Virtreg (LANL code number O4799) is a C++ code designed to perform additions and subtractions of floating-point numbers over a wide dynamic range without loss of precision.
In the src/ directory compile and run the demo,
manually entering three numbers to be added.
(assumes g++; see common/makefile for other options)
make
./virtreg
Enter double 1: 5
Enter double 2: 1e-90
Enter double 3: -5
and note the final results:
Floating point sum: 0
Virtual register sum: 1e-90
In the src/ directory compile and run the tests.
make tests
./tests