mbox series

[REVIEW,ONLY,0/1] UNRATIFIED RISC-V: Add 'ZiCondOps' extension

Message ID cover.1669684562.git.research_trasio@irq.a4lg.com
Headers
Series UNRATIFIED RISC-V: Add 'ZiCondOps' extension |

Message

Tsukasa OI Nov. 29, 2022, 1:16 a.m. UTC 
  *** WAIT FOR SPECIFICATION FREEZE ***
This is an implementation for unratified and not frozen RISC-V extension
and not intended to be merged for now.
The only intent to submit this patchset is to test new instructions for
your (possibly virtual) environment and early review for fast adoption
after ratification.


This patchset adds following unratified extension to GNU Binutils:

-   'ZiCondOps' (Integer Conditional Operations)
    version 1.0 in development

which adds 2 instructions ("czero.eqz" and "czero.nez").

This extension makes conditional arithmetic feature much simpler (fewer
instructions when no branches are allowed).  Note that constant timing
guarantee (data-independence / certain side-channel resistance) for this
extension is being discussed and may not be guaranteed.


This is based on the commit 91e173db8678 of the specification document:
<https://github.com/riscv/riscv-zicondops>




Tsukasa OI (1):
  UNRATIFIED RISC-V: Add 'ZiCondOps' extension

 bfd/elfxx-riscv.c                          |  5 +++++
 gas/testsuite/gas/riscv/zicondops-noarch.d |  3 +++
 gas/testsuite/gas/riscv/zicondops-noarch.l |  3 +++
 gas/testsuite/gas/riscv/zicondops.d        | 11 +++++++++++
 gas/testsuite/gas/riscv/zicondops.s        |  3 +++
 include/opcode/riscv-opc.h                 |  8 ++++++++
 include/opcode/riscv.h                     |  1 +
 opcodes/riscv-opc.c                        |  4 ++++
 8 files changed, 38 insertions(+)
 create mode 100644 gas/testsuite/gas/riscv/zicondops-noarch.d
 create mode 100644 gas/testsuite/gas/riscv/zicondops-noarch.l
 create mode 100644 gas/testsuite/gas/riscv/zicondops.d
 create mode 100644 gas/testsuite/gas/riscv/zicondops.s


base-commit: cb44f89ce977b1ab2d4063f2487950bddfb75bc7