RISC-V: -mmax-vectorization.

This adds an -mmax-vectorization option to riscv, a verbatim copy from
aarch64.  It is an option for vector code analysis.  Internally it increases
scalar costs by a large factor so every vector approach will be
profitable.  As opposed to -fno-vect-cost-model, we will still compare
the vector approaches amongst each other, though.

In order to handle this argument without an '=' I needed to change the
parsing flow slightly.

gcc/ChangeLog:

	* config/riscv/riscv-target-attr.cc (riscv_target_attr_parser::handle_max_vect):
	New parser entry.
	(riscv_target_attr_parser::update_settings): Set max-vect
	option.
	(riscv_process_one_target_attr): Change null-arg handling.
	* config/riscv/riscv.cc (riscv_override_options_internal): Set
	max-vect option.
	* config/riscv/riscv.opt: Add -mmax-vectorization option.
	* doc/extend.texi: Document new option.
	* doc/invoke.texi: Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/max-vect-1.c: New test.
	* gcc.target/riscv/rvv/autovec/max-vect-2.c: New test.

0 files changed, 0 insertions, 0 deletions