s390.c: (optimization_options): Enable TARGET_MVCLE at -Os.

2005-07-07  Adrian Straetling  <straetling@de.ibm.com>

	* config/s390/s390.c: (optimization_options): Enable
	TARGET_MVCLE at -Os.
	* doc/invoke.texi: Document changes in default behaviour.
	* config/s390/s390.opt: ("mvcle"): Fix typo: is "mmvcle".

From-SVN: r101704

gcc/ChangeLog

 2005-07-07  Adrian Straetling  <straetling@de.ibm.com>
+	
+	* config/s390/s390.c: (optimization_options): Enable
+	TARGET_MVCLE at -Os.
+	* doc/invoke.texi: Document changes in default behaviour.
+	* config/s390/s390.opt: ("mvcle"): Fix typo: is "mmvcle".
+
+2005-07-07  Adrian Straetling  <straetling@de.ibm.com>
 
 	* expr.c: (set_storage_via_setmem): Convert opchar to mode
 	defined by back-end.

gcc/config/s390/s390.c

@@ -1107,6 +1107,10 @@ optimization_options (int level ATTRIBUTE_UNUSED, int size ATTRIBUTE_UNUSED)
   /* By default, always emit DWARF-2 unwind info.  This allows debugging
      without maintaining a stack frame back-chain.  */
   flag_asynchronous_unwind_tables = 1;
+
+  /* Use MVCLE instructions to decrease code size if requested.  */
+  if (size != 0)
+    target_flags |= MASK_MVCLE;
 }
 
 /* Return true if ARG is the name of a processor.  Set *TYPE and *FLAGS

gcc/config/s390/s390.opt

@@ -79,7 +79,7 @@ mtune=
 Target RejectNegative Joined
 Schedule code for given CPU
 
-mvcle
+mmvcle
 Target Report Mask(MVCLE)
 mvcle use
 

gcc/doc/invoke.texi

@@ -11433,7 +11433,8 @@ to the GNU/Linux for zSeries ABI, the default is @option{-mzarch}.
 @opindex mno-mvcle
 Generate (or do not generate) code using the @code{mvcle} instruction
 to perform block moves.  When @option{-mno-mvcle} is specified,
-use a @code{mvc} loop instead.  This is the default.
+use a @code{mvc} loop instead.  This is the default unless optimizing for
+size.
 
 @item -mdebug
 @itemx -mno-debug