[Bug target/61142] [SH] QImode/HImode @(R0,Rm),Rn does not load to Rn = R0

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61142

--- Comment #4 from Oleg Endo <olegendo at gcc dot gnu.org> ---
Created attachment 34839
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34839&action=edit
A set of peepholes

This is a set of peepholes I have accumulated, although untested.
With the patch CSiBE (-O2 -m4-single -mpretend-cmove) shows the following
summary:

sum:  3371887 -> 3367967    -3920 / -0.116255 %
avg: -217.777778 / -0.167780 %
max: replaypc-0.4.0.preproc   57212 -> 57188          -24 / -0.041949 %
min: mpeg2dec-0.3.1           54348 -> 53984         -364 / -0.669758 %