revert: rtl.h (struct rtx_def): ...

2013-04-24  Vladimir Makarov  <vmakarov@redhat.com>

	Revert:
	2013-04-24  Vladimir Makarov  <vmakarov@redhat.com>
	* rtl.h (struct rtx_def): ...

From-SVN: r198266

1 files changed, 53 insertions, 128 deletions

diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index d364ef3..2bf1f21 100644
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -135,11 +135,10 @@
    reload insns.  */
 static int bb_reload_num;
 
-/* The current insn being processed and corresponding its single set
-   (NULL otherwise), its data (basic block, the insn data, the insn
-   static data, and the mode of each operand).  */
+/* The current insn being processed and corresponding its data (basic
+   block, the insn data, the insn static data, and the mode of each
+   operand).  */
 static rtx curr_insn;
-static rtx curr_insn_set;
 static basic_block curr_bb;
 static lra_insn_recog_data_t curr_id;
 static struct lra_static_insn_data *curr_static_id;
@@ -699,7 +698,6 @@ match_reload (signed char out, signed char *ins, enum reg_class goal_class,
 	    new_out_reg = gen_lowpart_SUBREG (outmode, reg);
 	  else
 	    new_out_reg = gen_rtx_SUBREG (outmode, reg, 0);
-	  LRA_SUBREG_P (new_out_reg) = 1;
 	  /* If the input reg is dying here, we can use the same hard
 	     register for REG and IN_RTX.  We do it only for original
 	     pseudos as reload pseudos can die although original
@@ -723,7 +721,6 @@ match_reload (signed char out, signed char *ins, enum reg_class goal_class,
 	     it at the end of LRA work.  */
 	  clobber = emit_clobber (new_out_reg);
 	  LRA_TEMP_CLOBBER_P (PATTERN (clobber)) = 1;
-	  LRA_SUBREG_P (new_in_reg) = 1;
 	  if (GET_CODE (in_rtx) == SUBREG)
 	    {
 	      rtx subreg_reg = SUBREG_REG (in_rtx);
@@ -858,34 +855,40 @@ static rtx
 emit_spill_move (bool to_p, rtx mem_pseudo, rtx val)
 {
   if (GET_MODE (mem_pseudo) != GET_MODE (val))
-    {
-      val = gen_rtx_SUBREG (GET_MODE (mem_pseudo),
-			    GET_CODE (val) == SUBREG ? SUBREG_REG (val) : val,
-			    0);
-      LRA_SUBREG_P (val) = 1;
-    }
+    val = gen_rtx_SUBREG (GET_MODE (mem_pseudo),
+			  GET_CODE (val) == SUBREG ? SUBREG_REG (val) : val,
+			  0);
   return (to_p
-          ? gen_move_insn (mem_pseudo, val)
-          : gen_move_insn (val, mem_pseudo));
+	  ? gen_move_insn (mem_pseudo, val)
+	  : gen_move_insn (val, mem_pseudo));
 }
 
 /* Process a special case insn (register move), return true if we
-   don't need to process it anymore.  INSN should be a single set
-   insn.  Set up that RTL was changed through CHANGE_P and macro
-   SECONDARY_MEMORY_NEEDED says to use secondary memory through
-   SEC_MEM_P.  */
+   don't need to process it anymore.  Return that RTL was changed
+   through CHANGE_P and macro SECONDARY_MEMORY_NEEDED says to use
+   secondary memory through SEC_MEM_P.	*/
 static bool
-check_and_process_move (bool *change_p, bool *sec_mem_p ATTRIBUTE_UNUSED)
+check_and_process_move (bool *change_p, bool *sec_mem_p)
 {
   int sregno, dregno;
-  rtx dest, src, dreg, sreg, old_sreg, new_reg, before, scratch_reg;
+  rtx set, dest, src, dreg, sreg, old_sreg, new_reg, before, scratch_reg;
   enum reg_class dclass, sclass, secondary_class;
   enum machine_mode sreg_mode;
   secondary_reload_info sri;
 
