http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54089
Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |amylaar at gcc dot gnu.org --- Comment #22 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> 2012-10-16 10:52:46 UTC --- (In reply to comment #0) > The code related to shift patterns in sh.c / sh.md maybe could use some > improvements here and there. In some places clobbers and scratch regs could > be > avoided. > There is also a large part that deals with minimizing and-shift/shift-and > sequences, but there are no test cases to verify that those actually work. > It would also be interesting to see, whether some of the and-shift/shift-and > combine code could be reduced due to improvements in the middle-end. Be careful with removing 'useless' clobbers, as they might be needed to facilitate instruction combinations into patterns that have these clobbers.