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The Neon multiply/multiply-accumulate/multiply-subtract instructions can take various forms - multiplying full vector registers of values or multiplying one vector by a single element of another. Regardless of the form used, these instructions have the same cost, and this should be reflected by the RTL cost function. This patch adds RTL tree traversal in the Neon multiply cost function to match the vec_select used by the lane-referencing forms of the instructions already mentioned. This traversal prevents the cost of the vec_select from being added into the cost of the multiply - meaning that these instructions can now be emitted in the combine pass as they are no longer deemed prohibitively expensive. gcc/ChangeLog: 2021-07-19 Jonathan Wright <jonathan.wright@arm.com> * config/aarch64/aarch64.c (aarch64_strip_duplicate_vec_elt): Define. (aarch64_rtx_mult_cost): Traverse RTL tree to prevent vec_select cost from being added into Neon multiply cost. gcc/testsuite/ChangeLog: * gcc.target/aarch64/vmul_element_cost.c: New test. |
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This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.