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Re: performance bug of `wc -m` on glibc systems

From: Bruno Haible
Subject: Re: performance bug of `wc -m` on glibc systems
Date: Mon, 21 May 2018 20:01:09 +0200
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With the proposed function-pointer-factory changes, I'm seeing
this speedup on glibc systems:

             num     mbc
  Before    0.056   0.152
  After     0.057   0.089
  Speedup    1.0     1.7

Find attached the profiling result.

What you can see:
  - The glibc-compatible rewrite of UTF-8 mbrtowc is about 4.5 times faster
    than the glibc implementation.
  - The glibc wcwidth and the gnulib uc_width are approximately on par,
    regarding speed. uc_width is probably slightly slower, but not


Attachment: callgrind.out.11605.png
Description: application/kcachegrind

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