rs6000.c (rs6000_emit_set_const): Inline multi-instruction SImode constant.

        * config/rs6000/rs6000.c (rs6000_emit_set_const): Inline
        multi-instruction SImode constant.  Add REG_EQUAL note.
        * config/rs6000/rs6000.md (movsi splitter): Use
        rs6000_emit_set_const.

From-SVN: r56439

gcc/ChangeLog

+2002-08-19  David Edelsohn  <edelsohn@gnu.org>
+
+	* config/rs6000/rs6000.c (rs6000_emit_set_const): Inline
+	multi-instruction SImode constant.  Add REG_EQUAL note.
+	* config/rs6000/rs6000.md (movsi splitter): Use
+	rs6000_emit_set_const. 
+
 2002-08-19  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* tree-inline.c (initialize_inlined_parameters): Wrap variable in

gcc/config/rs6000/rs6000.c

@@ -2368,35 +2368,59 @@ rs6000_emit_set_const (dest, mode, source, n)
      enum machine_mode mode;
      int n ATTRIBUTE_UNUSED;
 {
+  rtx result, insn, set;
   HOST_WIDE_INT c0, c1;
 
-  if (mode == QImode || mode == HImode || mode == SImode)
+  if (mode == QImode || mode == HImode)
     {
       if (dest == NULL)
         dest = gen_reg_rtx (mode);
       emit_insn (gen_rtx_SET (VOIDmode, dest, source));
       return dest;
     }
-
-  if (GET_CODE (source) == CONST_INT)
+  else if (mode == SImode)
     {
-      c0 = INTVAL (source);
-      c1 = -(c0 < 0);
+      result = no_new_pseudos ? dest : gen_reg_rtx (SImode);
+
+      emit_insn (gen_rtx_SET (VOIDmode, result,
+			      GEN_INT (INTVAL (source)
+				       & (~ (HOST_WIDE_INT) 0xffff))));
+      emit_insn (gen_rtx_SET (VOIDmode, dest,
+			      gen_rtx_IOR (SImode, result,
+					   GEN_INT (INTVAL (source) & 0xffff))));
+      result = dest;
     }
-  else if (GET_CODE (source) == CONST_DOUBLE)
+  else if (mode == DImode)
     {
+      if (GET_CODE (source) == CONST_INT)
+	{
+	  c0 = INTVAL (source);
+	  c1 = -(c0 < 0);
+	}
+      else if (GET_CODE (source) == CONST_DOUBLE)
+	{
 #if HOST_BITS_PER_WIDE_INT >= 64
-      c0 = CONST_DOUBLE_LOW (source);
-      c1 = -(c0 < 0);
+	  c0 = CONST_DOUBLE_LOW (source);
+	  c1 = -(c0 < 0);
 #else
-      c0 = CONST_DOUBLE_LOW (source);
-      c1 = CONST_DOUBLE_HIGH (source);
+	  c0 = CONST_DOUBLE_LOW (source);
+	  c1 = CONST_DOUBLE_HIGH (source);
 #endif
+	}
+      else
+	abort ();
+
+      result = rs6000_emit_set_long_const (dest, c0, c1);
     }
   else
     abort ();
 
-  return rs6000_emit_set_long_const (dest, c0, c1);
+  insn = get_last_insn ();
+  set = single_set (insn);
+  if (! CONSTANT_P (SET_SRC (set)))
+    set_unique_reg_note (insn, REG_EQUAL, source);
+
+  return result;
 }
 
 /* Having failed to find a 3 insn sequence in rs6000_emit_set_const,

gcc/config/rs6000/rs6000.md

@@ -8215,9 +8215,12 @@
 	(ior:SI (match_dup 0)
 		(match_dup 3)))]
   "
-{
-  operands[2] = GEN_INT (INTVAL (operands[1]) & (~ (HOST_WIDE_INT) 0xffff));
-  operands[3] = GEN_INT (INTVAL (operands[1]) & 0xffff);
+{ rtx tem = rs6000_emit_set_const (operands[0], SImode, operands[1], 2);
+
+  if (tem == operands[0])
+    DONE;
+  else
+    FAIL;
 }")
 
 (define_insn "*movsi_internal2"