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Possible to mix ncsim(64b) with DPI-C/C compiled in 32-bit address space?

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I use ncsim 64 bit version 15.10, with DPI-C to run a large C application. The C does large amount of signal processing and mainly work in 32-bit environment. 

The ncsim uses 64 bit and I can't change that. 

The C application contains many *(uint32_t *)((uint32_t) ) which I am very reluctant to change into uint64_t. 

Are there any switch so while I use 64-bit while C application runs in a 32 bit address space? 


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