thodg/libgit2/src

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  • Hash : e99e833f
    Author : lhchavez
    Date : 2020-12-12T16:51:15 

    Make git__strntol64() ~70%* faster

This change uses compiler intrinsics to detect overflows instead of
using divisions to detect potential overflow. This makes the code faster
and makes it easier to read as a bonus side-effect!

Some of the things this quickens:

* Config parsing.
* Tree parsing.
* Smart protocol negotiation.

\* Measured by running `libgit2_clar` with `-fno-optimize-sibling-calls
-fno-omit-frame-pointer` under `perf(1)`:

```shell
$ perf diff --symbols=git__strntol64 --compute=ratio \
  --percentage=absolute baseline.data perf.data
\# Event 'cycles'
\#
\# Baseline           Ratio  Shared Object
\# ........  ..............  .............
\#
     0.25%        0.321836  libgit2_clar
```

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