===================================================================
@@ -155,6 +155,7 @@
#ifdef TREE_CODE
extern unsigned int rs6000_data_alignment (tree, unsigned int, enum data_align);
+extern bool rs6000_special_adjust_field_align_p (tree, unsigned int);
extern unsigned int rs6000_special_round_type_align (tree, unsigned int,
unsigned int);
extern unsigned int darwin_rs6000_special_round_type_align (tree, unsigned int,
===================================================================
@@ -5878,6 +5878,32 @@
return align;
}
+/* Previous GCC releases forced all vector types to have 16-byte alignment. */
+
+bool
+rs6000_special_adjust_field_align_p (tree field, unsigned int computed)
+{
+ if (TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (field)) == VECTOR_TYPE)
+ {
+ if (computed != 128)
+ {
+ static bool warned;
+ if (!warned && warn_psabi)
+ {
+ warned = true;
+ inform (input_location,
+ "the layout of aggregates containing vectors with"
+ " %d-byte alignment has changed in GCC 4.10",
+ computed / BITS_PER_UNIT);
+ }
+ }
+ /* In current GCC there is no special case. */
+ return false;
+ }
+
+ return false;
+}
+
/* AIX increases natural record alignment to doubleword if the first
field is an FP double while the FP fields remain word aligned. */
===================================================================
@@ -292,7 +292,7 @@
/* An expression for the alignment of a structure field FIELD if the
alignment computed in the usual way is COMPUTED. */
#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
- ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE) \
+ (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED)) \
? 128 : COMPUTED)
#undef BIGGEST_FIELD_ALIGNMENT
===================================================================
@@ -246,7 +246,7 @@
/* PowerPC64 Linux word-aligns FP doubles when -malign-power is given. */
#undef ADJUST_FIELD_ALIGN
#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
- ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE) \
+ (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED)) \
? 128 \
: (TARGET_64BIT \
&& TARGET_ALIGN_NATURAL == 0 \
===================================================================
@@ -367,7 +367,7 @@
/* PowerPC64 Linux word-aligns FP doubles when -malign-power is given. */
#undef ADJUST_FIELD_ALIGN
#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
- ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE) \
+ (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED)) \
? 128 \
: (TARGET_64BIT \
&& TARGET_ALIGN_NATURAL == 0 \
===================================================================
@@ -0,0 +1,9 @@
+/* { dg-do compile { target { powerpc*-*-linux* && lp64 } } } */
+/* { dg-require-effective-target powerpc_altivec_ok } */
+/* { dg-options "-maltivec" } */
+
+struct test
+ {
+ int a __attribute__((vector_size (8)));
+ }; /* { dg-message "note: the layout of aggregates containing vectors with 8-byte alignment has changed" } */
+