re PR middle-end/17961 (ICE for operation on small vector with altivec enabled)

	PR 17961
	* config/rs6000/sysv4.h (ROUND_TYPE_ALIGN): Remove.
	* config/rs6000/linux64.h (ROUND_TYPE_ALIGN): Remove vector check.
	* testsuite/gcc.dg/simd-3.c: New.

From-SVN: r100820

gcc/config/rs6000/linux64.h

@@ -228,13 +228,11 @@ extern int dot_symbols;
    the first field is an FP double, only if in power alignment mode.  */
 #undef  ROUND_TYPE_ALIGN
 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)			\
-  ((TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE)		\
-   ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)				\
-   : (TARGET_64BIT							\
-      && (TREE_CODE (STRUCT) == RECORD_TYPE				\
-	  || TREE_CODE (STRUCT) == UNION_TYPE				\
-	  || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)			\
-      && TARGET_ALIGN_NATURAL == 0)					\
+  ((TARGET_64BIT							\
+    && (TREE_CODE (STRUCT) == RECORD_TYPE				\
+	|| TREE_CODE (STRUCT) == UNION_TYPE				\
+	|| TREE_CODE (STRUCT) == QUAL_UNION_TYPE)			\
+    && TARGET_ALIGN_NATURAL == 0)					\
    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)	\
    : MAX ((COMPUTED), (SPECIFIED)))
 

gcc/config/rs6000/sysv4.h

@@ -335,15 +335,6 @@ do {									\
 	((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 	 ? 128 : COMPUTED)
 
-/* Define this macro as an expression for the alignment of a type
-   (given by TYPE as a tree node) if the alignment computed in the
-   usual way is COMPUTED and the alignment explicitly specified was
-   SPECIFIED.  */
-#define ROUND_TYPE_ALIGN(TYPE, COMPUTED, SPECIFIED)			\
-	((TARGET_ALTIVEC  && TREE_CODE (TYPE) == VECTOR_TYPE)		\
-	 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)			\
-	 : MAX (COMPUTED, SPECIFIED))
-
 #undef  BIGGEST_FIELD_ALIGNMENT
 
 /* Use ELF style section commands.  */

gcc/testsuite/gcc.dg/simd-3.c

+/* { dg-do compile } */
+/* { dg-options "-maltivec" { target powerpc-*-* } } */
+
+__attribute__ ((vector_size (2))) signed char v1, v2, v3;
+void
+one (void)
+{
+  v1 = v2 + v3;
+}
+
+__attribute__ ((vector_size (8))) signed char v4, v5, v6;
+void
+two (void)
+{
+  v4 = v5 + v6;
+}