emit-rtl.c (get_mem_attrs): Don't default alignment for non-BLKmode if not STRICT_ALIGNMENT.

	* emit-rtl.c (get_mem_attrs): Don't default alignment for non-BLKmode
	if not STRICT_ALIGNMENT.
	* rtl.h (MEM_ALIGN): Likewise.

From-SVN: r49268

gcc/ChangeLog

+Sun Jan 27 13:23:40 2002  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
+
+	* emit-rtl.c (get_mem_attrs): Don't default alignment for non-BLKmode
+	if not STRICT_ALIGNMENT.
+	* rtl.h (MEM_ALIGN): Likewise.
+
 2002-01-27  Craig Rodrigues  <rodrigc@gcc.gnu.org>
 
 	* doc/invoke.texi (-fdump-translation-unit): Revert this

gcc/emit-rtl.c

@@ -292,7 +292,8 @@ get_mem_attrs (alias, expr, offset, size, align, mode)
       && (size == 0
 	  || (mode != BLKmode && GET_MODE_SIZE (mode) == INTVAL (size)))
       && (align == BITS_PER_UNIT
-	  || (mode != BLKmode && align == GET_MODE_ALIGNMENT (mode))))
+	  || (STRICT_ALIGNMENT
+	      && mode != BLKmode && align == GET_MODE_ALIGNMENT (mode))))
     return 0;
 
   attrs.alias = alias;

gcc/rtl.h

@@ -926,12 +926,12 @@ do {						\
  : GET_MODE (RTX) != BLKmode ? GEN_INT (GET_MODE_SIZE (GET_MODE (RTX)))	\
  : 0)
 
-/* For a MEM rtx, the alignment in bits.  */
+/* For a MEM rtx, the alignment in bits.  We can use the alignment of the
+   mode as a default when STRICT_ALIGNMENT, but not if not.  */
 #define MEM_ALIGN(RTX)							\
 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->align				\
- : GET_MODE (RTX) != BLKmode ? GET_MODE_ALIGNMENT (GET_MODE (RTX))	\
- : BITS_PER_UNIT)
-
+ : (STRICT_ALIGNMENT && GET_MODE (RTX) != BLKmode			\
+    ? GET_MODE_ALIGNMENT (GET_MODE (RTX)) : BITS_PER_UNIT))
 
 /* Copy the attributes that apply to memory locations from RHS to LHS.  */
 #define MEM_COPY_ATTRIBUTES(LHS, RHS)				\