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tree-optimization/102847 - properly cost VMAT_INVARIANT loads

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The following adds proper costing of VMAT_INVARIANT loads, avoiding
to ask the target about the cost of an unsupported vector load cost
which we won't emit anyway.

2021-10-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/102847
	* tree-vect-stmts.c (vect_model_load_cost): Explicitely
	handle VMAT_INVARIANT as a splat in the prologue.
This commit is contained in:
Richard Biener 2021-10-21 10:24:03 +02:00
parent e633f82fb7
commit 7878981f1d
1 changed files with 7 additions and 0 deletions
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7
gcc/tree-vect-stmts.c
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@ -1191,6 +1191,13 @@ vect_model_load_cost (vec_info *vinfo,
ncopies * assumed_nunits,
scalar_load, stmt_info, 0, vect_body);
}
else if (memory_access_type == VMAT_INVARIANT)
{
/* Invariant loads will ideally be hoisted and splat to a vector. */
prologue_cost += record_stmt_cost (cost_vec, 1,
scalar_to_vec, stmt_info, 0,
vect_prologue);
}
else
vect_get_load_cost (vinfo, stmt_info, ncopies,
alignment_support_scheme, misalignment, first_stmt_p,