re PR middle-end/82319 (ICE in generic_simplify_148, at generic-match.c:6436)

2017-09-29  Yury Gribov  <tetra2005@gmail.com>

	PR middle-end/82319
gcc/
	* match.pd: Fix handling of NaNs in pattern.

gcc/testsuite/
	* c-c++/common/pr57371-4.c: Test NaN comparisons.

From-SVN: r253307

gcc/ChangeLog

+2017-09-29  Yury Gribov  <tetra2005@gmail.com>
+
+	PR middle-end/82319
+	* match.pd: Fix handling of NaNs in pattern.
+
 2017-09-29  Jeff Law  <law@redhat.com>
 
 	* sbitmap.c (bitmap_bit_in_range_p): New function.

gcc/match.pd

@@ -2961,7 +2961,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
 	 else
 	   real_trunc (&icst, fmt, cst);
 
-	 bool cst_int_p = real_identical (&icst, cst);
+	 bool cst_int_p = !real_isnan (cst) && real_identical (&icst, cst);
 
 	 bool overflow_p = false;
 	 wide_int icst_val

gcc/testsuite/ChangeLog

+2017-09-29  Yury Gribov  <tetra2005@gmail.com>
+
+	PR middle-end/82319
+	* c-c++/common/pr57371-4.c: Test NaN comparisons.
+
 2017-09-29  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* g++.dg/other/dump-ada-spec-10.C: New test.

gcc/testsuite/c-c++-common/pr57371-4.c

@@ -69,4 +69,16 @@ void nonfinite(unsigned short x) {
     nonfinite_10 = (float) x != SNAN;
     /* { dg-final { scan-tree-dump "nonfinite_10 = \\(float\\)" "original" } } */
   }
+
+  {
+    volatile int nonfinite_11;
+    nonfinite_11 = (float) x == QNAN;
+    /* { dg-final { scan-tree-dump "nonfinite_11 = 0" "original" } } */
+  }
+
+  {
+    volatile int nonfinite_12;
+    nonfinite_12 = (float) x != QNAN;
+    /* { dg-final { scan-tree-dump "nonfinite_12 = 1" "original" } } */
+  }
 }