| ! { dg-do run } |
| ! { dg-require-effective-target fortran_largest_fp_has_sqrt } |
| ! |
| ! This test checks whether the largest possible |
| ! floating-point number works. |
| ! |
| ! This is a run-time check. Depending on the architecture, |
| ! this tests REAL(8), REAL(10) or REAL(16) and REAL(16) |
| ! might be a hardware or libquadmath 128bit number. |
| ! |
| program test_qp |
| use iso_fortran_env, only: real_kinds |
| implicit none |
| integer, parameter :: QP = real_kinds(ubound(real_kinds,dim=1)) |
| real(qp) :: fp1, fp2, fp3, fp4 |
| character(len=80) :: str1, str2, str3, str4 |
| fp1 = 1 |
| fp2 = sqrt (2.0_qp) |
| write (str1,*) fp1 |
| write (str2,'(g0)') fp1 |
| write (str3,*) fp2 |
| write (str4,'(g0)') fp2 |
| |
| ! print '(3a)', '>',trim(str1),'<' |
| ! print '(3a)', '>',trim(str2),'<' |
| ! print '(3a)', '>',trim(str3),'<' |
| ! print '(3a)', '>',trim(str4),'<' |
| |
| read (str1, *) fp3 |
| if (fp1 /= fp3) call abort() |
| read (str2, *) fp3 |
| if (fp1 /= fp3) call abort() |
| read (str3, *) fp4 |
| if (fp2 /= fp4) call abort() |
| read (str4, *) fp4 |
| if (fp2 /= fp4) call abort() |
| |
| select case (qp) |
| case (8) |
| if (str1 /= " 1.0000000000000000") call abort() |
| if (str2 /= "1.0000000000000000") call abort() |
| if (str3 /= " 1.4142135623730951") call abort() |
| if (str4 /= "1.4142135623730951") call abort() |
| |
| case (10) |
| if (str1 /= " 1.00000000000000000000") call abort() |
| if (str2 /= "1.00000000000000000000") call abort() |
| if (str3 /= " 1.41421356237309504876") call abort() |
| if (str4 /= "1.41421356237309504876") call abort() |
| |
| case (16) |
| if (str1 /= " 1.00000000000000000000000000000000000") call abort() |
| if (str2 /= "1.00000000000000000000000000000000000") call abort() |
| |
| if (digits(1.0_qp) == 113) then |
| ! IEEE 754 binary 128 format |
| ! e.g. libquadmath/__float128 on i686/x86_64/ia64 |
| if (str3 /= " 1.41421356237309504880168872420969798") call abort() |
| if (str4 /= "1.41421356237309504880168872420969798") call abort() |
| else if (digits(1.0_qp) == 106) then |
| ! IBM binary 128 format |
| if (str3(1:37) /= " 1.41421356237309504880168872420969") call abort() |
| if (str4(1:34) /= "1.41421356237309504880168872420969") call abort() |
| end if |
| |
| ! Do a libm run-time test |
| block |
| real(qp), volatile :: fp2a |
| fp2a = 2.0_qp |
| fp2a = sqrt (fp2a) |
| if (abs (fp2a - fp2) > sqrt(2.0_qp)-nearest(sqrt(2.0_qp),-1.0_qp)) call abort() |
| end block |
| |
| case default |
| call abort() |
| end select |
| |
| end program test_qp |
