On 25 Aug 2014, at 17:39, Taylor R Campbell <riastr...@netbsd.org> wrote:
> Date: Mon, 25 Aug 2014 15:55:53 +0200 > From: "J. Hannken-Illjes" <hann...@eis.cs.tu-bs.de> > > GCC 4.5.4 disabled builtin memcmp as x86 has no cmpmemsi pattern. > > See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052, Comment 16. > > Could this be the cause of this big loss in performance? > > Shouldn't be too hard to test this. Perhaps try dropping in the > following replacements for the vcache key comparison and running the > test for each one? > <memequal.c> We are talking about a kernel from 2012/09 -- vcache came much later. -- J. Hannken-Illjes - hann...@eis.cs.tu-bs.de - TU Braunschweig (Germany)
