[Bug middle-end/20434] pessimization of complex expression

Thomas dot Koenig at online dot de gcc-bugzilla@gcc.gnu.org
Sat Mar 12 23:13:00 GMT 2005


------- Additional Comments From Thomas dot Koenig at online dot de  2005-03-12 23:13 -------
(In reply to comment #6)

> Well the real reason is creal/cimag returns double and not float.
> Use crealf/cimagf instead.

You're right, of course.  Doing that gets me

<bb 0>:
  foo (&cr, &ci);
  return cr + 0.0 + ci + 0.0 < 0.0;
 
OK, the direct cast has gone away.  I wonder if this still converts
to double, though...

> Well yes this is a missed optimization,  which should be filed separately.

I think using crealf/cimagf pretty much solves this.  If you lie to the
compiler... :-)



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20434



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