conversions between vectors

[Aldy Hernandez]

hi guys.

here is a patch to handle conversions between vectors.  vectors of the
same size should convert without a problem.

i found this problem while trying to do:

	vector int foo;
	vector unsigned int bar;

	foo=bar;

the following should also convert without a problem:

	vector char foo;
	vector int bar;

	foo = bar;	// should a warning be emitted? 
			// in convert_and_check?

provided, foo and bar are of the same size.

btw, convert_to_vector() further down the line will check that the sizes
are the same.

a c++ version is forthcoming.

ok?

-- 
Aldy Hernandez			E-mail: aldyh@redhat.com
Professional Gypsy
Red Hat, Inc.

2001-12-21  Aldy Hernandez  <aldyh@redhat.com>

	* gcc.dg/altivec-3.c: New.

	* c-typeck.c (convert_for_assignment): Handle vectors.


Index: c-typeck.c
===================================================================
RCS file: /cvs/uberbaum/gcc/c-typeck.c,v
retrieving revision 1.161
diff -c -p -r1.161 c-typeck.c
*** c-typeck.c	2001/12/17 04:19:08	1.161
--- c-typeck.c	2001/12/21 23:51:16
*************** convert_for_assignment (type, rhs, errty
*** 4159,4164 ****
--- 4159,4168 ----
  	       || coder == BOOLEAN_TYPE))
      return convert_and_check (type, rhs);
  
+   /* Vectors of the same size interconvert.  */
+   else if ((codel == VECTOR_TYPE && coder == VECTOR_TYPE))
+     return convert_and_check (type, rhs);
+ 
    /* Conversion to a transparent union from its member types.
       This applies only to function arguments.  */
    else if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) && ! errtype)
Index: testsuite/gcc.dg/altivec-3.c
===================================================================
RCS file: altivec-3.c
diff -N altivec-3.c
*** /dev/null	Tue May  5 13:32:27 1998
--- altivec-3.c	Fri Dec 21 15:51:16 2001
***************
*** 0 ****
--- 1,17 ----
+ /* { dg-do compile { target powerpc-*-* } } */
+ /* { dg-options "-maltivec" } */
+ 
+ /* Program to test conversions between vector types.  This needs
+    to run on a target that has vectors, so use AltiVec.  */
+ 
+ #define vector __attribute__((vector_size(16)))
+ 
+ vector int sue;
+ vector unsigned int anne;
+ vector char darcy;
+ 
+ void foo()
+ {
+   sue = anne;
+   darcy = sue;
+ }