rs6000: Handle unordered for xscmpexp[dq]p without NaNs (PR92449)

	* config/rs6000/vsx.md (xscmpexpdp_<code> for CMP_TEST): Handle
	UNORDERED if !HONOR_NANS (DFmode).
	(xscmpexpqp_<code>_<mode> for CMP_TEST and IEEE128): Handle UNORDERED
	if !HONOR_NANS (<MODE>mode).

From-SVN: r278103

gcc/ChangeLog

+2019-11-12  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/vsx.md (xscmpexpdp_<code> for CMP_TEST): Handle
+	UNORDERED if !HONOR_NANS (DFmode).
+	(xscmpexpqp_<code>_<mode> for CMP_TEST and IEEE128): Handle UNORDERED
+	if !HONOR_NANS (<MODE>mode).
+
 2019-11-12  Jan Hubicka  <hubicka@ucw.cz>
 
 	* ipa-cp.c (ignore_edge_p): Also look for optimize flag.

gcc/config/rs6000/vsx.md

@@ -4526,6 +4526,12 @@
 		     (const_int 0)))]
   "TARGET_P9_VECTOR"
 {
+  if (<CODE> == UNORDERED && !HONOR_NANS (DFmode))
+    {
+      emit_move_insn (operands[0], const0_rtx);
+      DONE;
+    }
+
   operands[3] = gen_reg_rtx (CCFPmode);
 })
 
@@ -4554,6 +4560,12 @@
 		     (const_int 0)))]
   "TARGET_P9_VECTOR"
 {
+  if (<CODE> == UNORDERED && !HONOR_NANS (<MODE>mode))
+    {
+      emit_move_insn (operands[0], const0_rtx);
+      DONE;
+    }
+
   operands[3] = gen_reg_rtx (CCFPmode);
 })