[Libre-soc-isa] [Bug 1074] create twin-butterfly research page into DCT/FFT instructions

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1074

--- Comment #5 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
https://git.libre-soc.org/?p=openpower-isa.git;a=commitdiff;h=f8e2c0cb1467391aa7ae4b8b092c281ee2e16a7b

+            with m.If((major == 22) & xo6.matches(
+                    '-01000',  # maddsubrs
+                )):
+                comb += self.implicit_rs.eq(1)
+                comb += self.extend_rb_maxvl.eq(1) # extend RB

this says "RB is the extended register offset by MAXVL", and
detects the opcode 22 XO top 5 bits indicating maddsubrs.

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