[Bug middle-end/30172] Operations with partly constant complex values not folded

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2006-12-13 13:31 -------
__complex__ ( x, y ) * I  == __complex__ ( -y,  x )
__complex__ ( x, y ) * -I == __complex__ (  y, -x )

but only if we don't honor NaNs or signed zeros.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30172