* builtins.c (do_mpfr_arg3): New.

	(fold_builtin_1): Handle builtins fma, fmin and fmax.

testsuite:
	* gcc.dg/torture/builtin-math-2.c: Test builtin fma.
	* gcc.dg/torture/builtin-math-3.c (CKSGN_F, CKSGN, CKSGN_L):
	New macros. Use them in exact tests.
	(TESTIT3): New macro.
	Add tests for fmin, fmax and fma.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@118648 138bc75d-0d04-0410-961f-82ee72b054a4