From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Jeff Law <law@redhat.com>
Cc: coypu@sdf.org, gcc@gcc.gnu.org
Subject: Re: Internal compiler error building libstdc++ for vax
Date: Tue, 10 Apr 2018 19:38:00 -0000 [thread overview]
Message-ID: <alpine.LFD.2.21.1804102003080.25629@eddie.linux-mips.org> (raw)
In-Reply-To: <8de91fe0-dc79-b92e-dfdc-281de90b61e9@redhat.com>
On Sun, 8 Apr 2018, Jeff Law wrote:
> I think you need to go back to my earlier reply and read it carefully.
> In particular, you need an insn where the label_ref and pc are swapped.
Ouch, there are no reversed interlocked branch instructions in the VAX
ISA, so these would have to branch around a jump. Like say:
(define_insn "*jbbssisi_reversed"
[(parallel
[(set (pc)
(if_then_else
(ne (zero_extract:SI (match_operand:SI 0 "memory_operand" "Q")
(const_int 1)
(match_operand:SI 1 "general_operand" "nrm"))
(const_int 0))
(pc))
(label_ref (match_operand 2 "" "")))
(set (zero_extract:SI (match_operand:SI 3 "memory_operand" "+0")
(const_int 1)
(match_dup 1))
(const_int 1))])]
""
"jbssi %1,%0,0f;jbr %l2;0:")
and likewise with the other modes.
Is this what you have in mind?
Maciej
next prev parent reply other threads:[~2018-04-10 19:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-15 13:40 coypu
2018-03-19 21:46 ` coypu
2018-03-19 22:03 ` Jeff Law
2018-04-02 16:15 ` coypu
2018-04-08 15:22 ` Jeff Law
2018-04-10 19:38 ` Maciej W. Rozycki [this message]
2018-04-11 19:24 ` Jeff Law
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