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[Bug rtl-optimization/23837] [4.0/4.1 regression] Wrong code with -fschedule-insns

------- 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 amylaar@gcc.gnu.org:
>   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.



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