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gcc.local_unaligned_altivec
Optimization:
On Altivec targets, make all char arrays 128 bits aligned (instead of
32 bits aligned)
--- gcc-4.5.0/gcc/config/rs6000/rs6000.h-orig 2010-10-20 10:23:52.000000000 -0500
+++ gcc-4.5.0/gcc/config/rs6000/rs6000.h 2010-10-20 10:39:14.000000000 -0500
@@ -768,7 +768,8 @@
? 64 \
: (TREE_CODE (TYPE) == ARRAY_TYPE \
&& TYPE_MODE (TREE_TYPE (TYPE)) == QImode \
- && (ALIGN) < BITS_PER_WORD) ? BITS_PER_WORD : (ALIGN)))
+ && (ALIGN) < (TARGET_ALTIVEC ? 128 : BITS_PER_WORD)) \
+ ? (TARGET_ALTIVEC ? 128 : BITS_PER_WORD) : (ALIGN)))
/* Nonzero if move instructions will actually fail to work
when given unaligned data. */
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