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From: Tsukasa OI <>
To: Tsukasa OI <>,
	Nelson Chu <>,
	Kito Cheng <>,
	Palmer Dabbelt <>
Subject: [PATCH v2 0/2] RISC-V: Opcode Tidying - Operands (batch 1)
Date: Thu, 22 Sep 2022 06:30:36 +0000	[thread overview]
Message-ID: <> (raw)


This is a small patchset to clean / maintain RISC-V instruction
operand types.

[Changes: v1 -> v2]
-   Cleaning? (possibly unchanged? then this is a ping)

[PATCH 1/2]

Since `validate_riscv_insn' function lists three macro-only operand types,
this patch adds other three operands.  That means, `validate_riscv_insn'
lists all macro-only operand types with this patch.

-   A
-   B
-   I

New in This Patch:
-   c
-   VM
-   VT

Note that `validate_riscv_insn' is called only for non-macros.  In the
future, we could reject (and make an internal error) when we encountered
those macro-only operand types on regular (non-macro) instructions.

[PATCH 2/2]

The operand type "b" has no good reasons to keep and should be removed.

-   It looks like an alias of the "s" operand type.
-   It hasn't used since the beginning.
-   Its role is not clear.

On the other hand, this patch keeps following unused operand types for now:

-   Cx     : future compressed instructions?
-   Vf, Ve : vector AMO instructions (instructions are not upstreamed
             but operand types are upstreamed already)
-   [, ]   : used by some vendors? At least, their role is clear.


Tsukasa OI (2):
  RISC-V: Add macro-only operands to validate_riscv_insn
  RISC-V: Remove "b" operand type from disassembler

 gas/config/tc-riscv.c | 3 +++
 opcodes/riscv-dis.c   | 1 -
 2 files changed, 3 insertions(+), 1 deletion(-)

base-commit: 90eca7111355e4c6683c1ab10fd07107ea10f6d1

             reply	other threads:[~2022-09-22  6:30 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-22  6:30 Tsukasa OI [this message]
2022-09-22  6:30 ` [PATCH v2 1/2] RISC-V: Add macro-only operands to validate_riscv_insn Tsukasa OI
2022-09-22  6:30 ` [PATCH v2 2/2] RISC-V: Remove "b" operand type from disassembler Tsukasa OI
2022-09-22  7:04 ` [PATCH v2 0/2] RISC-V: Opcode Tidying - Operands (batch 1) Nelson Chu

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