commit 8552dcd8e4448c02fe230662093756b75dd94399
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date: Thu Sep 28 11:53:51 2023 -0400
Revert "[RA]: Improve cost calculation of pseudos with equivalences"
This reverts commit 3c834d85f2ec42c60995c2b678196a06cb744959.
Although the patch improves x86-64 specfp2007, it also results in
performance and code size regression on different targets and
new GCC testsuite failures on tests expecting a specific output.
@@ -1947,8 +1947,15 @@ find_costs_and_classes (FILE *dump_file)
}
if (i >= first_moveable_pseudo && i < last_moveable_pseudo)
i_mem_cost = 0;
- else
- i_mem_cost -= equiv_savings;
+ else if (equiv_savings < 0)
+ i_mem_cost = -equiv_savings;
+ else if (equiv_savings > 0)
+ {
+ i_mem_cost = 0;
+ for (k = cost_classes_ptr->num - 1; k >= 0; k--)
+ i_costs[k] += equiv_savings;
+ }
+
best_cost = (1 << (HOST_BITS_PER_INT - 2)) - 1;
best = ALL_REGS;
alt_class = NO_REGS;