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What does "synthesis away" mean in Quartus?

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jzhangsun

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what is the meaning about "sythesis away the following nodes" in quatus
 

synthesis away

the nodes are removed as they are not necessary;
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Re: synthesis away

why these nodes cant be seen in netlist generated by synplify-pro, if it is not used, the synplify will synthesis away these nodes
 

Re: synthesis away

jzhangsun said:
why these nodes cant be seen in netlist generated by synplify-pro/.../
Click to expand...
you mean can be seen instead of cant be seen ?
I just explained the meaning of the message;
this is a different story - why ?
to answer it one needs to study logs and/or the rtl itself;
if you believe synplify did a good job switch off optimization in quartus;

could be that synplify added some redundant logic to meet speed
requirements, could be that quartus found a way, overlooked by synplify,
to reduce further logic usage;
and of course could be something else ...
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