Tatsuyuki Ishi 826f385348 [Support] Use find() for faster StringRef::count (NFC) ...

While profiling InclusionRewriter, it was found that counting lines was
so slow that it took up 20% of the processing time. Surely, calling
memcmp() of size 1 on every substring in the window isn't a good idea.

Use StringRef::find() instead; in the case of N=1 it will forward to
memcmp which is much more optimal. For 2<=N<256 it will run the same
memcmp loop as we have now, which is still suboptimal but at least does
not regress anything.

Differential Revision: https://reviews.llvm.org/D133658

2022-10-27 10:22:25 +02:00

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