On Wed, 3 Oct 2012, Kenneth Zadeck wrote:
The patch defines a new datatype, a 'wide_int' (defined in
wide-int.[ch], and this datatype will be used to perform all of the
integer constant math in the compiler. Externally, wide-int is very
similar to double-int except that it does not have the limitation that
math must be done on exactly two HOST_WIDE_INTs.
Internally, a wide_int is a structure that contains a fixed sized
array of HOST_WIDE_INTs, a length field and a mode. The size of the
array is determined at generation time by dividing the number of bits
of the largest integer supported on the target by the number of bits
in a HOST_WIDE_INT of the host. Thus, with this format, any length of
integer can be supported on any host.
Hello,
did you consider making the size of wide_int a template parameter, now
that we are using C++? All with a convenient typedef or macro so it
doesn't show. I am asking because in vrp I do some arithmetic that
requires 2*N+1 bits where N is the size of double_int.
--
Marc Glisse
