re PR tree-optimization/84687 (error: invalid conversion in gimple call with -O3 and -ffast-math)

	PR tree-optimization/84687
	* omp-simd-clone.c (simd_clone_create): Clear DECL_BUILT_IN_CLASS
	on new_node->decl.
	* match.pd (pow(C,x)*expN(y) -> expN(logN(C)*x+y)): New optimization.

	* gcc.dg/pr84687.c: New test.

From-SVN: r258272

gcc/ChangeLog

+2018-03-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/84687
+	* omp-simd-clone.c (simd_clone_create): Clear DECL_BUILT_IN_CLASS
+	on new_node->decl.
+	* match.pd (pow(C,x)*expN(y) -> expN(logN(C)*x+y)): New optimization.
+
 2018-03-05  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	* config/rs6000/rs6000-builtin.def (rs6000_speculation_barrier):

gcc/match.pd

@@ -4030,6 +4030,16 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
       (exps (mult (logs @0) @1))
       (exp2s (mult (log2s @0) @1)))))))
 
+ /* pow(C,x)*expN(y) -> expN(logN(C)*x+y) if C > 0.  */
+ (for pows (POW)
+      exps (EXP EXP2 EXP10 POW10)
+      logs (LOG LOG2 LOG10 LOG10)
+  (simplify
+   (mult:c (pows:s REAL_CST@0 @1) (exps:s @2))
+   (if (real_compare (GT_EXPR, TREE_REAL_CST_PTR (@0), &dconst0)
+	&& real_isfinite (TREE_REAL_CST_PTR (@0)))
+    (exps (plus (mult (logs @0) @1) @2)))))
+
  (for sqrts (SQRT)
       cbrts (CBRT)
       pows (POW)

gcc/omp-simd-clone.c

@@ -456,6 +456,8 @@ simd_clone_create (struct cgraph_node *old_node)
   if (new_node == NULL)
     return new_node;
 
+  DECL_BUILT_IN_CLASS (new_node->decl) = NOT_BUILT_IN;
+  DECL_FUNCTION_CODE (new_node->decl) = (enum built_in_function) 0;
   TREE_PUBLIC (new_node->decl) = TREE_PUBLIC (old_node->decl);
   DECL_COMDAT (new_node->decl) = DECL_COMDAT (old_node->decl);
   DECL_WEAK (new_node->decl) = DECL_WEAK (old_node->decl);

gcc/testsuite/ChangeLog

+2018-03-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/84687
+	* gcc.dg/pr84687.c: New test.
+
 2018-03-06  Alexandre Oliva <aoliva@redhat.com>
 
 	PR c++/84231

gcc/testsuite/gcc.dg/pr84687.c

+/* PR tree-optimization/84687 */
+/* { dg-do compile } */
+/* { dg-options "-Ofast" } */
+
+int a[64], b;
+double pow (double, double);
+__attribute__((__simd__)) double exp (double);
+
+void
+foo (double x)
+{
+  int i;
+  double c = exp (x);
+  for (i = 0; i < 64; i++)
+    {
+      b = i;
+      a[i] = pow (12.0, b) * pow (c, i);
+    }
+}