[Bug 1793786] Re: libc6 2.27 lacks sse2 optimized strstr()

[Adam Conrad]

*** This bug is a duplicate of bug 1797335 ***
    https://bugs.launchpad.net/bugs/1797335

** This bug has been marked a duplicate of bug 1797335
   strstr() on ubuntu18.04 8 times slower than on ubuntu16

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https://bugs.launchpad.net/bugs/1793786

Title:
  libc6 2.27 lacks sse2 optimized strstr()

Status in glibc package in Ubuntu:
  New

Bug description:
  Looks like code using strstr() and libc-2.27 is running 4 times slower
  than was with libc-2.23. Having a look at profiled code executed in
  various moments show different versions of strstr :

  - libc-2.27.so: strstr.c, str-two-way.h - this is current version
  ubuntu 18.04.1

  Same code, profiled March 13, 2018 :

  - libc-2.23.so: strstr-sse2-unaligned.S

  Looks like the indirect function part of glibc is not working
  correctly : any test I can do to spot the problem ?

  Best
  -Paul

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