[Libre-soc-bugs] [Bug 653] investigate FFT, DCT, etc for REMAP in SVP64

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Tue Jun 22 17:57:58 BST 2021


--- Comment #2 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
see v3.0C p47

current idea being explored, a new Form
byte-reversed mode SVP64 a new form would be used:

OP RT RA RC immediate
0  6  11 16 21     31

this gives *both* an immediate *and* a (dynamic) shift amount, to be able to
perform the following Effective Address calculation:

EA = RA +
     (bitrev(srcstep) * imm)
     << RC

* the bitrev is at width log2(VL) 
* imm will typically be width of the data

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