Re: [Qemu-arm] [Qemu-devel] [PATCH v2 11/32] arm/translate-a64: add FP16 F[A]C[EQ/GE/GT] to simd_three_reg_same_fp16

[Richard Henderson]

On 02/23/2018 03:59 AM, Alex Bennée wrote:
>> Not using float16_eq etc?
> 
> These don't actually exist.

Ah.

> But I guess we could make stubs for them
> based on the generic float_compare support. But would it buy us much?
...
>>> +    return ADVSIMD_CMPRES(compare == float_relation_greater ||
>>> +                          compare == float_relation_equal);
>>
>> Especially float16_le(b, a, fpst).

It buys us knowledge of the float_relation_* values, such that instead of the
two comparisons above you can use <= 0 (note that this only works for le not
ge, because of float_relation_unordered == 2).

I'll grant you that two compares vs one isn't much, but it is simpler...


r~