implicit-zee.c: New file.

	* implicit-zee.c: New file.
	* tree-pass.h (pass_implicit_zee): Declare.
	* passes.c (init_optimization_passes): Add zee pass.
	* common.opt (fzee): New flag.
	* timevar.def (TV_ZEE): Define.
	* config/i386/i386.c (optimization_options): Turn on ZEE for level 2
	and beyond.
	* Makefile.in (implicit-zee.o): Add new build file.
	* gcc.target/i386/zee.c: New file.

From-SVN: r159342

gcc/ChangeLog

+2010-05-12  Sriraman Tallam  <tmsriram@google.com>
+
+	* implicit-zee.c: New file.
+	* tree-pass.h (pass_implicit_zee): Declare.
+	* passes.c (init_optimization_passes): Add zee pass.
+	* common.opt (fzee): New flag.
+	* timevar.def (TV_ZEE): Define.
+	* config/i386/i386.c (optimization_options): Turn on ZEE for level 2
+	and beyond.
+	* Makefile.in (implicit-zee.o): Add new build file.
+
 2010-05-12  Kazu Hirata  <kazu@codesourcery.com>
 	    Nathan Froyd  <froydnj@codesourcery.com>
 

gcc/Makefile.in

@@ -1229,6 +1229,7 @@ OBJS-common = \
 	haifa-sched.o \
 	hooks.o \
 	ifcvt.o \
+	implicit-zee.o \
 	init-regs.o \
 	integrate.o \
 	intl.o \
@@ -2977,6 +2978,11 @@ fwprop.o : fwprop.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
 web.o : web.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
    hard-reg-set.h $(FLAGS_H) $(BASIC_BLOCK_H) $(FUNCTION_H) output.h $(TOPLEV_H) \
    insn-config.h $(RECOG_H) $(DF_H) $(OBSTACK_H) $(TIMEVAR_H) $(TREE_PASS_H)
+implicit-zee.o : implicit-zee.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
+   hard-reg-set.h $(FLAGS_H) $(BASIC_BLOCK_H) $(FUNCTION_H) output.h \
+   $(DF_H) $(TIMEVAR_H) tree-pass.h $(RECOG_H) $(EXPR_H) \
+   $(REGS_H) $(TREE_H) $(TM_P_H) insn-config.h $(INSN_ATTR_H) $(REAL_H) $(TOPLEV_H) \
+   $(TARGET_H) $(OPTABS_H) insn-codes.h rtlhooks-def.h $(PARAMS_H) $(CGRAPH_H)
 gcse.o : gcse.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
    $(REGS_H) hard-reg-set.h $(FLAGS_H) $(REAL_H) insn-config.h $(GGC_H) \
    $(RECOG_H) $(EXPR_H) $(BASIC_BLOCK_H) $(FUNCTION_H) output.h $(TOPLEV_H) \

gcc/common.opt

@@ -1147,6 +1147,10 @@ fsee
 Common
 Does nothing.  Preserved for backward compatibility.
 
+fzee
+Common Report Var(flag_zee) Init(0)
+Eliminate redundant zero extensions on targets that support implicit extensions.
+
 fshow-column
 Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
 Show column numbers in diagnostics, when available.  Default on

gcc/config/i386/i386.c

@@ -4289,6 +4289,10 @@ optimization_options (int level, int size ATTRIBUTE_UNUSED)
     flag_schedule_insns = 0;
 #endif
 
+  /* For -O2 and beyond, turn on -fzee for x86_64 target. */
+  if (level > 1 && TARGET_64BIT)
+    flag_zee = 1;
+
   if (TARGET_MACHO)
     /* The Darwin libraries never set errno, so we might as well
        avoid calling them when that's the only reason we would.  */

gcc/passes.c

@@ -1031,6 +1031,7 @@ init_optimization_passes (void)
 	  NEXT_PASS (pass_postreload_cse);
 	  NEXT_PASS (pass_gcse2);
 	  NEXT_PASS (pass_split_after_reload);
+	  NEXT_PASS (pass_implicit_zee);
 	  NEXT_PASS (pass_branch_target_load_optimize1);
 	  NEXT_PASS (pass_thread_prologue_and_epilogue);
 	  NEXT_PASS (pass_rtl_dse2);

gcc/testsuite/ChangeLog

+2010-05-12  Sriraman Tallam  <tmsriram@google.com>
+
+	* gcc.target/i386/zee.c: New file.
+
 2010-05-12  Jason Merrill  <jason@redhat.com>
 
 	* g++.dg/conversion/op1.C: Expect template candidate message.

gcc/testsuite/gcc.target/i386/zee.c

+/* { dg-do compile } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-options "-O2 -fzee -S" } */
+/* { dg-final { scan-assembler-not "mov\[\\t \]+\(%\[\^,\]+\),\[\\t \]*\\1" } } */
+int mask[100];
+int foo(unsigned x)
+{
+  if (x < 10)
+    x = x * 45;
+  else
+    x = x * 78;
+  return mask[x];
+}

gcc/timevar.def

 /* This file contains the definitions for timing variables used to
    measure run-time performance of the compiler.
-   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+   2009, 2010
    Free Software Foundation, Inc.
    Contributed by Alex Samuel <samuel@codesourcery.com>
 
@@ -207,6 +208,7 @@ DEFTIMEVAR (TV_RELOAD	   	     , "reload")
 DEFTIMEVAR (TV_RELOAD_CSE_REGS       , "reload CSE regs")
 DEFTIMEVAR (TV_SEQABSTR              , "sequence abstraction")
 DEFTIMEVAR (TV_GCSE_AFTER_RELOAD      , "load CSE after reload")
+DEFTIMEVAR (TV_ZEE		     , "zee")
 DEFTIMEVAR (TV_THREAD_PROLOGUE_AND_EPILOGUE, "thread pro- & epilogue")
 DEFTIMEVAR (TV_IFCVT2		     , "if-conversion 2")
 DEFTIMEVAR (TV_COMBINE_STACK_ADJUST  , "combine stack adjustments")

gcc/tree-pass.h

@@ -515,6 +515,7 @@ extern struct rtl_opt_pass pass_stack_ptr_mod;
 extern struct rtl_opt_pass pass_initialize_regs;
 extern struct rtl_opt_pass pass_combine;
 extern struct rtl_opt_pass pass_if_after_combine;
+extern struct rtl_opt_pass pass_implicit_zee;
 extern struct rtl_opt_pass pass_partition_blocks;
 extern struct rtl_opt_pass pass_match_asm_constraints;
 extern struct rtl_opt_pass pass_regmove;