re PR target/65569 (Fix for PR target/65240 causes a regression in building Spec…

re PR target/65569 (Fix for PR target/65240 causes a regression in building Spec for power4/power5/power6)

2015-03-25  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/65569
	* config/rs6000/rs6000.md (extenddftf2_fprs): On VSX systems use
	XXLXOR to create 0.0.  On pre-VSX systems make sure the constant
	0.0 is correctly setup.
	(extenddftf2_internal): Likewise.

From-SVN: r221683

gcc/ChangeLog

+2015-03-25  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	PR target/65569
+	* config/rs6000/rs6000.md (extenddftf2_fprs): On VSX systems use
+	XXLXOR to create 0.0.  On pre-VSX systems make sure the constant
+	0.0 is correctly setup.
+	(extenddftf2_internal): Likewise.
+
 2015-03-25  Sebastian Pop  <s.pop@samsung.com>
 
 	PR tree-optimization/65177

gcc/config/rs6000/rs6000.md

@@ -8357,16 +8357,21 @@
    && TARGET_HARD_FLOAT && TARGET_FPRS && TARGET_DOUBLE_FLOAT 
    && TARGET_LONG_DOUBLE_128"
 {
-  operands[2] = CONST0_RTX (DFmode);
-  /* Generate GOT reference early for SVR4 PIC.  */
-  if (DEFAULT_ABI == ABI_V4 && flag_pic)
-    operands[2] = validize_mem (force_const_mem (DFmode, operands[2]));
+  /* VSX can create 0.0 directly, otherwise let rs6000_emit_move create
+     the proper constant.  */
+  if (TARGET_VSX)
+    operands[2] = CONST0_RTX (DFmode);
+  else
+    {
+      operands[2] = gen_reg_rtx (DFmode);
+      rs6000_emit_move (operands[2], CONST0_RTX (DFmode), DFmode);
+    }
 })
 
 (define_insn_and_split "*extenddftf2_internal"
-  [(set (match_operand:TF 0 "nonimmediate_operand" "=m,Y,d,&d,r")
-       (float_extend:TF (match_operand:DF 1 "input_operand" "d,r,md,md,rm")))
-   (use (match_operand:DF 2 "zero_reg_mem_operand" "d,r,m,d,n"))]
+  [(set (match_operand:TF 0 "nonimmediate_operand" "=m,Y,ws,d,&d,r")
+       (float_extend:TF (match_operand:DF 1 "input_operand" "d,r,md,md,md,rm")))
+   (use (match_operand:DF 2 "zero_reg_mem_operand" "d,r,j,m,d,n"))]
   "!TARGET_IEEEQUAD
    && TARGET_HARD_FLOAT && TARGET_FPRS && TARGET_DOUBLE_FLOAT 
    && TARGET_LONG_DOUBLE_128"