Am 30.03.20 um 22:07 schrieb Christo Crause via fpc-devel:

On Sun, Mar 29, 2020 at 11:00 PM Florian Klämpfl <flor...@freepascal.org <mailto:flor...@freepascal.org>> wrote:

    Am 29.03.20 um 22:46 schrieb Christo Crause via fpc-devel:
     > It seems that a different instruction sequence should be used for
    sign
     > extension for the lx106 subarch.

    Ok, I see. Let me first integrate everything done so far in trunk, then
    we can continue with the details :)


I've noticed GCC uses the SLLI + SRAI instructions to perform sign extension on ESP8266.

Since different CPUs can support different subsets of the Xtensa instructions do you think a finalizecode type function can be used as a post code generation step to map unsupported instructions to alternative sequences?

In this case just cgcpu can be adapted to generate the right code. This results normally in better code.

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