Improve precision of float numbers

04162019, 03:59 PM
(This post was last modified: 04172019 02:46 PM by Jonathan Busby.)
Post: #11




RE: Improve precision of float numbers
Have you thought of using a scheme like that used for DEC64? It has all the speed advantages of binary floating point along with all the accuracy benefits of BCD, plus, it supports a a larger range of values.
Each DEC64 value is represented as M*10^(e) where M is the 2's complement mantissa and e is the 2's complement exponent. In the DEC64 implementation, M is 56 bits and e is 8 bits. For an MCU, one could use exponents and mantissas that use fewer bits  it doesn't affect the basic idea. The only semi computationally expensive process involved with DEC64 is the entry and display of the numbers, but, both of those processes can be executed very quickly. Regards, Jonathan Aeternitas modo est. Longa non est, paene nil. 

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