[Libre-soc-bugs] [Bug 448] MUL pipeline unit tests

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=448

--- Comment #31 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Cole Poirier from comment #23)

> I'm sorry I don't understand what you're directing me to do here, can you
> elaborate?

x = 0x7fffffff # plus some small randomness

ra = random value

rb = x // ra # integer divide

put ra and rb into regs 1 and 2

very simple.

what this is testing is: *when* you multiply 2 numbers that *might* overflow,
does it overflow, yes or no.

if you tried with just a random ra and a random rb you would never hit
0x7ffffff not with millions of tests.

so calculate it.

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