[v4 PATCH 0/4] RISC-V: Support z*inx extensions.

[jiawei <jiawei@iscas.ac.cn>]

Zfinx extension[1] had already ratified. Here is the 
implementation patch set that reuse floating point pattern and ban
the use of fpr when use z*inx as a target.

Current works can be find in follow links, binutils and simulator 
works already supported on upstream.
  https://github.com/pz9115/riscv-gcc/tree/zfinx-rebase

Thanks for Tariq Kurd, Kito Cheng, Jim Willson, 
Jeremy Bennett helped us a lot with this work.

[1] https://github.com/riscv/riscv-zfinx/blob/main/zfinx-1.0.0-rc.pdf

Version log:

v2: As Kito Cheng's comment, add Changelog part in patches, update imply 
info in riscv-common.c, remove useless check and update annotation in 
riscv.c.

v3: Update with new isa-spec version 20191213, make zfinx imply zicsr as
default, fix the lack of fcsr use in zfinx.

v4: Rebase patch with upstream, add zhinx/zhinxmin extensions support.
Add additional zhinx/zhinxmin same like zfh/zfhmin.

Jiawei (4):
  RISC-V: Minimal support of z*inx extension.
  RISC-V: Target support for z*inx extension.
  RISC-V: Limit regs use for z*inx extension.
  RISC-V: Add zhinx/zhinxmin testcases.

 gcc/common/config/riscv/riscv-common.cc       | 18 +++++
 gcc/config/riscv/arch-canonicalize            |  5 ++
 gcc/config/riscv/constraints.md               |  5 +-
 gcc/config/riscv/iterators.md                 |  6 +-
 gcc/config/riscv/riscv-builtins.cc            |  4 +-
 gcc/config/riscv/riscv-c.cc                   |  2 +-
 gcc/config/riscv/riscv-opts.h                 | 10 +++
 gcc/config/riscv/riscv.cc                     | 21 ++++-
 gcc/config/riscv/riscv.md                     | 78 ++++++++++---------
 gcc/config/riscv/riscv.opt                    |  3 +
 .../gcc.target/riscv/_Float16-zhinx-1.c       | 10 +++
 .../gcc.target/riscv/_Float16-zhinx-2.c       |  9 +++
 .../gcc.target/riscv/_Float16-zhinx-3.c       |  9 +++
 .../gcc.target/riscv/_Float16-zhinxmin-1.c    | 10 +++
 .../gcc.target/riscv/_Float16-zhinxmin-2.c    | 10 +++
 .../gcc.target/riscv/_Float16-zhinxmin-3.c    | 10 +++
 16 files changed, 160 insertions(+), 50 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/riscv/_Float16-zhinx-1.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/_Float16-zhinx-2.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/_Float16-zhinx-3.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/_Float16-zhinxmin-1.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/_Float16-zhinxmin-2.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/_Float16-zhinxmin-3.c

-- 
2.25.1