re PR tree-optimization/89437 (incorrect result for sinl (atanl (x)))

Fix PR89437

Fix PR89437. Fix the sinatan-1.c testcase to not run without
a C99 target system.  Use nextafterl for long double initialization.

Fix an issue with sinl (atanl (sqrtl (LDBL_MAX)) returning 0.0
instead of 1.0 by using x < sqrtl (LDBL_MAX) in match.pd.

    gcc/
	PR tree-optimization/89437
	* match.pd: Use lt in sin(atan(x)) and cos(atan(x)) simplifications.

    testsuite/
	PR tree-optimization/89437
	* gcc.dg/sinatan-1.c: Fix testcase.

From-SVN: r269364

gcc/ChangeLog

+2019-03-04  Wilco Dijkstra  <wdijkstr@arm.com>
+
+	PR tree-optimization/89437
+	* match.pd: Use lt in sin(atan(x)) and cos(atan(x)) simplifications.
+
 2019-03-04  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/89572

gcc/match.pd

@@ -4407,7 +4407,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
       tree t_one = build_one_cst (type);
      }
     (if (SCALAR_FLOAT_TYPE_P (type))
-     (cond (le (abs @0) { t_cst; })
+     (cond (lt (abs @0) { t_cst; })
       (rdiv @0 (sqrts (plus (mult @0 @0) { t_one; })))
       (copysigns { t_one; } @0))))))
 
@@ -4427,7 +4427,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
       tree t_zero = build_zero_cst (type);
      }
     (if (SCALAR_FLOAT_TYPE_P (type))
-     (cond (le (abs @0) { t_cst; })
+     (cond (lt (abs @0) { t_cst; })
       (rdiv { t_one; } (sqrts (plus (mult @0 @0) { t_one; })))
       (copysigns { t_zero; } @0))))))
 

gcc/testsuite/ChangeLog

+2019-03-04  Wilco Dijkstra  <wdijkstr@arm.com>
+
+	PR tree-optimization/89437
+	* gcc.dg/sinatan-1.c: Fix testcase.
+
 2019-03-04  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/89572

gcc/testsuite/gcc.dg/sinatan-1.c

-/* { dg-do run } */
+/* { dg-do run { target c99_runtime } } */
 /* { dg-options "-Ofast" } */
 /* { dg-add-options ieee } */
 
@@ -62,7 +62,7 @@ main()
     /* Get first x such that 1 + x*x will overflow */
     float fc = nextafterf (sqrtf (__FLT_MAX__ - 1), __FLT_MAX__);
     double c = nextafter (sqrt (__DBL_MAX__ - 1), __DBL_MAX__);
-    long double lc = nextafter (sqrtl (__LDBL_MAX__ - 1), __LDBL_MAX__);
+    long double lc = nextafterl (sqrtl (__LDBL_MAX__ - 1), __LDBL_MAX__);
 
     /*  Force move from FPU to memory, otherwise comparison may
         fail due to possible more accurate registers (see 387)  */