Re: change "raise illegal instruction" -> "reserved" for static encodings

Krste Asanovic

There is text in some places stating this, but it is also something that needs to get reemphasized in the base ISA manual intro.


On Oct 25, 2020, at 4:37 PM, Roger Espasa <roger.espasa@...> wrote:

Did you keep/add text encouraging implementations to indeed raise illegal on reserved encodings ? I went through the patch (rather quickly) and did not see it. 


On Mon, 26 Oct 2020 at 00:32, Krste Asanovic <krste@...> wrote:

I'm working through updates to vector spec, and one part of clean up
is changing text where it has mandatory raising of illegal instruction
exceptions on unsupported encodings to instead state the encoding is
"reserved".  This will allow future extensions to use these encodings,
while current implementations can continue (and are encouraged) to
raise illegal instruction exceptions on unsupported reserved

We didn't talk through this in meetings, but I assume this will be


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