[libre-riscv-dev] fp special functions

[Luke Kenneth Casson Leighton]

On Monday, August 5, 2019, Luke Kenneth Casson Leighton <lkcl at lkcl.net>
wrote:

>
>
> On Monday, August 5, 2019, Jacob Lifshay <programmerjake at gmail.com> wrote:
>
>> On Sun, Aug 4, 2019, 22:41 Luke Kenneth Casson Leighton <lkcl at lkcl.net>
>> wrote:
>>
>> > https://libre-riscv.org/rv_major_opcode_1010011/#transcendentals_1op
>> >
>> > wow, that filled up *real* fast.  i'd missed atan, in a 2nd reading of
>> > bug #127 - got it now.
>> >
>> note that atan(x) and atanpi(x) are just atan2(x, 1.0) and atan2pi(x,
>> 1.0),
>> so the atan and atanpi instructions are not needed
>
>
> Ok great, will move them to pseudo op aliases.
>
>
Hang on... there's no immed for loading 1.0 into an FP reg, it's one of the
downsides of RISCV, a FLD is a hard requirement.

Hmmm....



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