------- Additional Comments From amylaar at gcc dot gnu dot org 2005-09-20 20:52 ------- (In reply to comment #3) > A regression hunt on i686-linux showed the failure starting with this patch > from [EMAIL PROTECTED]: > > http://gcc.gnu.org/ml/gcc-cvs/2005-05/msg00640.html
The i386.md x86_shrd_1 pattern is bogus, is should use lshiftrt, not ashiftrt. However, that is not the reason for this regression. The reason is that we have a bogus REG_NO_CONFLICT block. The generic rotate expander expects emit_no_conflict_block to re-order its instructions, but that is now suppresed by a match between clobbers of the flags register. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23837
