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Re: [PATCH 3/8] target/riscv: Addition of 128-bit ldu, lq and sq instruc

From: Philippe Mathieu-Daudé
Subject: Re: [PATCH 3/8] target/riscv: Addition of 128-bit ldu, lq and sq instructions
Date: Mon, 30 Aug 2021 23:35:35 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 8/30/21 7:16 PM, Frédéric Pétrot wrote:
> Addition of the load(s) and store instructions of the 128-bit extension.
> These instructions have addresses on 128-bit but explicitly assume that the
> upper 64-bit of the address registers is null, and therefore can use the
> existing address translation mechanism.
> 128-bit memory access identification and 64-bit signedness is handled a bit
> off-the-record:
> MemOp reserves 2 bits for size and a contiguous 3rd bit for the sign, so we
> cannot simply take value 4 to indicate a size of 16 bytes.
> Additionally, MO_TEQ | MO_SIGN seems to be a sentinel value, leading to a
> QEMU assertion violation.
> Modifying the existing state in QEMU has a great impact that we are not
> capable of fully evaluating, so we choose to pass this information into
> another parameter and let memop as it is for now.
> Signed-off-by: Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr>
> Co-authored-by: Fabien Portas <fabien.portas@grenoble-inp.org>
> ---
>  include/tcg/tcg-op.h                    |   1 +
>  tcg/tcg-op.c                            |   6 +

Please split in 2 patches, first TCG generic,

>  target/riscv/insn16.decode              |  33 ++++-
>  target/riscv/insn32.decode              |   5 +
>  target/riscv/insn_trans/trans_rvi.c.inc | 188 +++++++++++++++++++++---

Second particular RISCV implementation.

>  5 files changed, 207 insertions(+), 26 deletions(-)

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