Makefile.in (toplev.o): Add value-prof.h dependency.

	* Makefile.in (toplev.o): Add value-prof.h dependency.
	(value-prof.o): Add REGS_H dependency.
	* common.opt (fprofile-values, fvpt): New.
	* flags.h (flag_value_profile_transformations): Declare.
	* opts.c (common_handle_option): Handle -fprofile_values and
	-fvpt.
	* profile.c (branch_prob): Don't remove death notes here.
	* timevar.def (TV_VPT): New.
	* value-prof.c: Include regs.h.
	(insn_divmod_values_to_profile, gen_divmod_fixed_value, gen_mod_pow2,
	gen_mod_subtract, divmod_fixed_value_transform,mod_pow2_value_transform,
	mod_subtract_transform, value_profile_transformations): New.
	(insn_values_to_profile): Call insn_divmod_values_to_profile.
	(find_values_to_profile): Add dumps.
	* value-prof.h (value_profile_transformations): Declare.
	* toplev.c: Include value-prof.h.
	(rest_of_handle_value_profile_transformations): New.
	(enum dump_file_index): Add DFI_vpt.
	(dump_file): Add vpt dump.
	(flag_value_profile_transformations): New.
	(lang_independent_options): Add flag_profile_values and
	flag_value_profile_transformations.
	(rest_of_compilation): Call
	rest_of_handle_value_profile_transformations.
	(process_options): Let -fvpt imply -fprofile-values.
	* doc/invoke.texi (-fvpt): Document.

From-SVN: r72685

gcc/ChangeLog

+2003-10-19  Zdenek Dvorak  <rakdver@atrey.karlin.mff.cuni.cz>
+
+	* Makefile.in (toplev.o): Add value-prof.h dependency.
+	(value-prof.o): Add REGS_H dependency.
+	* common.opt (fprofile-values, fvpt): New.
+	* flags.h (flag_value_profile_transformations): Declare.
+	* opts.c (common_handle_option): Handle -fprofile_values and
+	-fvpt.
+	* profile.c (branch_prob): Don't remove death notes here.
+	* timevar.def (TV_VPT): New.
+	* value-prof.c: Include regs.h.
+	(insn_divmod_values_to_profile, gen_divmod_fixed_value, gen_mod_pow2,
+	gen_mod_subtract, divmod_fixed_value_transform,mod_pow2_value_transform,
+	mod_subtract_transform, value_profile_transformations): New.
+	(insn_values_to_profile): Call insn_divmod_values_to_profile.
+	(find_values_to_profile): Add dumps.
+	* value-prof.h (value_profile_transformations): Declare.
+	* toplev.c: Include value-prof.h.
+	(rest_of_handle_value_profile_transformations): New.
+	(enum dump_file_index): Add DFI_vpt.
+	(dump_file): Add vpt dump.
+	(flag_value_profile_transformations): New.
+	(lang_independent_options): Add flag_profile_values and
+	flag_value_profile_transformations.
+	(rest_of_compilation): Call
+	rest_of_handle_value_profile_transformations.
+	(process_options): Let -fvpt imply -fprofile-values.
+	* doc/invoke.texi (-fvpt): Document.
+
 2003-10-19  Jan Hubicka  <jh@suse.cz>
 
 	* i386.c (print_reg): Do not abort on certain registers.

gcc/Makefile.in

@@ -1499,7 +1499,7 @@ toplev.o : toplev.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) $(RTL_
    function.h flags.h xcoffout.h input.h $(INSN_ATTR_H) output.h $(DIAGNOSTIC_H) \
    debug.h insn-config.h intl.h $(RECOG_H) Makefile toplev.h \
    dwarf2out.h sdbout.h dbxout.h $(EXPR_H) hard-reg-set.h $(BASIC_BLOCK_H) \
-   graph.h $(LOOP_H) except.h $(REGS_H) $(TIMEVAR_H) \
+   graph.h $(LOOP_H) except.h $(REGS_H) $(TIMEVAR_H) value-prof.h \
    ssa.h $(PARAMS_H) $(TM_P_H) reload.h dwarf2asm.h $(TARGET_H) \
    langhooks.h insn-flags.h cfglayout.h real.h cfgloop.h \
    hosthooks.h $(LANGHOOKS_DEF_H) cgraph.h $(COVERAGE_H)
@@ -1653,7 +1653,7 @@ profile.o : profile.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
    toplev.h $(BASIC_BLOCK_H) $(COVERAGE_H) $(TREE_H) value-prof.h
 value-prof.o : value-prof.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
    $(BASIC_BLOCK_H) hard-reg-set.h value-prof.h $(EXPR_H) output.h flags.h \
-   $(RECOG_H) insn-config.h $(OPTABS_H)
+   $(RECOG_H) insn-config.h $(OPTABS_H) $(REGS_H)
 loop.o : loop.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) flags.h $(LOOP_H) \
    insn-config.h $(REGS_H) hard-reg-set.h $(RECOG_H) $(EXPR_H) \
    real.h $(PREDICT_H) $(BASIC_BLOCK_H) function.h cfgloop.h \

gcc/common.opt

@@ -517,6 +517,10 @@ fprofile-arcs
 Common
 Insert arc-based program profiling code
 
