re PR c++/49813 ([C++0x] sinh vs asinh vs constexpr)

2011-07-28  Paolo Carlini  <paolo.carlini@oracle.com>

        PR c++/49813
        * semantics.c (potential_constant_expression_1):  Handle FMA_EXPR.

	Checking this in for Paolo.

From-SVN: r176899

gcc/cp/ChangeLog

+2011-07-28  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/49813
+	* semantics.c (potential_constant_expression_1):  Handle FMA_EXPR.
+
 2011-07-27  Jeffrey Yasskin  <jyasskin@google.com>
 
 	* pt.c (build_template_decl): Copy the function_decl's

gcc/cp/semantics.c

@@ -8057,6 +8057,13 @@ potential_constant_expression_1 (tree t, bool want_rval, tsubst_flags_t flags)
 	  return false;
       return true;
 
+    case FMA_EXPR:
+     for (i = 0; i < 3; ++i)
+      if (!potential_constant_expression_1 (TREE_OPERAND (t, i),
+					    true, flags))
+	return false;
+     return true;
+
     case COND_EXPR:
     case VEC_COND_EXPR:
       /* If the condition is a known constant, we know which of the legs we