fma
double fma(double, double, double);
#define fma(a,b,c) __TG_FN3(fma, (a), (b), (c))
__strong_alias(fmal, fma)
lua_pushnumber(L, fma(x[0], x[1], x[2]));
TEST(fma(M_PI, M_E, M_SQRT2));