[fpc-devel] fpc bug with M1

Jonas Maebe jonas at freepascal.org
Thu Dec 30 14:52:24 CET 2021

On 29/12/2021 00:48, Martin Frb via fpc-devel wrote:
> I don't have an M1 myself, but according to the data from the thread on 
> the lazarus mail list, there is a bug in the 3.3.1 asm generator for M1
> var pn8: pint8; // pointer signed byte
> In the below expression ...(not pn8^)...
> "pn8^" is loaded to w0 and sign extended. From this point onwards 
> operations on the value should be 32 bits (the value has been extended, 
> and the full 32 bits are later used).
> but "not" only affects the lowest 8 bit.
> Apparently in 3.2.2 (or was it 3.2.0) there was
> mvn w0,w0
> If someone can confirm tihs....

It's probably caused by c90616944d3bde7b36e924d27a0790195d61f95c (Florian)


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