How to check for overflow when adding/multiplying numbers?

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How to check for overflow when adding/multiplying numbers?
Dec 06, 2021 Dave P.
Dec 06, 2021 Ola Fosheim Grøstad
Dec 06, 2021 Dave P.

December 06, 2021

Posted by Dave P.

Dave P.

I’m porting some C code which uses the gcc intrinsics to do a multiply/add with overflow checking. See here for reference. Is there a D equivalent?

December 06, 2021

Posted by Ola Fosheim Grøstad
in reply to Dave P.

Ola Fosheim Grøstad

Posted in reply to Dave P.

On Monday, 6 December 2021 at 17:46:35 UTC, Dave P. wrote:

I’m porting some C code which uses the gcc intrinsics to do a multiply/add with overflow checking. See here for reference. Is there a D equivalent?

There is:

I have never used it, so I don't know how well it performs.

December 06, 2021

Posted by Dave P.
in reply to Ola Fosheim Grøstad

Dave P.

On Monday, 6 December 2021 at 18:38:37 UTC, Ola Fosheim Grøstad wrote:

On Monday, 6 December 2021 at 17:46:35 UTC, Dave P. wrote:

I’m porting some C code which uses the gcc intrinsics to do a multiply/add with overflow checking. See here for reference. Is there a D equivalent?

There is:

I have never used it, so I don't know how well it performs.

That seems to fit the bill.

Thanks!