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Re: [PATCH] Handle sparc compare-and-branch
- From: Mark Kettenis <mark dot kettenis at xs4all dot nl>
- To: davem at davemloft dot net
- Cc: gdb-patches at sourceware dot org
- Date: Sat, 21 Apr 2012 12:11:34 +0200 (CEST)
- Subject: Re: [PATCH] Handle sparc compare-and-branch
- References: <20120420.203408.165318333491237734.davem@davemloft.net>
> 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.