2007-08-24 Sandra Loosemore <sandra@codesourcery.com>

            Nigel Stephens <nigel@mips.com>

	PR target/11787

	gcc/

	* doc/tm.texi (SET_RATIO, SET_BY_PIECES_P): Document new macros.
	(STORE_BY_PIECES_P): No longer applies to __builtin_memset.
	* expr.c (SET_BY_PIECES_P): Define.
	(can_store_by_pieces, store_by_pieces): Add MEMSETP argument; use
	it to decide whether to use SET_BY_PIECES_P or STORE_BY_PIECES_P.
	(store_expr):  Pass MEMSETP argument to can_store_by_pieces and
	store_by_pieces.
	* expr.h (SET_RATIO): Define.
	(can_store_by_pieces, store_by_pieces):	Update prototypes.
	* builtins.c (expand_builtin_memcpy): Pass MEMSETP argument to
	can_store_by_pieces/store_by_pieces.
	(expand_builtin_memcpy_args): Likewise.
	(expand_builtin_strncpy): Likewise.
	(expand_builtin_memset_args): Likewise.  Also remove special case
	for optimize_size so that can_store_by_pieces/SET_BY_PIECES_P can
	decide what to do instead.
	* value-prof.c (tree_stringops_transform): Pass MEMSETP argument
	to can_store_by_pieces.

	* config/sh/sh.h (SET_BY_PIECES_P): Clone from STORE_BY_PIECES_P.
	* config/s390/s390.h (SET_BY_PIECES_P): Likewise.

	* config/mips/mips.opt (mmemcpy): Change from Var to Mask.
	* config/mips/mips.c (override_options): Make -Os default to -mmemcpy.
	* config/mips/mips.h (MIPS_CALL_RATIO): Define.
	(MOVE_RATIO, CLEAR_RATIO, SET_RATIO): Define.
	(STORE_BY_PIECES_P): Define.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@127790 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 13 insertions, 3 deletions

diff --git a/gcc/expr.h b/gcc/expr.h
index 242329a37be..24a391cc7f6 100644
--- a/gcc/expr.h
+++ b/gcc/expr.h
@@ -84,6 +84,13 @@ enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
 #define CLEAR_RATIO (optimize_size ? 3 : 15)
 #endif
 #endif
+
+/* If a memory set (to value other than zero) operation would take
+   SET_RATIO or more simple move-instruction sequences, we will do a movmem
+   or libcall instead.  */
+#ifndef SET_RATIO
+#define SET_RATIO MOVE_RATIO
+#endif
 
 enum direction {none, upward, downward};
 
@@ -444,20 +451,23 @@ extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
    CONSTFUN with several move instructions by store_by_pieces
    function.  CONSTFUNDATA is a pointer which will be passed as argument
    in every CONSTFUN call.
-   ALIGN is maximum alignment we can assume.  */
+   ALIGN is maximum alignment we can assume.
+   MEMSETP is true if this is a real memset/bzero, not a copy
+   of a const string.  */
 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
 				rtx (*) (void *, HOST_WIDE_INT,
 					 enum machine_mode),
-				void *, unsigned int);
+				void *, unsigned int, bool);
 
 /* Generate several move instructions to store LEN bytes generated by
    CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
    pointer which will be passed as argument in every CONSTFUN call.
    ALIGN is maximum alignment we can assume.
+   MEMSETP is true if this is a real memset/bzero, not a copy.
    Returns TO + LEN.  */
 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
 			    rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
-			    void *, unsigned int, int);
+			    void *, unsigned int, bool, int);
 
 /* Emit insns to set X from Y.  */
 extern rtx emit_move_insn (rtx, rtx);