From: Richard Henderson <rth@twiddle.net>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [Qemu-devel] [PULL 03/18] target-alpha: Store IOV exception in fp_status
Date: Wed, 09 Jul 2014 09:48:13 -0700 [thread overview]
Message-ID: <53BD724D.2060704@twiddle.net> (raw)
In-Reply-To: <CAFEAcA_7RdUmEUhRCnkjh34tuSbFz2=8s3bU7p3GF08i0kpDcg@mail.gmail.com>
On 07/09/2014 09:28 AM, Peter Maydell wrote:
> I don't think we should use softfloat flag bits for keeping
> information which isn't about softfloat's status. Why can't
> you just put this in the per-CPU state?
It is (mostly) being stored in per-CPU state. But for efficiency, the per-CPU
state is in the softfloat format.
For this new bit, I'd prefer to not require a second load to examine the
exception flags for the insn. And while I could privately define a symbol for
the unused bit in the existing softfloat status, that seemed more hazardous
than just defining the bit in the global softfloat enumeration.
r~
next prev parent reply other threads:[~2014-07-09 16:48 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-09 16:20 [Qemu-devel] [PULL for-2.1 00/18] target-alpha patch queue Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 01/18] target-alpha: Forget installed round mode after MT_FPCR Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 02/18] target-alpha: Set PC correctly for floating-point exceptions Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 03/18] target-alpha: Store IOV exception in fp_status Richard Henderson
2014-07-09 16:28 ` Peter Maydell
2014-07-09 16:48 ` Richard Henderson [this message]
2014-07-09 16:20 ` [Qemu-devel] [PULL 04/18] target-alpha: Set fpcr_exc_status even for disabled exceptions Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 05/18] target-alpha: Set EXC_M_SWC for exceptions from /S insns Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 06/18] target-alpha: Raise IOV from CVTTQ Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 07/18] target-alpha: Fix cvttq vs large integers Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 08/18] target-alpha: Fix cvttq vs inf Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 09/18] target-alpha: Fix integer overflow checking insns Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 10/18] target-alpha: Implement WH64EN Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 11/18] target-alpha: Disallow literal operand to 1C.30 to 1C.37 Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 12/18] target-alpha: Ignore the unused fp_status exceptions Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 13/18] target-alpha: Raise EXC_M_INV properly for fp inputs Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 14/18] target-alpha: Suppress underflow from CVTTQ if DNZ Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 15/18] target-alpha: Raise IOV from CVTQL Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 16/18] target-alpha: Rename fcvtql Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 17/18] target-alpha: Fix fpcr_flush_to_zero initialization Richard Henderson
2014-07-09 16:20 ` [Qemu-devel] [PULL 18/18] target-alpha: Remove DNOD bit from FPCR Richard Henderson
2014-07-09 16:30 ` [Qemu-devel] [PULL for-2.1 00/18] target-alpha patch queue Peter Maydell
2014-07-09 16:37 ` Richard Henderson
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