Christian Schoenebeck writes: > Es geschah am Wednesday, 19. April 2006 17:20 als Andrew Haley schrieb: > > OK, I got it now. > > > > The full spec is at > > > > http://publib.boulder.ibm.com/infocenter/macxhelp/v6v81/index.jsp?topic=/com.ibm.vacpp6m.doc/language/ref/clrc03altivec_types.htm > > Well, this is a different compiler and the docs are just about this > compiler, not a regular language specification. Sure, but it's the base we used for gcc, and it's what current users expect. > Yeah, but also consider that old PPCs did not even have an > instruction for int->float conversion. Is that a reason for > defining a scalar int->float cast as bitstream copy? Certainly not. Too late: it's the specification. See "2.4.6 Type Casting "... None of the casts performs a conversion; the bit pattern of the result is the same as the bit pattern of the argument that is cast." The full spec is at http://www-306.ibm.com/chips/techlib/techlib.nsf/techdocs/30B3520C93F437AB87257060006FFE5E/$file/SPU_language_extensions_2.1.pdf Now, you might think that we need a different specification, and lots of people would agree with you! But it's not a bug in the gcc implementation. Andrew.
