On Wed, Oct 28, 2015 at 12:23 AM, Steve Ellcey <sell...@imgtec.com> wrote:
>
> 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?
did it eventually narrow the comparison? Just check some of the tree/RTL dumps.
> Steve Ellcey
> sell...@imgtec.com
