regrename.c (struct du_head): Make nregs signed.

	* regrename.c (struct du_head): Make nregs signed.
	(closed_chains): Remove.
	(create_new_chain): Return the new chain.
	(chain_from_id): New static function.
	(dump_def_use_chain): Change argument to be an int, indicating
	the first ID to print.  All callers changed.
	(merge_overlapping_regs): Use chain_from_id.  Assert that
	chains don't conflict with themselves.
	(rename_chains): Take no argument.  Iterate over id_to_chain
	rather to find chains to rename.  Clear tick before the main
	loop.
	(struct incoming_reg_info): New struct.
	(struct bb_rename_info): New struct.
	(init_rename_info, set_incoming_from_chain, merge_chains): New
	static functions.
	(regrename_analyze): New static function, broken out of
	regrename_optimize.  Record and make use of open chain information
	at basic block boundaries, and merge chains where possible.
	(scan_rtx_reg): Make this_nregs signed.  Don't update
	closed_chains.
	(build_def_use): Return a bool to indicate success.  All callers
	changed.  Don't initialize global data here.
	(regrename_optimize): Move most code out of here into
	regrename_analyze.
	* regs.h (add_range_to_hard_reg_set, remove_range_from_hard_reg_set,
	range_overlaps_hard_reg_set_p, range_in_hard_reg_set_p): New
	static inline functions.
	* vec.h (FOR_EACH_VEC_ELT_FROM): New macro.

From-SVN: r178645

gcc/ChangeLog

+2011-09-07  Bernd Schmidt  <bernds@codesourcery.com>
+
+	* regrename.c (struct du_head): Make nregs signed.
+	(closed_chains): Remove.
+	(create_new_chain): Return the new chain.
+	(chain_from_id): New static function.
+	(dump_def_use_chain): Change argument to be an int, indicating
+	the first ID to print.  All callers changed.
+	(merge_overlapping_regs): Use chain_from_id.  Assert that
+	chains don't conflict with themselves.
+	(rename_chains): Take no argument.  Iterate over id_to_chain
+	rather to find chains to rename.  Clear tick before the main
+	loop.
+	(struct incoming_reg_info): New struct.
+	(struct bb_rename_info): New struct.
+	(init_rename_info, set_incoming_from_chain, merge_chains): New
+	static functions.
+	(regrename_analyze): New static function, broken out of
+	regrename_optimize.  Record and make use of open chain information
+	at basic block boundaries, and merge chains where possible.
+	(scan_rtx_reg): Make this_nregs signed.  Don't update
+	closed_chains.
+	(build_def_use): Return a bool to indicate success.  All callers
+	changed.  Don't initialize global data here.
+	(regrename_optimize): Move most code out of here into
+	regrename_analyze.
+	* regs.h (add_range_to_hard_reg_set, remove_range_from_hard_reg_set,
+	range_overlaps_hard_reg_set_p, range_in_hard_reg_set_p): New
+	static inline functions.
+	* vec.h (FOR_EACH_VEC_ELT_FROM): New macro.
+
 2011-09-07  Martin Jambor  <mjambor@suse.cz>
 
 	PR middle-end/50301

gcc/regs.h

@@ -397,4 +397,48 @@ overlaps_hard_reg_set_p (const HARD_REG_SET regs, enum machine_mode mode,
   return false;
 }
 
+/* Like add_to_hard_reg_set, but use a REGNO/NREGS range instead of
+   REGNO and MODE.  */
+
+static inline void
+add_range_to_hard_reg_set (HARD_REG_SET *regs, unsigned int regno,
+			   int nregs)
+{
+  while (nregs-- > 0)
+    SET_HARD_REG_BIT (*regs, regno + nregs);
+}
+
+/* Likewise, but remove the registers.  */
+
+static inline void
+remove_range_from_hard_reg_set (HARD_REG_SET *regs, unsigned int regno,
+				int nregs)
+{
+  while (nregs-- > 0)
+    CLEAR_HARD_REG_BIT (*regs, regno + nregs);
+}
+
+/* Like overlaps_hard_reg_set_p, but use a REGNO/NREGS range instead of
+   REGNO and MODE.  */
+static inline bool
+range_overlaps_hard_reg_set_p (const HARD_REG_SET set, unsigned regno,
+			       int nregs)
+{
+  while (nregs-- > 0)
+    if (TEST_HARD_REG_BIT (set, regno + nregs))
+      return true;
+  return false;
+}
+
+/* Like in_hard_reg_set_p, but use a REGNO/NREGS range instead of
+   REGNO and MODE.  */
+static inline bool
+range_in_hard_reg_set_p (const HARD_REG_SET set, unsigned regno, int nregs)
+{
+  while (nregs-- > 0)
+    if (!TEST_HARD_REG_BIT (set, regno + nregs))
+      return false;
+  return true;
+}
+
 #endif /* GCC_REGS_H */

gcc/vec.h

@@ -195,6 +195,11 @@ along with GCC; see the file COPYING3.  If not see
 #define FOR_EACH_VEC_ELT(T, V, I, P)		\
   for (I = 0; VEC_iterate (T, (V), (I), (P)); ++(I))
 
+/* Likewise, but start from FROM rather than 0.  */
+
+#define FOR_EACH_VEC_ELT_FROM(T, V, I, P, FROM)		\
+  for (I = (FROM); VEC_iterate (T, (V), (I), (P)); ++(I))
+
 /* Convenience macro for reverse iteration.  */
 
 #define FOR_EACH_VEC_ELT_REVERSE(T,V,I,P) \