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_Fract types and conversion routines


I have a question about the _Fract types and their conversion routines.
If I compile this program:

extern void abort (void);
int main ()
{
  signed char a = -1;
  _Sat unsigned _Fract b = a;
  if (b != 0.0ur)
    abort();
  return 0;
}

with -O0 and on a MIPS32 system where char is 1 byte and unsigned (int)
is 4 bytes I see a call to '__satfractqiuhq' for the conversion.

Now I think the 'qi' part of the name is for the 'from type' of the
conversion, a 1 byte signed type (signed char), and the 'uhq' part is
for the 'to' part of the conversion.  But 'uhq' would be a 2 byte
unsigned fract, and the unsigned fract type on MIPS should be 4 bytes
(unsigned int is 4 bytes).  So shouldn't GCC have generated a call to
__satfractqiusq instead?  Or am I confused?

Steve Ellcey
sellcey@imgtec.com


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