On Wed, Apr 19, 2006 at 05:30:54PM +0200, Paolo Bonzini wrote: > > The C spec for Altivec (not the ISA) is a horrible spec that set a > horrible de facto standard. To some extent, gcc already departed from > Altivec, for example by disallowing the (vector int) (1, 2, 3, 4) syntax > -- notice the parentheses instead of the braces -- because it was > extremely hackish to implement in a Bison parser.
The Motorola AltiVec PIM (sorry, I'm looking at a hard copy and don't have the link handy) says: 2.4.2 Assignment If either the left hand side or right hand side of an expression has a vector type, then both sides of the expression must be of the same vector type. Thus, the expression a = b is valid and represents assignment if a and b are of the same vector type (or if neither is a vector type). Otherwise, the expression is invalid and must be signaled as an error by the compiler. We can't blame this admittedly horrible spec for this one. Janis
