From: Frank Chang <frank.chang@sifive.com>

This patchset implements RISC-V B-extension latest draft version
(2020.10.26) Zbb, Zbs and Zba subset instructions.

Specification:
https://github.com/riscv/riscv-bitmanip/blob/master/bitmanip-draft.pdf

The port is available here:
https://github.com/sifive/qemu/tree/rvb-upstream-v1

To test rvb implementation, specify cpu argument with 'x-b=true' to
enable B-extension support.


Frank Chang (2):
  target/riscv: rvb: generalized reverse
  target/riscv: rvb: generalized or-combine

Kito Cheng (13):
  target/riscv: reformat @sh format encoding for B-extension
  target/riscv: rvb: count leading/trailing zeros
  target/riscv: rvb: count bits set
  target/riscv: rvb: logic-with-negate
  target/riscv: rvb: pack two words into one register
  target/riscv: rvb: min/max instructions
  target/riscv: rvb: sign-extend instructions
  target/riscv: rvb: single-bit instructions
  target/riscv: rvb: shift ones
  target/riscv: rvb: rotate (left/right)
  target/riscv: rvb: address calculation
  target/riscv: rvb: add/sub with postfix zero-extend
  target/riscv: rvb: support and turn on B-extension from command line

 target/riscv/bitmanip_helper.c          | 128 +++++
 target/riscv/cpu.c                      |   4 +
 target/riscv/cpu.h                      |   2 +
 target/riscv/helper.h                   |   9 +
 target/riscv/insn32-64.decode           |  37 ++
 target/riscv/insn32.decode              |  54 ++-
 target/riscv/insn_trans/trans_rvb.c.inc | 475 +++++++++++++++++++
 target/riscv/meson.build                |   1 +
 target/riscv/translate.c                | 597 ++++++++++++++++++++++++
 9 files changed, 1301 insertions(+), 6 deletions(-)
 create mode 100644 target/riscv/bitmanip_helper.c
 create mode 100644 target/riscv/insn_trans/trans_rvb.c.inc

--
2.17.1

On 11/18/20 12:29 AM, frank.chang@sifive.com wrote:
> This patchset implements RISC-V B-extension latest draft version
> (2020.10.26) Zbb, Zbs and Zba subset instructions.

With some additional instructions from Zbp, it seems.  Although the document
isn't completely coherent, with various instructions being present in multiple
subsets, and some instructions w/ strike-out.

The B extension requires more than these three, but I suppose turning it on
with just these 3 subsets during development is ok.


r~

On Fri, Nov 20, 2020 at 6:26 AM Richard Henderson <
richard.henderson@linaro.org> wrote:

> On 11/18/20 12:29 AM, frank.chang@sifive.com wrote:
> > This patchset implements RISC-V B-extension latest draft version
> > (2020.10.26) Zbb, Zbs and Zba subset instructions.
>
> With some additional instructions from Zbp, it seems.  Although the
> document
> isn't completely coherent, with various instructions being present in
> multiple
> subsets, and some instructions w/ strike-out.
>
> The B extension requires more than these three, but I suppose turning it on
> with just these 3 subsets during development is ok.
>
>
> r~
>

Yes, some instructions are striked out and moved to another subset during
my implementation.
The B extension spec. is still changing occasionally.

I will send out the next patchset based on your comments.
Thanks for the reviews.

Frank Chang