Commits on Oct 9, 2024

1. arm: Implement SVE2 str2int …

   This patch implements a SVE2 version of str2int which improves
   number decoding on ARM SVE2 CPUs.
   
   The algorithm utilizes SVMATCH to count valid digits in the string, and SDOT
   for calculating the value. With this change the naive byte-by-byte method for ARM
   is substituted.
   
   Enable it by compiling with adding cmake option "-DENABLE_SVE2_128=ON".
   
   | Benchmark                      | Original     | SVE2       | Improvement |
   |--------------------------------|--------------|------------|-------------|
   | testdata/gsoc-2018.json        | 3406307500   | 3407847500 | 0.05%       |
   | testdata/twitter.json          | 2040162500   | 2039502500 | -0.03%      |
   | testdata/fgo.json              | 992470750    | 988730000  | -0.38%      |
   | testdata/citm_catalog.json     | 2209855000   | 2205997500 | -0.17%      |
   | testdata/twitterescaped.json   | 1767812500   | 1814302500 | 2.63%       |
   | testdata/github_events.json    | 2142690000   | 2147452500 | 0.22%       |
   | testdata/lottie.json           | 625985250    | 602068500  | -3.82%      |
   | testdata/poet.json             | 2867745000   | 2880562500 | 0.45%       |
   | testdata/otfcc.json            | 685481500    | 683760750  | -0.25%      |
   | testdata/book.json             | 687309000    | 674716000  | -1.83%      |
   | testdata/canada.json           | 775475000    | 1051945000 | 35.65%      |
   
   Signed-off-by: Yuzhong Wen <yuwen@nvidia.com>

   

   supermartian committed Oct 9, 2024
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