-  lra_assert (curr_insn_set != NULL_RTX);
-  dreg = dest = SET_DEST (curr_insn_set);
-  sreg = src = SET_SRC (curr_insn_set);
+  *sec_mem_p = *change_p = false;
+  if ((set = single_set (curr_insn)) == NULL)
+    return false;
+  dreg = dest = SET_DEST (set);
+  sreg = src = SET_SRC (set);
+  /* Quick check on the right move insn which does not need
+     reloads.  */
+  if ((dclass = get_op_class (dest)) != NO_REGS
+      && (sclass = get_op_class (src)) != NO_REGS
+      /* The backend guarantees that register moves of cost 2 never
+	 need reloads.  */
+      && targetm.register_move_cost (GET_MODE (src), dclass, sclass) == 2)
+    return true;
   if (GET_CODE (dest) == SUBREG)
     dreg = SUBREG_REG (dest);
   if (GET_CODE (src) == SUBREG)
@@ -893,6 +896,7 @@ check_and_process_move (bool *change_p, bool *sec_mem_p ATTRIBUTE_UNUSED)
   if (! REG_P (dreg) || ! REG_P (sreg))
     return false;
   sclass = dclass = NO_REGS;
+  dreg = get_equiv_substitution (dreg);
   if (REG_P (dreg))
     dclass = get_reg_class (REGNO (dreg));
   if (dclass == ALL_REGS)
@@ -906,6 +910,7 @@ check_and_process_move (bool *change_p, bool *sec_mem_p ATTRIBUTE_UNUSED)
     return false;
   sreg_mode = GET_MODE (sreg);
   old_sreg = sreg;
+  sreg = get_equiv_substitution (sreg);
   if (REG_P (sreg))
     sclass = get_reg_class (REGNO (sreg));
   if (sclass == ALL_REGS)
@@ -1002,7 +1007,7 @@ check_and_process_move (bool *change_p, bool *sec_mem_p ATTRIBUTE_UNUSED)
       if (GET_CODE (src) == SUBREG)
 	SUBREG_REG (src) = new_reg;
       else
-	SET_SRC (curr_insn_set) = new_reg;
+	SET_SRC (set) = new_reg;
     }
   else
     {
@@ -1199,10 +1204,7 @@ simplify_operand_subreg (int nop, enum machine_mode reg_mode)
        && (hard_regno_nregs[hard_regno][GET_MODE (reg)]
 	   >= hard_regno_nregs[hard_regno][mode])
        && simplify_subreg_regno (hard_regno, GET_MODE (reg),
-				 SUBREG_BYTE (operand), mode) < 0
-       /* Don't reload subreg for matching reload.  It is actually
-	  valid subreg in LRA.  */
-       && ! LRA_SUBREG_P (operand))
+				 SUBREG_BYTE (operand), mode) < 0)
       || CONSTANT_P (reg) || GET_CODE (reg) == PLUS || MEM_P (reg))
     {
       enum op_type type = curr_static_id->operand[nop].type;
@@ -1309,14 +1311,6 @@ general_constant_p (rtx x)
   return CONSTANT_P (x) && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (x));
 }
 
