PR 61876: Do not convert cast + __builtin_round into __builtin_lround unless…

PR 61876: Do not convert cast + __builtin_round into __builtin_lround unless -fno-math-errno is used.

	PR middle-end/61876
	* convert.c (convert_to_integer): Do not convert BUILT_IN_ROUND and cast
	when flag_errno_math is on.

From-SVN: r212989

gcc/ChangeLog

+2014-07-24  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR middle-end/61876
+	* convert.c (convert_to_integer): Do not convert BUILT_IN_ROUND and cast
+	when flag_errno_math is on.
+
 2014-07-24  Martin Liska  <mliska@suse.cz>
 
 	* cgraph.h (varpool_node):

gcc/convert.c

@@ -456,8 +456,8 @@ convert_to_integer (tree type, tree expr)
 	  break;
 
 	CASE_FLT_FN (BUILT_IN_ROUND):
-	  /* Only convert in ISO C99 mode.  */
-	  if (!targetm.libc_has_function (function_c99_misc))
+	  /* Only convert in ISO C99 mode and with -fno-math-errno.  */
+	  if (!targetm.libc_has_function (function_c99_misc) || flag_errno_math)
 	    break;
 	  if (outprec < TYPE_PRECISION (integer_type_node)
 	      || (outprec == TYPE_PRECISION (integer_type_node)