C support for full accumulator access

J_Merlin on Jul 9, 2021

Hello,

is there a way to acces the full result of an 32x32 fractional mac in C ?

The builtin accum types comprise only the upper 40 bits containig only 31 fractional bits. Is there a way in C to get hold of the lower 32 bits of the accumulator?

0 J_Merlin on Jul 13, 2021 7:35 AM

Found the solution in the Compiler-Library-Ref document.:
The built in type acc72 for blackfin+ is metioned in

"Fractional Dot Product Implemented with Accumulator Pair Built-Ins on the Blackfin+ series of
processors"

Bult-ins for accessing the acumulator are listed in

Table 2-31: Blackfin+ Accumulator Pair Built-in Functions for 32-bit Multiplies.

I would have expected these types to be mentioned in chapters

"Native Fixed-Point Types" and "Fixed-Point Type Support".

But no hint ist given there that there is much more than listed in Table 2-17.
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0 Anand Selvaraj

on Jul 14, 2021 9:21 AM in reply to J_Merlin
Hi,

Thanks for the update. Glad to know that your issue got resolved.

Regards,
Anand Selvaraj.
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