[Bug target/15286] ICE cause by reload

[uweigand at gcc dot gnu dot org]

------- Additional Comments From uweigand at gcc dot gnu dot org  2004-10-18 12:47 
-------
On s390, CANNOT_CHANGE_MODE_CLASS does indeed return false for such
superclasses:

#define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS)               \
  (GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO)                   \
   ? reg_classes_intersect_p (FP_REGS, CLASS) : 0)

This appears to be working fine ...

As I understand, regclass does indeed avoid widening the classs to one
for which CANNOT_CHANGE_MODE_CLASS returns true; it does not check sub-
classes.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15286