How to store the 64 bit result in TI C64x+ in ELF format? For example: how to store the result of double _smpy2 (int src1, int sr2);

hsg ken

We are trying to use 64 bit intermediate values in ELF format, it is first of all allowed?

If yes, how to store the 64 bit result in TI C64x+ in ELF format? For example: how to store the result of the below operation function in ELF format,

"double _smpy2 (int src1, int sr2)"

Can you please suggest what variable to use, does double directly work as 64 bit value or is there any variable for storing the 64 bit values. Thanks in advance.

over 7 years ago

0 George Mock over 7 years ago

TI__Guru**** 232790 points

Type double is 64-bits wide on the C6000 compiler. Use it like you do any other built-in type.

Thanks and regards,

-George

0 hsg ken over 7 years ago in reply to George Mock

Intellectual 560 points

Hi George, Thanks for your quick response. But are you sure double would be 64 bits even in ELF format, since I remember reading somewhere that in ELF format C64x+ supports only till 40 bits and that too using __int40_t data type, please correct me if I am wrong...

0 George Mock over 7 years ago in reply to hsg ken

TI__Guru**** 232790 points

The type double is 64-bits in both COFF ABI and EABI (which uses ELF object file format).

You may be getting this mixed up with type long. The type long changes from 40-bits to 32-bits. Please see this wiki article for more details on that change.

Thanks and regards,

-George

0 hsg ken over 7 years ago in reply to George Mock

Intellectual 560 points

Thanks George, we would try your suggestion and get back if there are any issues...

0 Archaeologist over 7 years ago in reply to hsg ken

TI__Guru* 84225 points

You should avoid using _smpy2 and instead use _smpy2ll. _smpy2 is deprecated.
long long _smpy2ll(int, int);

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How to store the 64 bit result in TI C64x+ in ELF format? For example: how to store the result of double _smpy2 (int src1, int sr2);