[PATCH v2 0/3] RISC-V: Support zfinx extension

[jiawei]

Zfinx extension[1] had already finished public review. Here is the implementation patch set that reuse floating point pattern and ban the use of fpr when use zfinx as a target.

Current works can be find in follow links, we will keep update zhinx and zhinxmin after zfh extension goes upstream.
  https://github.com/pz9115/riscv-gcc/tree/zfinx-rebase
  https://github.com/pz9115/riscv-binutils-gdb/tree/zfinx-rebase

For test you can use qemu or spike that support zfinx extension, the
qemu will go upstream soon and spike is still in review:
  https://github.com/plctlab/plct-qemu/tree/plct-zfinx-dev
  https://github.com/plctlab/plct-spike/tree/plct-upstream-zfinx  

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.

jiawei (3):
  RISC-V: Minimal support of zfinx extension
  RISC-V: Target support for zfinx extension
  RISC-V: Limit regs use  for zfinx extension

 gcc/common/config/riscv/riscv-common.c |  7 +++
 gcc/config/riscv/arch-canonicalize     |  1 +
 gcc/config/riscv/constraints.md        |  3 +-
 gcc/config/riscv/riscv-builtins.c      |  4 +-
 gcc/config/riscv/riscv-c.c             |  2 +-
 gcc/config/riscv/riscv-opts.h          |  6 +++
 gcc/config/riscv/riscv.c               | 14 ++++-
 gcc/config/riscv/riscv.md              | 72 +++++++++++++-------------
 gcc/config/riscv/riscv.opt             |  3 ++
 9 files changed, 71 insertions(+), 41 deletions(-)

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2.25.1