[Bug target/27077] [x86, 4.1] builtin strlen poor performance

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=27077

Thomas Koenig <tkoenig at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |WAITING
   Last reconfirmed|                            |2016-09-26
                 CC|                            |tkoenig at gcc dot gnu.org
         Resolution|INVALID                     |---
     Ever confirmed|0                           |1

--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Helmut Schellong from comment #6)
> gcc 6.2
> .......
> builtin strlen: 137.787 ns
> libc    strlen:  12.562 ns   (-fno-builtin-strlen)
> About 12 times faster!
> See table below.

In general, it is better to write a new bug report than to
reopen a 10-year old one.

Can you provide

- your test case, including the test harness

- Architecture (which CPU are you running this on, exactly)

- Which version of gcc you are reporting against

- The assembly output (with -S)