[Bug rtl-optimization/106553] pre-register allocation scheduler is now RMW aware

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106553

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |amonakov at gcc dot gnu.org

--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Are you sure the testcase is correctly reduced, i.e. does it show the same
performance degradation? Latency-wise the scheduler is making the correct
decision here: we really want to schedule second-to-last FMA

  y = v_fma_f32 (y, r2, x);

earlier than its predecessor

  r = v_fma_f32 (y, r2, z);

because we need to compute y*r2 before the last FMA.