File nvl425788.patch of Package gcc43
2008-07-30 Nathan Froyd <froydnj@codesourcery.com>
PR target/35866
* config/rs6000/rs6000.h (SLOW_UNALIGNED_ACCESS): Add clause for
vector modes.
Index: gcc/config/rs6000/rs6000.h
===================================================================
--- gcc.orig/config/rs6000/rs6000.h 2008-09-10 16:22:31.000000000 -0300
+++ gcc/config/rs6000/rs6000.h 2008-09-10 16:55:58.000000000 -0300
@@ -619,12 +619,15 @@
/* Define this macro to be the value 1 if unaligned accesses have a cost
many times greater than aligned accesses, for example if they are
emulated in a trap handler. */
+/* Altivec vector memory instructions simply ignore the low bits; SPE
+ vector memory instructions trap on unaligned accesses. */
#define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) \
(STRICT_ALIGNMENT \
|| (((MODE) == SFmode || (MODE) == DFmode || (MODE) == TFmode \
|| (MODE) == SDmode || (MODE) == DDmode || (MODE) == TDmode \
|| (MODE) == DImode) \
- && (ALIGN) < 32))
+ && (ALIGN) < 32) \
+ || (VECTOR_MODE_P ((MODE)) && (ALIGN) < GET_MODE_BITSIZE ((MODE))))
/* Standard register usage. */