perflab)

name                                  old cpu/op   new cpu/op   delta
BM_ValidateSingleHeaderForRequests    527ns ± 3%   408ns ± 1%  -22.64%  (p=0.016 n=5+4)
BM_ValidateSingleHeaderForResponses   818ns ±17%   628ns ± 3%  -23.23%  (p=0.008 n=5+5)

name                                  old time/op             new time/op             delta
BM_ValidateSingleHeaderForRequests    528ns ± 3%              409ns ± 1%  -22.65%          (p=0.016 n=5+4)
BM_ValidateSingleHeaderForResponses   821ns ±17%              630ns ± 3%  -23.28%          (p=0.008 n=5+5)

name                                  old INSTRUCTIONS/op     new INSTRUCTIONS/op     delta
BM_ValidateSingleHeaderForRequests    5.75k ± 0%              4.69k ± 0%  -18.50%          (p=0.008 n=5+5)
BM_ValidateSingleHeaderForResponses   8.21k ± 0%              6.72k ± 0%  -18.19%          (p=0.008 n=5+5)

name                                  old CYCLES/op           new CYCLES/op           delta
BM_ValidateSingleHeaderForRequests    1.73k ± 0%              1.32k ± 1%  -23.81%          (p=0.008 n=5+5)
BM_ValidateSingleHeaderForResponses   2.59k ± 1%              2.01k ± 0%  -22.42%          (p=0.008 n=5+5)

name                                  old allocs/op           new allocs/op           delta
BM_ValidateSingleHeaderForResponses    1.00 ± 0%               1.00 ± 0%     ~     (all samples are equal)

name                                  old peak-mem(Bytes)/op  new peak-mem(Bytes)/op  delta
BM_ValidateSingleHeaderForResponses    32.0 ± 0%               32.0 ± 0%     ~     (all samples are equal)

Results uploaded to http://sponge2/818994d8-6ad4-4dce-ad8f-42319ec5f962
```

PiperOrigin-RevId: 601176797