A C++ library of (largely) SystemC compatible compile time fixed point data types for fast simulation and synthesis

The objective of this library is to provide classes for the following types

• sc_fixed
• sc_ufixed
• sc_int
• sc_uint

that are

• a) much faster for simulation than the current equivalent SystemC types
• b) potentially synthesisable using current high-level synthesis tools
• c) have more intuitive return types for various math operations such as addition,subtraction, multiplication, etc

Initial support will only be for

• Saturation modes : SC_WRAP, SC_SAT, SC_SAT_SYM and
• Rounding modes : SC_RND, SC_TRN

These types will exist in the namespace sc_ft and will be able to co-exist with current SystemC types as long as header files do not contain lines such as "using namespace sc_dt;"

This code compiles with both GCC 4.2.1 and 4.7.0 (using C++011)

To see the fixed-point type semantics for the integer types, please look at file test_ints/Type_Info.txt

This is an example of the output of the test run in the speed_test directory.

This is with GCC 4.2.1

    SystemC 2.3.0-ASI --- Jul 11 2013 17:10:30
    Copyright (c) 1996-2012 by all Contributors,
    ALL RIGHTS RESERVED

Starting Loops with Loops = 2097152

With "Range Support"

   double    Time elapsed = 0.118704  Factor = 1
   sc_dt     Time elapsed = 38.9866  Factor = 328.436
   sc_ft     Time elapsed = 0.411665  Factor = 3.468

Without "Range Support"

   double    Time elapsed = 0.117503  Factor = 1
   sc_dt     Time elapsed = 37.3403  Factor = 317.782
   sc_ft     Time elapsed = 0.0962961  Factor = 0.819519