m68hc11.md ("*ashlsi3"): Avoid saving y if we know it is dead.

	* config/m68hc11/m68hc11.md ("*ashlsi3"): Avoid saving y if we know
	it is dead.
	("*ashrsi3"): Likewise.
	("*lshrsi3"): Likewise.

From-SVN: r55270

gcc/ChangeLog

+2002-07-05  Stephane Carrez  <stcarrez@nerim.fr>
+
+	* config/m68hc11/m68hc11.md ("*ashlsi3"): Avoid saving y if we know
+	it is dead.
+	("*ashrsi3"): Likewise.
+	("*lshrsi3"): Likewise.
+
 2002-07-05  Vladimir Makarov  <vmakarov@redhat.com>
 
 	* genautomata.c (output_max_insn_queue_index_def): Take latencies
 	into account.
 
-2002-07-06  Stephane Carrez  <stcarrez@nerim.fr>
+2002-07-05  Stephane Carrez  <stcarrez@nerim.fr>
 
 	* config/m68hc11/m68hc11.md (peephole2): New peephole2 to optimize
 	address computation and memory moves.

gcc/config/m68hc11/m68hc11.md

@@ -4697,16 +4697,18 @@
   if (!Y_REG_P (operands[2]))
     {
       rtx ops[1];
+      int y_dead = dead_register_here (insn, iy_reg);
 
       ops[0] = operands[1];
-      output_asm_insn (\"pshy\", operands);
-      if (reg_mentioned_p (stack_pointer_rtx, operands[1]))
+      if (y_dead == 0)
 	{
-	  ops[0] = adjust_address (operands[1], GET_MODE (operands[1]), 2);
+          output_asm_insn (\"pshy\", operands);
+          if (reg_mentioned_p (stack_pointer_rtx, operands[1]))
+	    ops[0] = adjust_address (operands[1], GET_MODE (operands[1]), 2);
 	}
       output_asm_insn (\"ldy\\t%0\", ops);
       output_asm_insn (\"bsr\\t___ashlsi3\", operands);
-      return \"puly\";
+      return y_dead == 0 ? \"puly\" : \"\";
     }
   return \"bsr\\t___ashlsi3\";
 }")
@@ -5105,16 +5107,18 @@
   if (!Y_REG_P (operands[2]))
     {
       rtx ops[1];
+      int y_dead = dead_register_here (insn, iy_reg);
 
       ops[0] = operands[1];
-      output_asm_insn (\"pshy\", operands);
-      if (reg_mentioned_p (stack_pointer_rtx, operands[1]))
+      if (y_dead == 0)
 	{
-	  ops[0] = adjust_address (operands[1], GET_MODE (operands[1]), 2);
+          output_asm_insn (\"pshy\", operands);
+          if (reg_mentioned_p (stack_pointer_rtx, operands[1]))
+	    ops[0] = adjust_address (operands[1], GET_MODE (operands[1]), 2);
 	}
       output_asm_insn (\"ldy\\t%0\", ops);
       output_asm_insn (\"bsr\\t___ashrsi3\", operands);
-      return \"puly\";
+      return y_dead == 0 ? \"puly\" : \"\";
     }
   return \"bsr\\t___ashrsi3\";
 }")
@@ -5449,16 +5453,18 @@
   if (!Y_REG_P (operands[2]))
     {
       rtx ops[1];
+      int y_dead = dead_register_here (insn, iy_reg);
 
       ops[0] = operands[1];
-      output_asm_insn (\"pshy\", operands);
-      if (reg_mentioned_p (stack_pointer_rtx, operands[1]))
+      if (y_dead == 0)
 	{
-	  ops[0] = adjust_address (operands[1], GET_MODE (operands[1]), 2);
+          output_asm_insn (\"pshy\", operands);
+          if (reg_mentioned_p (stack_pointer_rtx, operands[1]))
+	    ops[0] = adjust_address (operands[1], GET_MODE (operands[1]), 2);
 	}
       output_asm_insn (\"ldy\\t%0\", ops);
       output_asm_insn (\"bsr\\t___lshrsi3\", operands);
-      return \"puly\";
+      return y_dead == 0 ? \"puly\" : \"\";
     }
   return \"bsr\\t___lshrsi3\";
 }")