r263124 - in /trunk/gcc: ChangeLog tree-vect-lo...

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Tue Jul 31 14:21:51 2018
New Revision: 263124

URL: https://gcc.gnu.org/viewcvs?rev=263124&root=gcc&view=rev
Log:
[09/46] Add vec_info::lookup_single_use

This patch adds a helper function for seeing whether there is a single
user of an SSA name, and whether that user has a stmt_vec_info.

2018-07-31  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-vectorizer.h (vec_info::lookup_single_use): Declare.
	* tree-vectorizer.c (vec_info::lookup_single_use): New function.
	* tree-vect-loop.c (vectorizable_reduction): Use it instead of
	a single_imm_use-based sequence.
	* tree-vect-stmts.c (supportable_widening_operation): Likewise.

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