c3pi
testall_tol(cacosh, -z, CMPLXL(INFINITY, -c3pi / 4), 1);
testall_tol(cacos, -z, CMPLXL(c3pi / 4, INFINITY), 1);
c3pi = 9.42477796076937971538793014983850839e+00L,
testall2(atan2, INFINITY, -INFINITY, c3pi / 4, FE_INEXACT);
testall2(atan2, -INFINITY, -INFINITY, -c3pi / 4, FE_INEXACT);
testall_tol(acos, -sqrtl(2) / 2, c3pi / 4, 1, FE_INEXACT);
testall2(atan2, 1.0, -1.0, c3pi / 4, FE_INEXACT);
testall2(atan2, -1.0, -1.0, -c3pi / 4, FE_INEXACT);