rs6000.c (rs6000_emit_set_long_const): Shorten sequence for DImode constants >=…

rs6000.c (rs6000_emit_set_long_const): Shorten sequence for DImode constants >= 0x80000000UL <= 0xFFFFFFFFUL by 1 insn.

	* config/rs6000/rs6000.c (rs6000_emit_set_long_const): Shorten
	sequence for DImode constants >= 0x80000000UL <= 0xFFFFFFFFUL by
	1 insn.
	(num_insns_constant_wide): Adjust for that change.

From-SVN: r155770

gcc/ChangeLog

+2010-01-09  Jakub Jelinek  <jakub@redhat.com>
+
+	* config/rs6000/rs6000.c (rs6000_emit_set_long_const): Shorten
+	sequence for DImode constants >= 0x80000000UL <= 0xFFFFFFFFUL by
+	1 insn.
+	(num_insns_constant_wide): Adjust for that change.
+
 2010-01-09  Alexandre Oliva  <aoliva@redhat.com>
 
 	PR debug/42631

gcc/config/rs6000/rs6000.c

@@ -3794,6 +3794,8 @@ num_insns_constant_wide (HOST_WIDE_INT value)
 
       if (low == 0)
 	return num_insns_constant_wide (high) + 1;
+      else if (high == 0)
+	return num_insns_constant_wide (low) + 1;
       else
 	return (num_insns_constant_wide (high)
 		+ num_insns_constant_wide (low) + 1);
@@ -6143,6 +6145,20 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c1, HOST_WIDE_INT c2)
 			    gen_rtx_IOR (DImode, copy_rtx (dest),
 					 GEN_INT (ud1)));
 	}
+      else if (ud3 == 0 && ud4 == 0)
+	{
+	  gcc_assert (ud2 & 0x8000);
+	  emit_move_insn (dest, GEN_INT (((ud2 << 16) ^ 0x80000000)
+					 - 0x80000000));
+	  if (ud1 != 0)
+	    emit_move_insn (copy_rtx (dest),
+			    gen_rtx_IOR (DImode, copy_rtx (dest),
+					 GEN_INT (ud1)));
+	  emit_move_insn (copy_rtx (dest),
+			  gen_rtx_ZERO_EXTEND (DImode,
+					       gen_lowpart (SImode,
+							    copy_rtx (dest))));
+	}
       else if ((ud4 == 0xffff && (ud3 & 0x8000))
 	       || (ud4 == 0 && ! (ud3 & 0x8000)))
 	{