From: Richard Henderson <richard.henderson@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [PATCH v2 02/15] tcg/arm: Add host vector framework
Date: Mon, 8 Feb 2021 10:58:38 -0800 [thread overview]
Message-ID: <8f830dcb-2769-ca7d-460f-6095a5a47c1b@linaro.org> (raw)
In-Reply-To: <CAFEAcA9C+DG33fu-=zNN+6M9qc_bh6Lc=jx0ttNLg-tQWQtrxA@mail.gmail.com>
On 2/8/21 10:28 AM, Peter Maydell wrote:
> On Mon, 8 Feb 2021 at 17:53, Peter Maydell <peter.maydell@linaro.org> wrote:
>> The AAPCS says that q4-q7 are preserved across calls.
>
> Speaking of which, doesn't that mean we also need to
> save and restore q4-q7 in tcg_target_qemu_prologue()
> if we might be generating neon insns? (It doesn't look like
> aarch64's prologue does this, which seems like a bug.)
I just put them on the reserved list so that they don't get used.
> tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_V8);
...
> tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_V15);
We have way more vector registers than TCG will currently use, and we have to
assume all helpers can modify env->memory, so avoiding the call-saved ones is best.
r~
next prev parent reply other threads:[~2021-02-08 23:01 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 2:46 [PATCH v2 00/15] tcg/arm: host neon support Richard Henderson
2021-02-08 2:46 ` [PATCH v2 01/15] tcg: Change parameters for tcg_target_const_match Richard Henderson
2021-02-08 17:43 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 02/15] tcg/arm: Add host vector framework Richard Henderson
2021-02-08 17:53 ` Peter Maydell
2021-02-08 18:28 ` Peter Maydell
2021-02-08 18:58 ` Richard Henderson [this message]
2021-02-08 19:30 ` Peter Maydell
2021-02-08 22:26 ` Richard Henderson
2021-02-08 2:46 ` [PATCH v2 03/15] tcg/arm: Implement tcg_out_ld/st for vector types Richard Henderson
2021-02-08 17:56 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 04/15] tcg/arm: Implement tcg_out_mov " Richard Henderson
2021-02-08 18:02 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 05/15] tcg/arm: Implement tcg_out_dup*_vec Richard Henderson
2021-02-08 18:14 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 06/15] tcg/arm: Implement minimal vector operations Richard Henderson
2021-02-08 18:20 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 07/15] tcg/arm: Implement andc, orc, abs, neg, not " Richard Henderson
2021-02-08 18:22 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 08/15] tcg/arm: Implement TCG_TARGET_HAS_shi_vec Richard Henderson
2021-02-08 19:35 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 09/15] tcg/arm: Implement TCG_TARGET_HAS_mul_vec Richard Henderson
2021-02-08 19:36 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 10/15] tcg/arm: Implement TCG_TARGET_HAS_sat_vec Richard Henderson
2021-02-08 19:36 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 11/15] tcg/arm: Implement TCG_TARGET_HAS_minmax_vec Richard Henderson
2021-02-08 19:38 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 12/15] tcg/arm: Implement TCG_TARGET_HAS_bitsel_vec Richard Henderson
2021-02-08 19:55 ` Peter Maydell
2021-02-08 22:27 ` Richard Henderson
2021-02-08 2:46 ` [PATCH v2 13/15] tcg/arm: Implement TCG_TARGET_HAS_shv_vec Richard Henderson
2021-02-08 20:50 ` Peter Maydell
2021-02-08 22:27 ` Richard Henderson
2021-02-08 2:46 ` [PATCH v2 14/15] tcg/arm: Implement TCG_TARGET_HAS_roti_vec Richard Henderson
2021-02-08 20:51 ` Peter Maydell
2021-02-08 2:46 ` [PATCH v2 15/15] tcg/arm: Implement TCG_TARGET_HAS_rotv_vec Richard Henderson
2021-02-08 20:52 ` Peter Maydell
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8f830dcb-2769-ca7d-460f-6095a5a47c1b@linaro.org \
--to=richard.henderson@linaro.org \
--cc=peter.maydell@linaro.org \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).