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Re: [Qemu-devel] [PATCH 0/7] target-m68k: implement 680x0 FPU
From: |
Laurent Vivier |
Subject: |
Re: [Qemu-devel] [PATCH 0/7] target-m68k: implement 680x0 FPU |
Date: |
Thu, 19 Jan 2017 12:27:13 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0 |
Le 18/01/2017 à 22:42, Richard Henderson a écrit :
> On 01/18/2017 01:05 PM, Laurent Vivier wrote:
>> This series modifies the original ColdFire FPU implementation
>> to use floatx80 instead of float64 internally as this
>> is the native datatype for 680x0. I didn't keep the float64
>> type for ColdFire, but if someone thinks it's required I
>> can update this series in this way.
>
> I think at minimum you'll need to round to float64. But this control is
> also needed for 68040 FPU, so probably you can use the same helpers.
>
> I'm thinking something like
>
> void helper_foo_d(args);
> {
> ...
> r80 = floatx80_foo(args);
> r64 = floatx80_to_float64(r80, &env->fp_status);
> r80 = float64_to_floatx80(r64, &env->fp_status);
> [store r80]
> ...
> }
>
> since iirc 68040 has fadd.d, fadd.s to go with fadd.
OK, I will modify this part.
Thanks,
Laurent
- [Qemu-devel] [PATCH 0/7] target-m68k: implement 680x0 FPU, Laurent Vivier, 2017/01/18
- [Qemu-devel] [PATCH 2/7] target-m68k: define ext_opsize, Laurent Vivier, 2017/01/18
- [Qemu-devel] [PATCH 5/7] target-m68k: add fmovem, Laurent Vivier, 2017/01/18
- [Qemu-devel] [PATCH 1/7] target-m68k: move FPU helpers to fpu_helper.c, Laurent Vivier, 2017/01/18
- [Qemu-devel] [PATCH 3/7] softfloat: define 680x0 specific values, Laurent Vivier, 2017/01/18
- [Qemu-devel] [PATCH 7/7] target-m68k: implements more FPU instructions, Laurent Vivier, 2017/01/18
- [Qemu-devel] [PATCH 6/7] target-m68k: introduce fscc., Laurent Vivier, 2017/01/18
- [Qemu-devel] [PATCH 4/7] target-m68k: use floatx80 internally, Laurent Vivier, 2017/01/18
- Re: [Qemu-devel] [PATCH 0/7] target-m68k: implement 680x0 FPU, no-reply, 2017/01/18
- Re: [Qemu-devel] [PATCH 0/7] target-m68k: implement 680x0 FPU, Richard Henderson, 2017/01/18
- Re: [Qemu-devel] [PATCH 0/7] target-m68k: implement 680x0 FPU,
Laurent Vivier <=