Hello Dmitry,
The msp430 is new for me but maybe this is a idea.
mov r15, r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
rra r14
Okay, i know, this is not the solution.....
Robert
Dmitry wrote:
> Ok, the problem is:
>
> assume that some value is in r15.
> I need to extract a sign bit of r15 and extend it to whole word and save thes
> in r14.
> For example:
>
> r15 r14
> 0x8f01 0xffff
> 0x7341 0x0000
>
> The first solution is simple:
>
> mov #-1, r14
> tst r15
> jl .lab
> mov #0, r14
> .lab:
>
> Another one is:
> mov r15, r14
> swpb r14
> sxt r14
> swpb r14
> sxt r14
>
> Can anyone invent a simpler solution?
>
> Cheers,
> ~d
>
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