c6678's Multiplies　number

Suetake Masayuki

Prodigy 40 points

Hi,

Now I am developing Correlator for software GPS on c6678 EVM. And I have a question.

What kind of assembler code do write to realize 32(16x16) multiplies?

I understand 8 multiplies, sample as follow

DMPY2 .M1 A1:A0, A3:A2, A7:A6:A5:A4

|| DMPY2 .M2 B1:B0,B3:B2,B7:B6: B5:B4

Do I need to study special coding method?

in Instruction Set Reference-

1.1.1 4x Multiply

core can now execute up to 32 (16x16-bit) multiplies per cycle.

over 13 years ago

0 Alberto Chessa over 13 years ago

Mastermind 6670 points

Hi,

I suppose it can do that only with complex,, that is DCMPY execute 2 complex mul that correspond to 8 16x16 mul.

In para. 1.1.4, table 1.1, "Vector Size" = "4x16bits", while "Fixed point 16x16 MACs per cycle" = 32 is about some other operation,such as complex and compex matrix multiplication.

0 Allen Lee over 13 years ago

Genius 3770 points

hi,

There maybe a thread to reference:

http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/t/169810.aspx

Allen

0 Suetake Masayuki over 13 years ago in reply to Allen Lee

Prodigy 40 points

Hi, Allen.

Thank you for your information.

I will read a thread.

Masayuki

0 Suetake Masayuki over 13 years ago in reply to Alberto Chessa

Prodigy 40 points

Hi Alberto

Thank you for your reply.

Certainly, DCMPY instruction can execute 8(16x16) multiplies per cycle.

I will reconfirm Instruction set.

Masayuki

0 Suetake Masayuki over 13 years ago

Prodigy 40 points

I solved this problem by using CMATMPY instruction. it can be excute 16 multiplies per cycle.

I appreciate some advices.

Masayuki

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c6678's Multiplies　number

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c6678's Multiplies number

c6678's Multiplies　number