[SH] PR 54089 - adjust shift costs

[Kaz Kojima]

Oleg Endo <oleg.endo@t-online.de> wrote:
> This adjusts the cost calculations for shifts on SH.
> I tried out Richard's advice
> ( http://gcc.gnu.org/ml/gcc-patches/2012-07/msg01206.html )
> and it seems to work OK to just leave out the mentioned CONST_INT_P
> case.
> Tested on rev 189870 with
> make -k check RUNTESTFLAGS="--target_board=sh-sim
> \{-m2/-ml,-m2/-mb,-m2a/-mb,-m2a-single/-mb,-m4/-ml,-m4/-mb,-m4-single/-ml,
> -m4-single/-mb,-m4a-single/-ml,-m4a-single/-mb}"
> 
> and no new failures.
> I've also confirmed that the example function in
> tree-switch-conversion.c:184 now is transformed as expected.  The CSiBE
> set shows a few improvements here and there, where these kind of
> transformations can be applied for when dynamic shifts are available
> (SH3+).  For SH2 (no dynamic shifts) there also seem to be some minor
> improvements.
> 
> OK?

OK.

Regards,
	kaz