[C, C++] fundamental type object representation

[Gabriel Dos Reis]

Paul Schlie <schlie@comcast.net> writes:

[...]

| > OK, thanks.  I was rewriting part of valarray and I saw I made that
| > assumption, and since it is bug chasing time I thought I should make
| > sure my use of memset() isn't going to bomb out.
| 
| - If of any help, the c4x's float format is: [exp:8|sign:1|fract:23]
|   where the exponent is encoded in 2's complement form thereby:
| 
|   (float)0  :: [0|0|0] :: 1.0*2^0 :: 1.0
| 
|   and further defined that an exponent of -128 regardless of the value
|   of it's sign and fraction fields is interpreted as 0.0, thereby:
| 
|   (int)0.0 :: (int)X*2^-128 :: may = (int)[-128|0|0] :: -2,147,483,648
| 
|   So if it's defined that non otherwise initialized static data fields
|   are initialized to all zero's, then correspondingly such floats will be
|   interpreted as being initialized to 1.0 as far as the c4x is concerned;
|   which may or may not be ok, but possibly reasonable if simply known to
|   the the case?

That may probably be OK -- I haven't heard of a C4X user doing
instensive computations with valarray.  But I guess I'll stick to the
explicit loop and avoid having to revisit the valarray mess again.

However, Ian and you have intrigued me; do you have a (preferably
online) reference to C4X model?

Thanks,

-- Gaby