From: Sergey Belyashov <sergey.belyashov@gmail.com>
To: "Frank Ch. Eigler" <fche@redhat.com>
Cc: cgen@sourceware.org
Subject: Re: BUG: non-fixed-length ISAs are unsupported for now
Date: Mon, 27 Apr 2020 20:00:07 +0300 [thread overview]
Message-ID: <CAOe0RDx2ppy3fqVTyWpEaVpXK-PvKeJNMEc4tKtPhqtKcmdUCA@mail.gmail.com> (raw)
In-Reply-To: <20200427162914.GA21677@redhat.com>
Hi,
Z80 has istructions from 1 byte (nop for example) up to 4 bytes long (eZ80
up to 6 bytes) including operands 0..2 bytes (eZ80 0..3 bytes). So
base-insn-bitsize is set to 8. And it is not enought for 1-3 bytes (eZ80
1-4) insn code size (w/o immediate operands).
Best regards,
Sergey Belyashov
пн, 27 апр. 2020 г., 19:29 Frank Ch. Eigler <fche@redhat.com>:
> Hi -
>
> > While analyzing code of CGEN I have found next code:
> > [...]
> > Can anybody add support for non-fixed-length ISAs?
>
> I am not expecting major cgen improvements. However, if your
> base-insn-size is large enough to contain all the opcode-like
> bits of your largest possible instruction, you may not need
> those improvements.
>
> - FChE
>
>
next prev parent reply other threads:[~2020-04-27 17:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-23 13:37 Sergey Belyashov
2020-04-27 16:29 ` Frank Ch. Eigler
2020-04-27 17:00 ` Sergey Belyashov [this message]
2020-04-27 17:52 ` Sergey Belyashov
2020-04-27 18:03 ` Jose E. Marchesi
2020-04-27 19:34 ` Sergey Belyashov
2020-04-27 20:01 ` Jose E. Marchesi
2020-04-27 20:23 ` Sergey Belyashov
2020-04-29 19:11 ` Sergey Belyashov
2020-07-30 9:11 ` Sergey Belyashov
2020-08-11 15:38 ` Frank Ch. Eigler
2020-08-11 15:57 ` Sergey Belyashov
2020-08-11 16:08 ` Frank Ch. Eigler
2020-08-12 13:59 ` Sergey Belyashov
2020-08-12 18:36 ` Frank Ch. Eigler
2020-08-12 18:53 ` Jose E. Marchesi
2020-08-12 19:19 ` Sergey Belyashov
2020-08-12 19:21 ` Frank Ch. Eigler
2020-08-12 19:27 ` Jose E. Marchesi
2020-08-12 19:44 ` Sergey Belyashov
2020-08-12 19:57 ` Frank Ch. Eigler
2020-08-13 13:34 ` Sergey Belyashov
2020-08-13 14:32 ` Frank Ch. Eigler
2020-08-13 14:47 ` Sergey Belyashov
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