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rs6000: Guard density_test only for vector version

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This patch teaches rs6000_density_test to only care about the vector
version cost calculation and early return when calculating the single
scalar iteration cost.

Bootstrapped/regtested on powerpc64le-linux-gnu P9.

gcc/ChangeLog:

	* config/rs6000/rs6000.c (struct rs6000_cost_data): New member
	costing_for_scalar.
	(rs6000_density_test): Early return if costing_for_scalar is true.
	(rs6000_init_cost): Init costing_for_scalar of rs6000_cost_data.
This commit is contained in:
Kewen Lin 2021-05-10 23:01:15 -05:00
parent 096f8215d2
commit 1866182f6c
1 changed files with 10 additions and 1 deletions
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11
gcc/config/rs6000/rs6000.c
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@ -5238,6 +5238,8 @@ typedef struct _rs6000_cost_data
/* For each vectorized loop, this var holds TRUE iff a non-memory vector
instruction is needed by the vectorization. */
bool vect_nonmem;
/* Indicates this is costing for the scalar version of a loop or block. */
bool costing_for_scalar;
} rs6000_cost_data;
/* Test for likely overcommitment of vector hardware resources. If a
@ -5259,6 +5261,12 @@ rs6000_density_test (rs6000_cost_data *data)
int vec_cost = data->cost[vect_body], not_vec_cost = 0;
int i, density_pct;
/* This density test only cares about the cost of vector version of the
loop, so immediately return if we are passed costing for the scalar
version (namely computing single scalar iteration cost). */
if (data->costing_for_scalar)
return;
for (i = 0; i < nbbs; i++)
{
basic_block bb = bbs[i];
@ -5296,7 +5304,7 @@ rs6000_density_test (rs6000_cost_data *data)
/* Implement targetm.vectorize.init_cost. */
static void *
rs6000_init_cost (struct loop *loop_info, bool)
rs6000_init_cost (struct loop *loop_info, bool costing_for_scalar)
{
rs6000_cost_data *data = XNEW (struct _rs6000_cost_data);
data->loop_info = loop_info;
@ -5304,6 +5312,7 @@ rs6000_init_cost (struct loop *loop_info, bool)
data->cost[vect_body] = 0;
data->cost[vect_epilogue] = 0;
data->vect_nonmem = false;
data->costing_for_scalar = costing_for_scalar;
return data;
}