-static bool
-reg_in_class_p (rtx reg, enum reg_class cl)
-{
-  if (cl == NO_REGS)
-    return get_reg_class (REGNO (reg)) == NO_REGS;
-  return in_class_p (reg, cl, NULL);
-}
-
 /* Major function to choose the current insn alternative and what
    operands should be reloaded and how.	 If ONLY_ALTERNATIVE is not
    negative we should consider only this alternative.  Return false if
@@ -1396,7 +1390,7 @@ process_alt_operands (int only_alternative)
   for (nalt = 0; nalt < n_alternatives; nalt++)
     {
       /* Loop over operands for one constraint alternative.  */
-#if HAVE_ATTR_enabled
+#ifdef HAVE_ATTR_enabled
       if (curr_id->alternative_enabled_p != NULL
 	  && ! curr_id->alternative_enabled_p[nalt])
 	continue;
@@ -2060,31 +2054,6 @@ process_alt_operands (int only_alternative)
 	  if (early_clobber_p && operand_reg[nop] != NULL_RTX)
 	    early_clobbered_nops[early_clobbered_regs_num++] = nop;
 	}
-      if (curr_insn_set != NULL_RTX && n_operands == 2
-	  && ((! curr_alt_win[0] && ! curr_alt_win[1]
-	       && REG_P (no_subreg_reg_operand[0])
-	       && REG_P (no_subreg_reg_operand[1])
-	       && (reg_in_class_p (no_subreg_reg_operand[0], curr_alt[1])
-		   || reg_in_class_p (no_subreg_reg_operand[1], curr_alt[0])))
-	      || (! curr_alt_win[0] && curr_alt_win[1]
-		  && REG_P (no_subreg_reg_operand[1])
-		  && reg_in_class_p (no_subreg_reg_operand[1], curr_alt[0]))
-	      || (curr_alt_win[0] && ! curr_alt_win[1]
-		  && REG_P (no_subreg_reg_operand[0])
-		  && reg_in_class_p (no_subreg_reg_operand[0], curr_alt[1])
-		  && (! CONST_POOL_OK_P (curr_operand_mode[1],
-					 no_subreg_reg_operand[1])
-		      || (targetm.preferred_reload_class
-			  (no_subreg_reg_operand[1],
-			   (enum reg_class) curr_alt[1]) != NO_REGS))
-		  /* If it is a result of recent elimination in move
-		     insn we can transform it into an add still by
-		     using this alternative.  */
-		  && GET_CODE (no_subreg_reg_operand[1]) != PLUS)))
-	/* We have a move insn and a new reload insn will be similar
-	   to the current insn.  We should avoid such situation as it
-	   results in LRA cycling.  */
-	overall += LRA_MAX_REJECT;
       ok_p = true;
       curr_alt_dont_inherit_ops_num = 0;
       for (nop = 0; nop < early_clobbered_regs_num; nop++)
@@ -2456,35 +2425,27 @@ process_address (int nop, rtx *before, rtx *after)
       && process_addr_reg (ad.index_term, before, NULL, INDEX_REG_CLASS))
     change_p = true;
 
-#ifdef EXTRA_CONSTRAINT_STR
-  /* Target hooks sometimes reject extra constraint addresses -- use
-     EXTRA_CONSTRAINT_STR for the validation.  */
-  if (constraint[0] != 'p'
-      && EXTRA_ADDRESS_CONSTRAINT (constraint[0], constraint)
-      && EXTRA_CONSTRAINT_STR (op, constraint[0], constraint))
-    return change_p;
-#endif
-
   /* There are three cases where the shape of *AD.INNER may now be invalid:
 
      1) the original address was valid, but either elimination or
-	equiv_address_substitution was applied and that made
-	the address invalid.
+	equiv_address_substitution applied a displacement that made
+	it invalid.
 
      2) the address is an invalid symbolic address created by
 	force_const_to_mem.
 
      3) the address is a frame address with an invalid offset.
 
-     All these cases involve a non-autoinc address, so there is no
-     point revalidating other types.  */
-  if (ad.autoinc_p || valid_address_p (&ad))
+     All these cases involve a displacement and a non-autoinc address,
+     so there is no point revalidating other types.  */
+  if (ad.disp == NULL || ad.autoinc_p || valid_address_p (&ad))
     return change_p;
 
   /* Any index existed before LRA started, so we can assume that the
      presence and shape of the index is valid.  */
   push_to_sequence (*before);
-  lra_assert (ad.disp == ad.disp_term);
+  gcc_assert (ad.segment == NULL);
+  gcc_assert (ad.disp == ad.disp_term);
   if (ad.base == NULL)
     {
       if (ad.index == NULL)
@@ -2492,39 +2453,26 @@ process_address (int nop, rtx *before, rtx *after)
 	  int code = -1;
 	  enum reg_class cl = base_reg_class (ad.mode, ad.as,
 					      SCRATCH, SCRATCH);
-	  rtx addr = *ad.inner;
+	  rtx disp = *ad.disp;
 
-	  new_reg = lra_create_new_reg (Pmode, NULL_RTX, cl, "addr");
+	  new_reg = lra_create_new_reg (Pmode, NULL_RTX, cl, "disp");
 #ifdef HAVE_lo_sum
 	  {
 	    rtx insn;
 	    rtx last = get_last_insn ();
 
