2000-01-04 David Edelsohn <edelsohn@gnu.org>
+ * rs6000/sysv4.h (ASM_OUTPUT_DEF): Undefine.
+ (HANDLE_PRAGMA_PACK): Undefine.
+ (SLOW_UNALIGNED_ACCESS): Define.
+
+2000-01-04 David Edelsohn <edelsohn@gnu.org>
+
* expmed.c (SLOW_UNALIGNED_ACCESS): Add mode and align parameters
to default definition.
(store_bit_field): Call SLOW_UNALIGNED_ACCESS with mode and alignment.
/* Undefine some things which are defined by the generic svr4.h. */
+#undef ASM_DECLARE_FUNCTION_NAME
#undef ASM_FILE_END
+#undef ASM_OUTPUT_CONSTRUCTOR
+#undef ASM_OUTPUT_DESTRUCTOR
+#undef ASM_OUTPUT_DEF
#undef ASM_OUTPUT_EXTERNAL_LIBCALL
+#undef HANDLE_PRAGMA_PACK
#undef READONLY_DATA_SECTION
#undef SELECT_SECTION
-#undef ASM_DECLARE_FUNCTION_NAME
-#undef ASM_OUTPUT_CONSTRUCTOR
-#undef ASM_OUTPUT_DESTRUCTOR
/* Use the regular svr4 definitions. */
#undef STRICT_ALIGNMENT
#define STRICT_ALIGNMENT (TARGET_STRICT_ALIGN)
+/* 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. */
+#define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) \
+ ((STRICT_ALIGNMENT \
+ || (((MODE) == SFmode || (MODE) == DFmode || (MODE) == DImode) \
+ && (ALIGN) < 4)) ? 1 : 0)
+
/* Alignment in bits of the stack boundary. Note, in order to allow building
one set of libraries with -mno-eabi instead of eabi libraries and non-eabi
versions, just use 64 as the stack boundary. */
Therefore, do not set this macro non-zero if unaligned accesses only add a
cycle or two to the time for a memory access.
-If the value of this macro is always zero, it need not be defined.
+If the value of this macro is always zero, it need not be defined. If
+this macro is defined, it should produce a non-zero value when
+@code{STRICT_ALIGNMENT} is non-zero.
@findex DONT_REDUCE_ADDR
@item DONT_REDUCE_ADDR