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On 21/07/23 3:43 pm, Surya Kumari Jangala via Gcc-patches wrote: > The improve_allocation() routine does not update the > allocated_hardreg_p[] array after an allocno is assigned a register. > > If the register chosen in improve_allocation() is one that already has > been assigned to a conflicting allocno, then allocated_hardreg_p[] > already has the corresponding bit set to TRUE, so nothing needs to be > done. > > But improve_allocation() can also choose a register that has not been > assigned to a conflicting allocno, and also has not been assigned to any > other allocno. In this case, allocated_hardreg_p[] has to be updated. > > 2023-07-21 Surya Kumari Jangala <jskum...@linux.ibm.com> > > gcc/ > PR rtl-optimization/PR110254 > * ira-color.cc (improve_allocation): Update array > --- > > diff --git a/gcc/ira-color.cc b/gcc/ira-color.cc > index 1fb2958bddd..5807d6d26f6 100644 > --- a/gcc/ira-color.cc > +++ b/gcc/ira-color.cc > @@ -3340,6 +3340,10 @@ improve_allocation (void) > } > /* Assign the best chosen hard register to A. */ > ALLOCNO_HARD_REGNO (a) = best; > + > + for (j = nregs - 1; j >= 0; j--) > + allocated_hardreg_p[best + j] = true; > + > if (internal_flag_ira_verbose > 2 && ira_dump_file != NULL) > fprintf (ira_dump_file, "Assigning %d to a%dr%d\n", > best, ALLOCNO_NUM (a), ALLOCNO_REGNO (a));
