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Re: [Qemu-devel] [PATCH v2 08/10] target-xtensa: implement FP0 conversio
From: |
Max Filippov |
Subject: |
Re: [Qemu-devel] [PATCH v2 08/10] target-xtensa: implement FP0 conversions |
Date: |
Sun, 9 Sep 2012 20:38:19 +0400 |
On Sun, Sep 9, 2012 at 8:16 PM, Peter Maydell <address@hidden> wrote:
> On 9 September 2012 17:04, Max Filippov <address@hidden> wrote:
>> These are FP to integer and integer to FP conversion opcodes.
>> See ISA, 4.3.10 for more details.
>>
>> Note that utrunc.s implementation follows ISS behaviour, not ISA.
>
> ISS here means "instruction set simulator", right? Do you
> have any actual silicon you can check behaviour against?
> Basically there are three votes here (documentation, simulator
> and silicon) and QEMU should follow the majority opinion in
> the absence of any more official word.
I have no silicon core with FP and I doubt that I can easily access one.
IIUC Tensilica ISS core-specific code is autogenerated from the hardware
description, without human intervention.
Looks like it's either documentation error or silicon error, probably
there's an erratum issued. Marc, can you please comment?
--
Thanks.
-- Max
- [Qemu-devel] [PATCH v2 01/10] softfloat: make float_muladd_negate_* flags independent, (continued)
- [Qemu-devel] [PATCH v2 01/10] softfloat: make float_muladd_negate_* flags independent, Max Filippov, 2012/09/09
- [Qemu-devel] [PATCH v2 02/10] softfloat: add NO_SIGNALING_NANS, Max Filippov, 2012/09/09
- [Qemu-devel] [PATCH v2 03/10] target-xtensa: handle boolean option in overlays, Max Filippov, 2012/09/09
- [Qemu-devel] [PATCH v2 04/10] target-xtensa: specialize softfloat NaN rules, Max Filippov, 2012/09/09
- [Qemu-devel] [PATCH v2 05/10] target-xtensa: add FP registers, Max Filippov, 2012/09/09
- [Qemu-devel] [PATCH v2 06/10] target-xtensa: implement LSCX and LSCI groups, Max Filippov, 2012/09/09
- [Qemu-devel] [PATCH v2 07/10] target-xtensa: implement FP0 arithmetic, Max Filippov, 2012/09/09
- [Qemu-devel] [PATCH v2 08/10] target-xtensa: implement FP0 conversions, Max Filippov, 2012/09/09
[Qemu-devel] [PATCH v2 09/10] target-xtensa: implement FP1 group, Max Filippov, 2012/09/09
[Qemu-devel] [PATCH v2 10/10] target-xtensa: implement coprocessor context option, Max Filippov, 2012/09/09