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[RFC v3 00/16] support subsets of bitmanip extension

From: frank . chang
Subject: [RFC v3 00/16] support subsets of bitmanip extension
Date: Tue, 12 Jan 2021 10:19:41 +0800

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

This patchset implements RISC-V B-extension 0.93 version Zbb, Zbs and
Zba subset instructions. Some Zbp instructions are also implemented as
they have similar behavior with their Zbb-, Zbs- and Zba-family
instructions or for Zbb pseudo instructions (e.g. rev8, orc.b).


The port is available here:

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


 * Convert existing immediate shift instructions to use gen_shifti()
   and gen_shiftiw() interfaces.
 * Rename *u.w instructions to *.uw.
 * Rename sb* instructions to b*.
 * Rename pcnt* instructions to cpop*.

 * Add gen_shifti(), gen_shiftw(), gen_shiftiw() helper functions.
 * Remove addwu, subwu and addiwu instructions as they are not longer
   exist in latest draft.
 * Optimize implementation with cleaner tcg ops.

Frank Chang (4):
  target/riscv: rvb: count bits set
  target/riscv: add gen_shifti() and gen_shiftiw() helper functions
  target/riscv: rvb: generalized reverse
  target/riscv: rvb: generalized or-combine

Kito Cheng (12):
  target/riscv: reformat @sh format encoding for B-extension
  target/riscv: rvb: count leading/trailing zeros
  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/shift with prefix zero-extend
  target/riscv: rvb: support and turn on B-extension from command line

 target/riscv/bitmanip_helper.c          | 102 ++++++
 target/riscv/cpu.c                      |   4 +
 target/riscv/cpu.h                      |   2 +
 target/riscv/helper.h                   |   9 +
 target/riscv/insn32-64.decode           |  33 ++
 target/riscv/insn32.decode              |  54 ++-
 target/riscv/insn_trans/trans_rvb.c.inc | 415 ++++++++++++++++++++++++
 target/riscv/insn_trans/trans_rvi.c.inc |  45 +--
 target/riscv/meson.build                |   1 +
 target/riscv/translate.c                | 314 ++++++++++++++++++
 10 files changed, 932 insertions(+), 47 deletions(-)
 create mode 100644 target/riscv/bitmanip_helper.c
 create mode 100644 target/riscv/insn_trans/trans_rvb.c.inc


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