sparc.md (TFmode splits): Handle destination registers being referenced in the address correctly.

	* config/sparc/sparc.md (TFmode splits): Handle destination
	registers being referenced in the address correctly.

From-SVN: r21901

gcc/ChangeLog

+Fri Aug 21 23:07:46 1998  David S. Miller  <davem@pierdol.cobaltmicro.com>
+
+	* config/sparc/sparc.md (TFmode splits): Handle destination
+	registers being referenced in the address correctly.
+
 Fri Aug 21 19:31:31 1998  Alexandre Petit-Bianco <apbianco@cygnus.com>
 
 	* tree.def (LABELED_BLOCK_EXPR, EXIT_BLOCK_EXPR): New tree nodes.

gcc/config/sparc/sparc.md

@@ -3333,12 +3333,26 @@
   rtx word1 = change_address (operands[1], DFmode,
 			      plus_constant_for_output (XEXP (word0, 0), 8));
   rtx dest1, dest2;
+  int self_reference = reg_mentioned_p (operands[0],
+                                        XEXP (XEXP (word1, 0), 0));
 
   /* Ugly, but gen_highpart will crap out here for 32-bit targets.  */
   dest1 = gen_rtx_SUBREG (DFmode, operands[0], WORDS_BIG_ENDIAN == 0);
   dest2 = gen_rtx_SUBREG (DFmode, operands[0], WORDS_BIG_ENDIAN != 0);
-  emit_insn (gen_movdf (dest1, word0));
-  emit_insn (gen_movdf (dest2, word1));
+
+  /* Now output, ordering such that we don't clobber any registers
+     mentioned in the address.  */
+  if (self_reference != 0
+      && WORDS_BIG_ENDIAN)
+    {
+      emit_insn (gen_movdf (dest2, word1));
+      emit_insn (gen_movdf (dest1, word0));
+    }
+  else
+   {
+      emit_insn (gen_movdf (dest1, word0));
+      emit_insn (gen_movdf (dest2, word1));
+   }
   DONE;
 }")