re PR c/6290 (ICE compiling altivec code with 3.1)

	PR c/6290
	* config/rs6000/rs6000.c (easy_vector_constant): Return 1 if the
	CONST_VECTOR is { 0, ... 0 }.

	* gcc.dg/altivec-5.c: New test.

From-SVN: r52340

gcc/ChangeLog

+2002-04-16  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/6290
+	* config/rs6000/rs6000.c (easy_vector_constant): Return 1 if the
+	CONST_VECTOR is { 0, ... 0 }.
+
 2002-04-15  Loren J. Rittle  <ljrittle@acm.org>
 
 	* doc/install.texi (Installing GCC: Configuration): Clarify

gcc/config/rs6000/rs6000.c

@@ -1219,18 +1219,24 @@ easy_vector_constant (op)
 	 with CONST0_RTX for the current mode, but let's be safe
 	 instead.  */
 
-      if (GET_CODE (elt) == CONST_INT && INTVAL (elt) != 0)
-	return 0;
-
-      if (GET_CODE (elt) == CONST_DOUBLE
-	       && (CONST_DOUBLE_LOW (elt) != 0
-		   || CONST_DOUBLE_HIGH (elt) != 0))
-	return 0;
+      switch (GET_CODE (elt))
+	{
+	case CONST_INT:
+	  if (INTVAL (elt) != 0)
+	    return 0;
+	  break;
+	case CONST_DOUBLE:
+	  if (CONST_DOUBLE_LOW (elt) != 0 || CONST_DOUBLE_HIGH (elt) != 0)
+	    return 0;
+	  break;
+	default:
+	  return 0;
+	}
     }
 
   /* We could probably generate a few other constants trivially, but
      gcc doesn't generate them yet.  FIXME later.  */
-  return 0;
+  return 1;
 }
 
 /* Return 1 if the operand is the constant 0.  This works for scalars

gcc/testsuite/ChangeLog

+2002-04-16  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.dg/altivec-5.c: New test.
+
 2002-04-15  Mark Mitchell  <mark@codesourcery.com>
 
 	* testsuite/lib/chill.exp: Remove.

gcc/testsuite/gcc.dg/altivec-5.c

+/* { dg-do compile { target powerpc-*-* } } */
+/* { dg-options "-maltivec -O2" } */
+
+#define vector __attribute__((vector_size(16)))
+
+void foo (const unsigned long x,
+	  vector signed int a, vector signed int b)
+{
+  unsigned char d[64];
+
+  __builtin_altivec_stvewx (b, 0, d);
+}