Compiler/TMS320C6678: 8 bit, 4 way signed dot product on c66x

Tim Coulter

Part Number: TMS320C6678

Tool/software: TI C/C++ Compiler

In the C66x instruction set manual I do not see a SIMD instruction for an 8 bit signed dot product. What is the best set of instructions to do this?

over 7 years ago

0 George Mock over 7 years ago

TI__Guru**** 253450 points

Please consider this method. DSPLIB is an optimized general-purpose DSP function library for C Programmers. It is typically used in computationally intensive real-time applications. Find the function in DSPLIB which comes closest to solving your problem. Then adapt it to your needs.

Thanks and regards,

-George

0 Tim Coulter over 7 years ago in reply to George Mock

Prodigy 100 points

DSPLIB has a dot product that uses shorts (16 bit)... Unfortunately that is not what I need. I want to know if there is a 4 way SIMD instruction for a signed 8 bit dot product.

0 Tim Coulter over 7 years ago in reply to Tim Coulter

Prodigy 100 points

I see DOTPU4, DOTPSU4, DOTPUS4, but no DOTPS4. This just seems strange because there are signed 16b dot product instructions

0 George Mock over 7 years ago in reply to Tim Coulter

TI__Guru**** 253450 points

I am confident you have exhausted all the possibilities. Unfortunately, the instruction you want is not present. If you want to pursue this further, I recommend you start a new thread in the Keystone Multicore forum. C6600 devices are discussed in that forum. Or, if you prefer, I can move this thread to that forum.

Thanks and regards,

-George

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Compiler/TMS320C6678: 8 bit, 4 way signed dot product on c66x