cse.c (constant_pool_entries_regcost): New global variable to hold the register…

cse.c (constant_pool_entries_regcost): New global variable to hold the register cost component of...


	* cse.c (constant_pool_entries_regcost): New global variable to
	hold the register cost component of constant_pool_entries_cost.
	(fold_rtx): Calculate constant_pool_entries_regcost at the same
	time as constant_pool_entries_cost.
	(cse_insn): Set both src_folded_cost and src_folded_regcost from
	constant_pool_entries_cost and constant_pool_entries_regcost.
	(cse_main): Initialize constant_pool_entries_regcost to zero.

	* optabs.c (expand_unop): Attach a REG_EQUAL note describing
	the semantics of the sequence of bit operations used to negate
	a floating-point value.
	(expand_abs_nojump): Likewise attach a REG_EQUAL note describing
	the semantics of the bit operations used to abs a floating point
	value.

From-SVN: r72326

gcc/ChangeLog

+2003-10-10  Roger Sayle  <roger@eyesopen.com>
+
+	* cse.c (constant_pool_entries_regcost): New global variable to
+	hold the register cost component of constant_pool_entries_cost.
+	(fold_rtx): Calculate constant_pool_entries_regcost at the same
+	time as constant_pool_entries_cost.
+	(cse_insn): Set both src_folded_cost and src_folded_regcost from
+	constant_pool_entries_cost and constant_pool_entries_regcost.
+	(cse_main): Initialize constant_pool_entries_regcost to zero.
+
+	* optabs.c (expand_unop): Attach a REG_EQUAL note describing
+	the semantics of the sequence of bit operations used to negate
+	a floating-point value.
+	(expand_abs_nojump): Likewise attach a REG_EQUAL note describing
+	the semantics of the bit operations used to abs a floating point
+	value.
+
 2003-10-11  Bernardo Innocenti  <bernie@develer.com>
 	    Paul Dale  <pauli@snapgear.com>
 

gcc/cse.c

@@ -569,6 +569,7 @@ static struct table_elt *last_jump_equiv_class;
    the insn.  */
 
 static int constant_pool_entries_cost;
+static int constant_pool_entries_regcost;
 
 /* This data describes a block that will be processed by cse_basic_block.  */
 
@@ -3529,7 +3530,10 @@ fold_rtx (rtx x, rtx insn)
 	    rtx new;
 
 	    if (CONSTANT_P (constant) && GET_CODE (constant) != CONST_INT)
-	      constant_pool_entries_cost = COST (constant);
+	      {
+		constant_pool_entries_cost = COST (constant);
+		constant_pool_entries_regcost = approx_reg_cost (constant);
+	      }
 
 	    /* If we are loading the full constant, we have an equivalence.  */
 	    if (offset == 0 && mode == const_mode)
@@ -5507,6 +5511,7 @@ cse_insn (rtx insn, rtx libcall_insn)
 	      src_folded_force_flag = 1;
 	      src_folded = trial;
 	      src_folded_cost = constant_pool_entries_cost;
+	      src_folded_regcost = constant_pool_entries_regcost;
 	    }
 	}
 
@@ -6939,6 +6944,7 @@ cse_main (rtx f, int nregs, int after_loop, FILE *file)
   cse_jumps_altered = 0;
   recorded_label_ref = 0;
   constant_pool_entries_cost = 0;
+  constant_pool_entries_regcost = 0;
   val.path_size = 0;
 
   init_recog ();

gcc/optabs.c

@@ -2615,7 +2615,16 @@ expand_unop (enum machine_mode mode, optab unoptab, rtx op0, rtx target,
 			       immed_double_const (lo, hi, imode),
 			       NULL_RTX, 1, OPTAB_LIB_WIDEN);
 	  if (temp != 0)
-	    return gen_lowpart (mode, temp);
+	    {
+	      rtx insn;
+	      if (target == 0)
+		target = gen_reg_rtx (mode);
+	      insn = emit_move_insn (target, gen_lowpart (mode, temp));
+	      set_unique_reg_note (insn, REG_EQUAL,
+				   gen_rtx_fmt_e (NEG, mode,
+						  copy_rtx (op0)));
+	      return target;
+	    }
 	  delete_insns_since (last);
         }
     }
@@ -2790,7 +2799,16 @@ expand_abs_nojump (enum machine_mode mode, rtx op0, rtx target,
 			       immed_double_const (~lo, ~hi, imode),
 			       NULL_RTX, 1, OPTAB_LIB_WIDEN);
 	  if (temp != 0)
-	    return gen_lowpart (mode, temp);
+	    {
+	      rtx insn;
+	      if (target == 0)
+		target = gen_reg_rtx (mode);
+	      insn = emit_move_insn (target, gen_lowpart (mode, temp));
+	      set_unique_reg_note (insn, REG_EQUAL,
+				   gen_rtx_fmt_e (ABS, mode,
+						  copy_rtx (op0)));
+	      return target;
+	    }
 	  delete_insns_since (last);
 	}
     }