From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: davem@davemloft.net
Cc: gdb-patches@sourceware.org
Subject: Re: [PATCH] Handle sparc compare-and-branch
Date: Sat, 21 Apr 2012 17:10:00 -0000 [thread overview]
Message-ID: <201204211011.q3LABYvY005548@glazunov.sibelius.xs4all.nl> (raw)
In-Reply-To: <20120420.203408.165318333491237734.davem@davemloft.net> (message from David Miller on Fri, 20 Apr 2012 20:34:08 -0400 (EDT))
> Date: Fri, 20 Apr 2012 20:34:08 -0400 (EDT)
> From: David Miller <davem@davemloft.net>
>
> SPARC-T4 adds a "compare and branch" instruction which fuses
> a compare and a branch instruction into one. The branch
> is non-delayed, there are no anulling facilities, and the
> displacement is 10-bits.
Is this new instruction documented anywhere?
> This also corrects the existing bit test for Branch on
> Integer Register. The distinguising characteristic between
> Branch on Integer Register and Compare-and-Branch is bit
> 28. The existing code was checking bit 24 for zero, but
> that's pointless because bit 24 is already covered by
> the "X_OP2 (insn) == 3" test.
>
> Ok to commit?
Makes sense to me, so please go ahead.
> gdb/
>
> * sparc-tdep.c (X_DISP10): Define.
> (sparc_analyze_control_transfer): Handle compare-and-branch.
next prev parent reply other threads:[~2012-04-21 10:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-21 2:22 David Miller
2012-04-21 17:10 ` Mark Kettenis [this message]
2012-04-21 22:29 ` David Miller
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