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rtl-optimization/110587 - speedup find_hard_regno_for_1

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The following applies a micro-optimization to find_hard_regno_for_1,
re-ordering the check so we can easily jump-thread by using an else.
This reduces the time spent in this function by 15% for the testcase
in the PR.

	PR rtl-optimization/110587
	* lra-assigns.cc (find_hard_regno_for_1): Re-order checks.
This commit is contained in:
Richard Biener 2023-07-25 15:36:30 +02:00
parent 0412f0e374
commit b66e613a1a
1 changed files with 5 additions and 4 deletions
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9
gcc/lra-assigns.cc
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@ -522,14 +522,15 @@ find_hard_regno_for_1 (int regno, int *cost, int try_only_hard_regno,
r2 != NULL;
r2 = r2->start_next)
{
if (r2->regno >= lra_constraint_new_regno_start
if (live_pseudos_reg_renumber[r2->regno] < 0
&& r2->regno >= lra_constraint_new_regno_start
&& lra_reg_info[r2->regno].preferred_hard_regno1 >= 0
&& live_pseudos_reg_renumber[r2->regno] < 0
&& rclass_intersect_p[regno_allocno_class_array[r2->regno]])
sparseset_set_bit (conflict_reload_and_inheritance_pseudos,
r2->regno);
if (live_pseudos_reg_renumber[r2->regno] >= 0
&& rclass_intersect_p[regno_allocno_class_array[r2->regno]])
else if (live_pseudos_reg_renumber[r2->regno] >= 0
&& rclass_intersect_p
[regno_allocno_class_array[r2->regno]])
sparseset_set_bit (live_range_hard_reg_pseudos, r2->regno);
}
}