Re: Help with Hand-Optimized Assembly

[io_x]

"io_x" <a@b.c.invalid> ha scritto nel messaggio 
news:4f193789$0$1389$4fafbaef@reader1.news.tin.it...
>
> "Terje Mathisen" <"terje.mathisen at tmsw.no"@giganews.com> ha scritto nel
> messaggio iqe6u8-os52.ln1@ntp6.tmsw.no">news:iqe6u8-os52.ln1@ntp6.tmsw.no...
>>> inline double delta(double th1, th2)
>
> why not 2 loops [one for normalize delta >pi and one for < -pi]?
>
> difPimPi(double x, y)
>    x-=y     |>?#.2
> .1: x>=-pi#.3|x+=2*pi|#.1
> .2: x< +pi#.3|x-=2*pi|#.2
> .3:
> ret
>
> or someting in one 'pseudocode' good enought for
> represent the problem...
>
> i32 difPimPi(d64 *r, x, y)
> {   if(MemIsOut(r)) goto .e;

better than above
if(MemIsOut(r, sizeof( d64))) goto .e;
is difficult to know if a range is in the process?

>    if(IsNanOrErr(x)||IsNanOrErr(y))
> .e:             return -1;
>     x-=y
>    if(CF()) goto .e;
>    if(x>0)  goto .2; // or better if(SignFlag()>0)  goto .2
> .1: if(x>=-pi) goto .3; x+=2*pi; goto .1;
> .2: if(x<  pi) goto .3; x-=2*pi; goto .2;
> .3: *r=x; return 0;
> }
>
> where i32 is int signed 32 bit
> and d64 is double 64 bits
>
> i check every possible error with this last?
> how many error do someone of you find in that?
> how many UB do you find if the last is one C program?
>
>
>