[Libre-soc-bugs] [Bug 745] OP_TERNLOG instruction

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=745

--- Comment #40 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
ahh, and *this* works.

@@ -12,7 +12,7 @@ Pseudo-code:
     result <- [0] * XLEN
     do i = 0 to XLEN - 1
       idx <- (RT)[i] || (RA)[i] || (RB)[i]
-      result[i] <- (TLI & ROTL64(1, idx)) != 0
+      result[i] <- TLI[7-idx]
     RT <- result

nuts.  note the 7-idx.  IBM will have a fit about that,
it's LSB0-to-MSB0 conversion and i'm pretty sure they'll
want (insist on) MSB0 being in the spec.

deep breath: the spec needs to read:

      result[i] <- TLI[idx]

and... sigh... all the unit tests, HDL, everything, changed to
match that.

i know.  it's annoying, but we don't want to irritate the
IBM members of the ISA WG by not following the conventions
of 30 years.

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