rs6000: Fix UNORDERED without NaNs, for DFP (PR92573)

This is the analogue of r278103, but for DFP.


	PR target/92573
	* config/rs6000/dfp.md (dfptstsfi_<code>_<mode> for DFP_TEST and DDTD):
	Handle UNORDERED if !HONOR_NANS.

From-SVN: r278497

gcc/ChangeLog

+2019-11-20  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/92573
+	* config/rs6000/dfp.md (dfptstsfi_<code>_<mode> for DFP_TEST and DDTD):
+	Handle UNORDERED if !HONOR_NANS.
+
 2019-11-20  Jan Hubicka  <jh@suse.cz>
 
 	* ipa-inline.c (wrapper_heuristics_may_apply): Break out from ...

gcc/config/rs6000/dfp.md

@@ -289,6 +289,12 @@
   ]
   "TARGET_P9_MISC"
 {
+  if (<CODE> == UNORDERED && !HONOR_NANS (<MODE>mode))
+    {
+      emit_move_insn (operands[0], const0_rtx);
+      DONE;
+    }
+
   operands[3] = gen_reg_rtx (CCFPmode);
 })