From: Sergey Belyashov <sergey.belyashov@gmail.com>
To: "Jose E. Marchesi" <jose.marchesi@oracle.com>
Cc: "Frank Ch. Eigler via Cgen" <cgen@sourceware.org>,
"Frank Ch. Eigler" <fche@redhat.com>
Subject: Re: BUG: non-fixed-length ISAs are unsupported for now
Date: Wed, 12 Aug 2020 22:19:43 +0300 [thread overview]
Message-ID: <CAOe0RDyi+mPUtqkcFuP7d80QS4+on=ogjhrP3VYA-iafUsRS8Q@mail.gmail.com> (raw)
In-Reply-To: <87pn7v1yrt.fsf@oracle.com>
But Zilog eZ80 CPU has instructions up to 6 bytes long: like ld.il bc,(Mmn)
(lil/sil prefix 0xed prefix <opcode> <n> <m> <M>) .
ср, 12 авг. 2020 г., 21:53 Jose E. Marchesi <jose.marchesi@oracle.com>:
>
> >> I have tried it. Result is the same: ifields are just added (part of
> >> generated z80-opc.c):
> >
> > I'm unfortunately unable to actually run cgen here (apparent
> > incompatibility with "new" fedora32-level guile), so am only guessing
> > that you could try setting the cpu base-insn-size to 16 or even 32:
> > enough bits to tell the instructions apart.
>
> That looks like the right approach.
>
> Currently CGEN does not support having opcodes (constant fields) past
> the base part of the insn, which by the way is limited to a maximum of
> 32-bit.
next prev parent reply other threads:[~2020-08-12 19:19 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
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 [this message]
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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