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vec: Revert "dead code removal in tree-vect-loop.c" and add a comment.

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gcc/ChangeLog

2020-09-07  Andrea Corallo  <andrea.corallo@arm.com>

	* tree-vect-loop.c (vect_estimate_min_profitable_iters): Revert
	dead-code removal introduced by 09fa6acd8d + add a comment to
	clarify.
This commit is contained in:
Andrea Corallo 2020-09-07 13:45:47 +01:00
parent 016b190036
commit e147bb0faa
1 changed files with 13 additions and 4 deletions
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17
gcc/tree-vect-loop.c
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@ -4089,6 +4089,8 @@ vect_estimate_min_profitable_iters (loop_vec_info loop_vinfo,
if (vec_outside_cost <= 0)
min_profitable_estimate = 0;
/* ??? This "else if" arm is written to handle all cases; see below for
what we would do for !LOOP_VINFO_USING_PARTIAL_VECTORS_P. */
else if (LOOP_VINFO_USING_PARTIAL_VECTORS_P (loop_vinfo))
{
/* This is a repeat of the code above, but with + SOC rather
@ -4101,10 +4103,17 @@ vect_estimate_min_profitable_iters (loop_vec_info loop_vinfo,
if (outside_overhead > 0)
min_vec_niters = outside_overhead / saving_per_viter + 1;
int threshold = (vec_inside_cost * min_vec_niters
+ vec_outside_cost
+ scalar_outside_cost);
min_profitable_estimate = threshold / scalar_single_iter_cost + 1;
if (LOOP_VINFO_USING_PARTIAL_VECTORS_P (loop_vinfo))
{
int threshold = (vec_inside_cost * min_vec_niters
+ vec_outside_cost
+ scalar_outside_cost);
min_profitable_estimate = threshold / scalar_single_iter_cost + 1;
}
else
min_profitable_estimate = (min_vec_niters * assumed_vf
+ peel_iters_prologue
+ peel_iters_epilogue);
}
else
{