[Bug target/49263] SH Target: underutilized "TST #imm, R0" instruction

["kkojima at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49263

--- Comment #10 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2011-10-11 01:47:03 UTC ---
(In reply to comment #9)
> 3) only zero_extract special cases

looks to be dominant.

> I'm sorry, I forgot to mention that it was just a proof of concept hack
> of mine, just to see whether it has any chance to work at all.
> I think it would be better to change/fix the behavior of the combine pass
> in this regard, so that it tries matching combined patterns without
> sophisticated transformations. I will try asking on the gcc list about that.

I see.  I also expect that the experts have some idea for
this issue.

> I think it would be a bit too much checking out each individual pattern.

I don't think that it's too much.  Those numbers can be easily
collected for CSiBE.  If your patterns are named, you could
simply add "-dap -save-temps" to the compiler option which is
specified when ruining CSiBE's create-config and then get
the occurrences of testsi_6, for example, with something like
  grep "testsi_6" `find . -name "*.s" -print` | wc -l
after running the CSiBE size test.