[ARC] Fix FPX/FPUDA code gen when compiling for big-endian.

gcc/
2016-04-28  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_process_double_reg_moves): Fix for
	big-endian compilation.
	(arc_rtx_costs): Fix high/low naming.
	* config/arc/arc.md (addf3): Likewise.
	(subdf3): Likewise.
	(muldf3): Likewise.

From-SVN: r235567

gcc/ChangeLog

+2016-04-28  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* config/arc/arc.c (arc_process_double_reg_moves): Fix for
+	big-endian compilation.
+	* config/arc/arc.md (addf3): Likewise.
+	(subdf3): Likewise.
+	(muldf3): Likewise.
+
 2016-04-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/70840

gcc/config/arc/arc.c

@@ -4426,17 +4426,16 @@ arc_rtx_costs (rtx x, machine_mode mode, int outer_code,
 
     case CONST_DOUBLE:
       {
-	rtx high, low;
+	rtx first, second;
 
 	if (TARGET_DPFP)
 	  {
 	    *total = COSTS_N_INSNS (1);
 	    return true;
 	  }
-	/* FIXME: correct the order of high,low */
-	split_double (x, &high, &low);
-	*total = COSTS_N_INSNS (!SMALL_INT (INTVAL (high))
-				+ !SMALL_INT (INTVAL (low)));
+	split_double (x, &first, &second);
+	*total = COSTS_N_INSNS (!SMALL_INT (INTVAL (first))
+				+ !SMALL_INT (INTVAL (second)));
 	return true;
       }
 
@@ -8928,8 +8927,10 @@ arc_process_double_reg_moves (rtx *operands)
 	{
 	  /* When we have 'mov D, r' or 'mov D, D' then get the target
 	     register pair for use with LR insn.  */
-	  rtx destHigh = simplify_gen_subreg(SImode, dest, DFmode, 4);
-	  rtx destLow  = simplify_gen_subreg(SImode, dest, DFmode, 0);
+	  rtx destHigh = simplify_gen_subreg (SImode, dest, DFmode,
+					     TARGET_BIG_ENDIAN ? 0 : 4);
+	  rtx destLow  = simplify_gen_subreg (SImode, dest, DFmode,
+					     TARGET_BIG_ENDIAN ? 4 : 0);
 
 	  /* Produce the two LR insns to get the high and low parts.  */
 	  emit_insn (gen_rtx_SET (destHigh,
@@ -8946,8 +8947,10 @@ arc_process_double_reg_moves (rtx *operands)
     {
       /* When we have 'mov r, D' or 'mov D, D' and we have access to the
 	 LR insn get the target register pair.  */
-      rtx srcHigh = simplify_gen_subreg(SImode, src, DFmode, 4);
-      rtx srcLow  = simplify_gen_subreg(SImode, src, DFmode, 0);
+      rtx srcHigh = simplify_gen_subreg (SImode, src, DFmode,
+					TARGET_BIG_ENDIAN ? 0 : 4);
+      rtx srcLow  = simplify_gen_subreg (SImode, src, DFmode,
+					TARGET_BIG_ENDIAN ? 4 : 0);
 
       emit_insn (gen_rtx_UNSPEC_VOLATILE (Pmode,
 					  gen_rtvec (3, dest, srcHigh, srcLow),

gcc/config/arc/arc.md

@@ -5752,9 +5752,9 @@
    {
     if (GET_CODE (operands[2]) == CONST_DOUBLE)
      {
-        rtx high, low, tmp;
-        split_double (operands[2], &low, &high);
-        tmp = force_reg (SImode, high);
+        rtx first, second, tmp;
+        split_double (operands[2], &first, &second);
+        tmp = force_reg (SImode, TARGET_BIG_ENDIAN ? first : second);
         emit_insn (gen_adddf3_insn (operands[0], operands[1],
                                     operands[2], tmp, const0_rtx));
      }
@@ -5789,10 +5789,10 @@
      if ((GET_CODE (operands[1]) == CONST_DOUBLE)
           || GET_CODE (operands[2]) == CONST_DOUBLE)
       {
-        rtx high, low, tmp;
+        rtx first, second, tmp;
         int const_index = ((GET_CODE (operands[1]) == CONST_DOUBLE) ? 1 : 2);
-        split_double (operands[const_index], &low, &high);
-        tmp = force_reg (SImode, high);
+        split_double (operands[const_index], &first, &second);
+        tmp = force_reg (SImode, TARGET_BIG_ENDIAN ? first : second);
         emit_insn (gen_subdf3_insn (operands[0], operands[1],
                                     operands[2], tmp, const0_rtx));
       }
@@ -5824,9 +5824,9 @@
     {
      if (GET_CODE (operands[2]) == CONST_DOUBLE)
       {
-        rtx high, low, tmp;
-        split_double (operands[2], &low, &high);
-        tmp = force_reg (SImode, high);
+        rtx first, second, tmp;
+        split_double (operands[2], &first, &second);
+        tmp = force_reg (SImode, TARGET_BIG_ENDIAN ? first : second);
         emit_insn (gen_muldf3_insn (operands[0], operands[1],
                                     operands[2], tmp, const0_rtx));
       }