expr.c (expand_expr): Change ">" to ">=" making MOVE_RATIO use consistent.

        * expr.c (expand_expr): Change ">" to ">=" making MOVE_RATIO use
        consistent.
        * tm.texi (Costs): Say MOVE_RATIO is number of mem-mem move
        *sequences* *below* which scalar moves will be used.

From-SVN: r22107

gcc/ChangeLog

+Sun Aug 30 20:19:43 1998  Hans-Peter Nilsson  <hp@axis.se>
+
+	* expr.c (expand_expr): Change ">" to ">=" making MOVE_RATIO use
+	consistent.
+	* tm.texi (Costs): Say MOVE_RATIO is number of mem-mem move
+	*sequences* *below* which scalar moves will be used.
+
 Sun Aug 30 17:18:43 1998  Jeffrey A Law  (law@cygnus.com)
 
 	* collect2.c (mktemp): Delete unused declaration.

gcc/expr.c

@@ -5889,7 +5889,7 @@ expand_expr (exp, target, tmode, modifier)
 			&& (move_by_pieces_ninsns
 			    (TREE_INT_CST_LOW (TYPE_SIZE (type))/BITS_PER_UNIT,
 			     TYPE_ALIGN (type) / BITS_PER_UNIT)
-			    > MOVE_RATIO)
+			    >= MOVE_RATIO)
 			&& ! mostly_zeros_p (exp))))
 	       || (modifier == EXPAND_INITIALIZER && TREE_CONSTANT (exp)))
 	{

gcc/tm.texi

@@ -4727,10 +4727,14 @@ than good.)
 
 @findex MOVE_RATIO
 @item MOVE_RATIO
-The number of scalar move insns which should be generated instead of a
+The threshold of number of scalar memory-to-memory move insns, @emph{below}
+which a sequence of insns  should be generated instead of a
 string move insn or a library call.  Increasing the value will always
 make code faster, but eventually incurs high cost in increased code size.
 
+Note that on machines with no memory-to-memory move insns, this macro denotes
+the corresponding number of memory-to-memory @emph{sequences}.
+
 If you don't define this, a reasonable default is used.
 
 @findex NO_FUNCTION_CSE