+fprofile-values
+Common
+Insert code to profile values of expressions
+
 frandom-seed
 Common
 
@@ -719,6 +723,10 @@ fverbose-asm
 Common
 Add extra commentary to assembler output
 
+fvpt
+Common
+Use expression value profiles in optimizations
+
 fweb
 Common
 Construct webs and split unrelated uses of single variable

gcc/doc/invoke.texi

@@ -264,7 +264,7 @@ in the following sections.
 @xref{Optimize Options,,Options that Control Optimization}.
 @gccoptlist{-falign-functions=@var{n}  -falign-jumps=@var{n} @gol
 -falign-labels=@var{n}  -falign-loops=@var{n}  @gol
--fbranch-probabilities -fprofile-values -fbranch-target-load-optimize @gol
+-fbranch-probabilities -fprofile-values -fvpt -fbranch-target-load-optimize @gol
 -fbranch-target-load-optimize2 -fcaller-saves  -fcprop-registers @gol
 -fcse-follow-jumps  -fcse-skip-blocks  -fdata-sections @gol
 -fdelayed-branch  -fdelete-null-pointer-checks @gol
@@ -4564,6 +4564,16 @@ With @option{-fbranch-probabilities}, it reads back the data gathered
 from profiling values of expressions and adds @samp{REG_VALUE_PROFILE}
 notes to instructions for their later usage in optimizations.
 
+@item -fvpt
+@opindex fvpt
+If combined with @option{-fprofile-arcs}, it instructs the compiler to add
+a code to gather information about values of expressions.
+
+With @option{-fbranch-probabilities}, it reads back the data gathered
+and actually performs the optimizations based on them.
+Currently the optimizations include specialization of division operation
+using the knowledge about the value of the denominator.
+
 @item -fnew-ra
 @opindex fnew-ra
 Use a graph coloring register allocator.  Currently this option is meant

gcc/flags.h

@@ -680,6 +680,9 @@ extern int flag_gcse_sm;
 
 extern int flag_gcse_las;
 
+/* Nonzero if value histograms should be used to optimize code.  */
+extern int flag_value_profile_transformations;
+
 /* Perform branch target register optimization before prologue / epilogue
    threading.  */
 

gcc/opts.c

@@ -1182,6 +1182,14 @@ common_handle_option (size_t scode, const char *arg,
       profile_arc_flag = value;
       break;
 
+    case OPT_fprofile_values:
+      flag_profile_values = value;
+      break;
+
+    case OPT_fvpt:
+      flag_value_profile_transformations = value;
+      break;
+
     case OPT_frandom_seed:
       /* The real switch is -fno-random-seed.  */
       if (value)

gcc/profile.c

@@ -988,8 +988,6 @@ branch_prob (void)
       allocate_reg_info (max_reg_num (), FALSE, FALSE);
     }
 
-  if (flag_profile_values)
-    count_or_remove_death_notes (NULL, 1);
   remove_fake_edges ();
   free_aux_for_edges ();
   /* Re-merge split basic blocks and the mess introduced by

gcc/timevar.def

@@ -72,6 +72,7 @@ DEFTIMEVAR (TV_TRACER                , "tracer")
 DEFTIMEVAR (TV_WEB                   , "web")
 DEFTIMEVAR (TV_CSE2                  , "CSE 2")
 DEFTIMEVAR (TV_BRANCH_PROB           , "branch prediction")
+DEFTIMEVAR (TV_VPT                   , "value profile opts")
 DEFTIMEVAR (TV_FLOW                  , "flow analysis")
 DEFTIMEVAR (TV_COMBINE               , "combiner")
 DEFTIMEVAR (TV_IFCVT		     , "if-conversion")

gcc/toplev.c

@@ -78,6 +78,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #include "cgraph.h"
 #include "opts.h"
 #include "coverage.h"
+#include "value-prof.h"
 
