Makefile.in: Add rules for regrename.o

	* Makefile.in: Add rules for regrename.o
	* regrename.c: New file.
	* rtl.h (regrename_optimize): Add prototype.
	* toplev.c (rename_registers_dump, flag_rename_registers): New variables
	(compile_file, decode_d_option): Add support for -frename-registers.
	(rest_of_compilation): Call regrename_optimize.
	* config/ia64/ia64.h (HARD_REGNO_RENAME_OK, RENAME_EXTENDED_BLOCKS):
	New macros.

From-SVN: r32916

gcc/ChangeLog

+2000-04-04  Stan Cox  <scox@cygnus.com>	
+
+	* Makefile.in: Add rules for regrename.o
+	* regrename.c: New file.
+	* rtl.h (regrename_optimize): Add prototype.
+	* toplev.c (rename_registers_dump, flag_rename_registers): New variables
+	(compile_file, decode_d_option): Add support for -frename-registers.
+	(rest_of_compilation): Call regrename_optimize.
+	* config/ia64/ia64.h (HARD_REGNO_RENAME_OK, RENAME_EXTENDED_BLOCKS):
+	New macros.	
+	
 2000-04-04  Martin v. Lwis  <loewis@informatik.hu-berlin.de>
 
 	* Makefile (gccbug): New target.

gcc/Makefile.in

@@ -675,7 +675,7 @@ OBJS = diagnostic.o \
  dbxout.o sdbout.o dwarfout.o dwarf2out.o xcoffout.o bitmap.o alias.o gcse.o \
  integrate.o jump.o cse.o loop.o unroll.o flow.o combine.o varray.o \
  regclass.o regmove.o local-alloc.o global.o reload.o reload1.o caller-save.o \
- insn-peep.o reorg.o haifa-sched.o final.o recog.o reg-stack.o \
+ insn-peep.o reorg.o haifa-sched.o final.o recog.o reg-stack.o regrename.o \
  insn-opinit.o insn-recog.o insn-extract.o insn-output.o insn-emit.o lcm.o \
  profile.o insn-attrtab.o $(out_object_file) $(EXTRA_OBJS) convert.o \
  mbchar.o dyn-string.o splay-tree.o graph.o sbitmap.o resource.o hash.o \
@@ -1653,6 +1653,10 @@ bb-reorder.o : bb-reorder.c $(CONFIG_H) system.h $(RTL_H) $(TREE_H) flags.h \
    insn-config.h $(BASIC_BLOCK_H) $(REGS_H) hard-reg-set.h output.h toplev.h \
    $(RECOG_H) insn-flags.h function.h except.h $(EXPR_H)
 
+regrename.o : regrename.c $(CONFIG_H) system.h $(RTL_H) $(TREE_H) flags.h \
+   insn-config.h $(BASIC_BLOCK_H) $(REGS_H) hard-reg-set.h output.h \
+   $(RECOG_H) function.h resource.h
+
 $(out_object_file): $(out_file) $(CONFIG_H) $(TREE_H) ggc.h \
    $(RTL_H) $(REGS_H) hard-reg-set.h real.h insn-config.h conditions.h \
    insn-flags.h output.h insn-attr.h insn-codes.h system.h toplev.h function.h

gcc/config/ia64/ia64.h

@@ -2590,6 +2590,25 @@ do {									\
 #define REAL_ARITHMETIC
 
 
+/* Register Renaming Parameters.  */
+
+/* A C expression that is nonzero if hard register number REGNO2 can be
+   considered for use as a rename register for REGNO1 */
+
+#define HARD_REGNO_RENAME_OK(REGNO1,REGNO2) \
+  ((! PR_REGNO_P (REGNO1) && ! PR_REGNO_P (REGNO2)) 			\
+    ? (!call_fixed_regs [REGNO1] && !call_fixed_regs [REGNO2])		\
+      ? 1 : 0    							\
+    : ((REGNO2) > 256 && ((REGNO2 & 1) == 0))				\
+      ? 1 : 0)
+
+/* Define this macro if the compiler should use extended basic blocks
+   when renaming registers.  Define this macro if the target has predicate
+   registers.  */
+
+#define RENAME_EXTENDED_BLOCKS
+
+
 /* Miscellaneous Parameters.  */
 
 /* Define this if you have defined special-purpose predicates in the file

gcc/rtl.h

@@ -1798,4 +1798,8 @@ extern void convert_from_ssa		PARAMS ((void));
 
 extern rtx stack_limit_rtx;
 
+/* In regrename.c */
+
+extern void regrename_optimize		PARAMS ((void));
+
 #endif /* _RTL_H */

gcc/toplev.c

@@ -270,6 +270,7 @@ enum dump_file_index
   DFI_peephole2,
   DFI_sched2,
   DFI_bbro,
+  DFI_rnreg,
   DFI_jump2,
   DFI_mach,
   DFI_dbr,
@@ -302,6 +303,7 @@ struct dump_file_info dump_file[DFI_MAX] =
   { "peephole2", 'z', 1, 0, 0 },
   { "sched2",	'R', 1, 0, 0 },
   { "bbro",	'B', 1, 0, 0 },
+  { "rnreg",	'n', 1, 0, 0 },
   { "jump2",	'J', 1, 0, 0 },
   { "mach",	'M', 1, 0, 0 },
   { "dbr",	'd', 0, 0, 0 },
@@ -423,6 +425,10 @@ int flag_branch_probabilities = 0;
 
 int flag_reorder_blocks = 0;
 
+/* Nonzero if registers should be renamed */
+
+int flag_rename_registers = 0;
+
 /* Nonzero for -pedantic switch: warn about anything
    that standard spec forbids.  */
 
@@ -1019,6 +1025,8 @@ lang_independent_options f_options[] =
    "Use profiling information for branch probabilities" },
   {"reorder-blocks", &flag_reorder_blocks, 1,
    "Reorder basic blocks to improve code placement" },
+  {"rename-registers", &flag_rename_registers, 1,
+   "Do the register renaming optimization pass"},
   {"fast-math", &flag_fast_math, 1,
    "Improve FP speed by violating ANSI & IEEE rules" },
   {"common", &flag_no_common, 0,
@@ -1415,6 +1423,7 @@ int peephole2_time;
 int sched2_time;
 int dbr_sched_time;
 int reorder_blocks_time;
+int rename_registers_time;
 int shorten_branch_time;
 int stack_reg_time;
 int final_time;
@@ -2164,6 +2173,7 @@ compile_file (name)
   sched2_time = 0;
   dbr_sched_time = 0;
   reorder_blocks_time = 0;
+  rename_registers_time = 0;
   shorten_branch_time = 0;
   stack_reg_time = 0;
   final_time = 0;
@@ -2572,6 +2582,7 @@ compile_file (name)
       print_time ("dbranch", dbr_sched_time);
 #endif
       print_time ("bbro", reorder_blocks_time);
+      print_time ("rnreg", rename_registers_time);
       print_time ("shorten-branch", shorten_branch_time);
 #ifdef STACK_REGS
       print_time ("stack-reg", stack_reg_time);
@@ -3421,6 +3432,15 @@ rest_of_compilation (decl)
       close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
     }    
 
+  if (optimize > 0 && flag_rename_registers)
+    {
+      open_dump_file (DFI_rnreg, decl);
+
+      TIMEVAR (rename_registers_time, regrename_optimize ());
+
+      close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
+    }    
+
   /* One more attempt to remove jumps to .+1 left by dead-store elimination. 
      Also do cross-jumping this time and delete no-op move insns.  */