-	    /* addr => lo_sum (new_base, addr), case (2) above.  */
+	    /* disp => lo_sum (new_base, disp), case (2) above.  */
 	    insn = emit_insn (gen_rtx_SET
 			      (VOIDmode, new_reg,
-			       gen_rtx_HIGH (Pmode, copy_rtx (addr))));
+			       gen_rtx_HIGH (Pmode, copy_rtx (disp))));
 	    code = recog_memoized (insn);
 	    if (code >= 0)
 	      {
-		*ad.inner = gen_rtx_LO_SUM (Pmode, new_reg, addr);
+		*ad.disp = gen_rtx_LO_SUM (Pmode, new_reg, disp);
 		if (! valid_address_p (ad.mode, *ad.outer, ad.as))
 		  {
-		    /* Try to put lo_sum into register.  */
-		    insn = emit_insn (gen_rtx_SET
-				      (VOIDmode, new_reg,
-				       gen_rtx_LO_SUM (Pmode, new_reg, addr)));
-		    code = recog_memoized (insn);
-		    if (code >= 0)
-		      {
-			*ad.inner = new_reg;
-			if (! valid_address_p (ad.mode, *ad.outer, ad.as))
-			  {
-			    *ad.inner = addr;
-			    code = -1;
-			  }
-		      }
-		    
+		    *ad.disp = disp;
+		    code = -1;
 		  }
 	      }
 	    if (code < 0)
@@ -2533,9 +2481,9 @@ process_address (int nop, rtx *before, rtx *after)
 #endif
 	  if (code < 0)
 	    {
-	      /* addr => new_base, case (2) above.  */
-	      lra_emit_move (new_reg, addr);
-	      *ad.inner = new_reg;
+	      /* disp => new_base, case (2) above.  */
+	      lra_emit_move (new_reg, disp);
+	      *ad.disp = new_reg;
 	    }
 	}
       else
@@ -2702,24 +2650,6 @@ emit_inc (enum reg_class new_rclass, rtx in, rtx value, int inc_amount)
   return result;
 }
 
-/* Return true if the current move insn does not need processing as we
-   already know that it satisfies its constraints.  */
-static bool
-simple_move_p (void)
-{
-  rtx dest, src;
-  enum reg_class dclass, sclass;
-
-  lra_assert (curr_insn_set != NULL_RTX);
-  dest = SET_DEST (curr_insn_set);
-  src = SET_SRC (curr_insn_set);
-  return ((dclass = get_op_class (dest)) != NO_REGS
-	  && (sclass = get_op_class (src)) != NO_REGS
-	  /* The backend guarantees that register moves of cost 2
-	     never need reloads.  */
-	  && targetm.register_move_cost (GET_MODE (src), dclass, sclass) == 2);
- }
-
 /* Swap operands NOP and NOP + 1. */
 static inline void
 swap_operands (int nop)
@@ -2763,13 +2693,12 @@ curr_insn_transform (void)
   int max_regno_before;
   int reused_alternative_num;
 
-  curr_insn_set = single_set (curr_insn);
-  if (curr_insn_set != NULL_RTX && simple_move_p ())
-    return false;
-
   no_input_reloads_p = no_output_reloads_p = false;
   goal_alt_number = -1;
-  change_p = sec_mem_p = false;
+
+  if (check_and_process_move (&change_p, &sec_mem_p))
+    return change_p;
+
   /* JUMP_INSNs and CALL_INSNs are not allowed to have any output
      reloads; neither are insns that SET cc0.  Insns that use CC0 are
      not allowed to have any input reloads.  */
@@ -2864,10 +2793,6 @@ curr_insn_transform (void)
        we chose previously may no longer be valid.  */
     lra_set_used_insn_alternative (curr_insn, -1);
 
-  if (curr_insn_set != NULL_RTX
-      && check_and_process_move (&change_p, &sec_mem_p))
-    return change_p;
-
  try_swapped:
 
   reused_alternative_num = curr_id->used_insn_alternative;
@@ -4896,7 +4821,7 @@ inherit_in_ebb (rtx head, rtx tail)
 /* This value affects EBB forming.  If probability of edge from EBB to
    a BB is not greater than the following value, we don't add the BB
    to EBB.  */
-#define EBB_PROBABILITY_CUTOFF ((REG_BR_PROB_BASE * 50) / 100)
+#define EBB_PROBABILITY_CUTOFF (REG_BR_PROB_BASE / 2)
 
 /* Current number of inheritance/split iteration.  */
 int lra_inheritance_iter;