 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
 #include "dwarf2out.h"
@@ -137,6 +138,7 @@ static void rest_of_handle_null_pointer (tree, rtx);
 static void rest_of_handle_addressof (tree, rtx);
 static void rest_of_handle_cfg (tree, rtx);
 static void rest_of_handle_branch_prob (tree, rtx);
+static void rest_of_handle_value_profile_transformations (tree, rtx);
 static void rest_of_handle_if_conversion (tree, rtx);
 static void rest_of_handle_if_after_combine (tree, rtx);
 static void rest_of_handle_tracer (tree, rtx);
@@ -264,6 +266,7 @@ enum dump_file_index
   DFI_bypass,
   DFI_cfg,
   DFI_bp,
+  DFI_vpt,
   DFI_ce1,
   DFI_tracer,
   DFI_web,
@@ -296,7 +299,7 @@ enum dump_file_index
    Remaining -d letters:
 
 	"            m   q         "
-	"         JK   O Q    V  Y "
+	"         JK   O Q       Y "
 */
 
 static struct dump_file_info dump_file[DFI_MAX] =
@@ -318,6 +321,7 @@ static struct dump_file_info dump_file[DFI_MAX] =
   { "bypass",   'G', 1, 0, 0 }, /* Yes, duplicate enable switch.  */
   { "cfg",	'f', 1, 0, 0 },
   { "bp",	'b', 1, 0, 0 },
+  { "vpt",	'V', 1, 0, 0 },
   { "ce1",	'C', 1, 0, 0 },
   { "tracer",	'T', 1, 0, 0 },
   { "web",      'Z', 0, 0, 0 },
@@ -404,6 +408,9 @@ int profile_arc_flag = 0;
 
 int flag_profile_values = 0;
 
+/* Nonzero if value histograms should be used to optimize code.  */
+int flag_value_profile_transformations = 0;
+
 /* Nonzero if generating info for gcov to calculate line test coverage.  */
 
 int flag_test_coverage = 0;
@@ -1110,6 +1117,8 @@ static const lang_independent_options f_options[] =
   {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
   {"non-call-exceptions", &flag_non_call_exceptions, 1 },
   {"profile-arcs", &profile_arc_flag, 1 },
+  {"profile-values", &flag_profile_values, 1 },
+  {"vpt", &flag_value_profile_transformations, 1 },
   {"test-coverage", &flag_test_coverage, 1 },
   {"branch-probabilities", &flag_branch_probabilities, 1 },
   {"profile", &profile_flag, 1 },
@@ -2462,6 +2471,7 @@ rest_of_handle_branch_prob (tree decl, rtx insns)
 
   timevar_push (TV_BRANCH_PROB);
   open_dump_file (DFI_bp, decl);
+
   if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
     branch_prob ();
 
@@ -2481,6 +2491,20 @@ rest_of_handle_branch_prob (tree decl, rtx insns)
   timevar_pop (TV_BRANCH_PROB);
 }
 
+/* Do optimizations based on expression value profiles.  */
+static void
+rest_of_handle_value_profile_transformations (tree decl, rtx insns)
+{
+  open_dump_file (DFI_vpt, decl);
+  timevar_push (TV_VPT);
+
+  if (value_profile_transformations ())
+    cleanup_cfg (CLEANUP_EXPENSIVE);
+
+  timevar_pop (TV_VPT);
+  close_dump_file (DFI_vpt, print_rtl_with_bb, insns);
+}
+
 /* Do control and data flow analysis; write some of the results to the
    dump file.  */
 static void
@@ -3345,7 +3369,18 @@ rest_of_compilation (tree decl)
 
   if (optimize > 0
       || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
-    rest_of_handle_branch_prob (decl, insns);
+    {
+      rest_of_handle_branch_prob (decl, insns);
+
+      if (flag_branch_probabilities
+	  && flag_profile_values
+	  && flag_value_profile_transformations)
+	rest_of_handle_value_profile_transformations (decl, insns);
+
+      /* Remove the death notes created for vpt.  */
+      if (flag_profile_values)
+	count_or_remove_death_notes (NULL, 1);
+    }
 
   if (optimize > 0)
     rest_of_handle_if_conversion (decl, insns);
@@ -4228,6 +4263,9 @@ process_options (void)
   if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
     flag_unit_at_a_time = 0;
 
+  if (flag_value_profile_transformations)
+    flag_profile_values = 1;
+
   /* Warn about options that are not supported on this machine.  */
 #ifndef INSN_SCHEDULING
   if (flag_schedule_insns || flag_schedule_insns_after_reload)

gcc/value-prof.h

@@ -61,3 +61,4 @@ struct histogram_value
 
 extern void find_values_to_profile (unsigned *, struct histogram_value **);
 extern void free_profiled_values (unsigned, struct histogram_value *);
+extern bool value_profile_transformations (void);