r256136 - in /trunk/gcc: ChangeLog tree-vect-st...

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Wed Jan  3 07:16:06 2018
New Revision: 256136

URL: https://gcc.gnu.org/viewcvs?rev=256136&root=gcc&view=rev
Log:
poly_int: vectorizable_load/store

This patch makes vectorizable_load and vectorizable_store cope with
variable-length vectors.  The reverse and permute cases will be
excluded by the code that checks the permutation mask (although a
patch after the main SVE submission adds support for the reversed
case).  Here we also need to exclude VMAT_ELEMENTWISE and
VMAT_STRIDED_SLP, which split the operation up into a constant
number of constant-sized operations.  We also don't try to extend
the current widening gather/scatter support to variable-length
vectors, since SVE uses a different approach.

2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* tree-vect-stmts.c (get_load_store_type): Treat the number of
	units as polynomial.  Reject VMAT_ELEMENTWISE and VMAT_STRIDED_SLP
	for variable-length vectors.
	(vectorizable_mask_load_store): Treat the number of units as
	polynomial, asserting that it is constant if the condition has
	already been enforced.
	(vectorizable_store, vectorizable_load): Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-vect-stmts.c