[Bug rtl-optimization/5739] "const" and "pure" function attributes pessimize code

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-26 00:38 -------
I understand what is going on now:
      double ur = p->re;
      double ui = p->im;
      double u2 = ur * ur + ui * ui;             
      double cosv = mycos (u2);
      double sinv = mysin (u2);
      p->re = p->re * cosv - p->im * sinv;  <--- here we actually do not load again from p->re  but 
rather use ur which makes we store on the stack (or keep in register for targets with more than a few FP 
registers like PPC, in which case this works correctly :) ).

So this is really only happens on x86 

-- 
           What    |Removed                     |Added
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   Last reconfirmed|2004-05-27 23:04:12         |2004-08-26 00:38:25
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=5739