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! { dg-do run }
! { dg-add-options ieee }
! { dg-skip-if "PR libfortran/58015" { *-*-solaris2.9* hppa*-*-hpux* } }
! { dg-skip-if "IBM long double 31 bits of precision, test requires 38" { powerpc*-*-linux* } }
!
! PR fortran/35862
!
! Test whether I/O rounding works. Uses internally (libgfortran) strtod
! for the conversion - and sets the CPU rounding mode accordingly.
!
! Only few strtod implementations currently support rounding. Therefore
! we use a heuristic to determine if the rounding support is available.
! The assumption is that if strtod gives *different* results for up/down
! rounding, then it will give *correct* results for nearest/zero/up/down
! rounding too. And that is what is effectively checked.
!
! If it doesn't work on your system, please check whether strtod handles
! rounding correctly and whether your system is supported in
! libgfortran/config/fpu*.c
!
! Please only add ... run { target { ! { triplets } } } if it is unfixable
! on your target - and a note why (strtod has broken rounding support, etc.)
!
program main
use iso_fortran_env
implicit none
! The following uses kinds=10 and 16 if available or
! 8 and 10 - or 8 and 16 - or 4 and 8.
integer, parameter :: xp = real_kinds(ubound(real_kinds,dim=1)-1)
integer, parameter :: qp = real_kinds(ubound(real_kinds,dim=1))
real(4) :: r4p, r4m, ref4u, ref4d
real(8) :: r8p, r8m, ref8u, ref8d
real(xp) :: r10p, r10m, ref10u, ref10d
real(qp) :: r16p, r16m, ref16u, ref16d
character(len=20) :: str, round
logical :: rnd4, rnd8, rnd10, rnd16
! Test for which types glibc's strtod function supports rounding
str = '0.01 0.01 0.01 0.01'
read (str, *, round='up') r4p, r8p, r10p, r16p
read (str, *, round='down') r4m, r8m, r10m, r16m
rnd4 = r4p /= r4m
rnd8 = r8p /= r8m
rnd10 = r10p /= r10m
rnd16 = r16p /= r16m
! write (*, *) rnd4, rnd8, rnd10, rnd16
ref4u = 0.100000001_4
ref8u = 0.10000000000000001_8
if (xp == 4) then
ref10u = 0.100000001_xp
elseif (xp == 8) then
ref10u = 0.10000000000000001_xp
else ! xp == 10
ref10u = 0.1000000000000000000014_xp
end if
if (qp == 8) then
ref16u = 0.10000000000000001_qp
elseif (qp == 10) then
ref16u = 0.1000000000000000000014_qp
else ! qp == 16
ref16u = 0.10000000000000000000000000000000000481_qp
end if
! ref*d = 9.999999...
ref4d = nearest (ref4u, -1.0_4)
ref8d = nearest (ref8u, -1.0_8)
ref10d = nearest (ref10u, -1.0_xp)
ref16d = nearest (ref16u, -1.0_qp)
round = 'up'
call t()
if (rnd4 .and. (r4p /= ref4u .or. r4m /= -ref4d)) call abort()
if (rnd8 .and. (r8p /= ref8u .or. r8m /= -ref8d)) call abort()
if (rnd10 .and. (r10p /= ref10u .or. r10m /= -ref10d)) call abort()
if (rnd16 .and. (r16p /= ref16u .or. r16m /= -ref16d)) call abort()
round = 'down'
call t()
if (rnd4 .and. (r4p /= ref4d .or. r4m /= -ref4u)) call abort()
if (rnd8 .and. (r8p /= ref8d .or. r8m /= -ref8u)) call abort()
if (rnd10 .and. (r10p /= ref10d .or. r10m /= -ref10u)) call abort()
if (rnd16 .and. (r16p /= ref16d .or. r16m /= -ref16u)) call abort()
round = 'zero'
call t()
if (rnd4 .and. (r4p /= ref4d .or. r4m /= -ref4d)) call abort()
if (rnd8 .and. (r8p /= ref8d .or. r8m /= -ref8d)) call abort()
if (rnd10 .and. (r10p /= ref10d .or. r10m /= -ref10d)) call abort()
if (rnd16 .and. (r16p /= ref16d .or. r16m /= -ref16d)) call abort()
round = 'nearest'
call t()
if (rnd4 .and. (r4p /= ref4u .or. r4m /= -ref4u)) call abort()
if (rnd8 .and. (r8p /= ref8u .or. r8m /= -ref8u)) call abort()
if (rnd10 .and. (r10p /= ref10u .or. r10m /= -ref10u)) call abort()
if (rnd16 .and. (r16p /= ref16u .or. r16m /= -ref16u)) call abort()
! Same as nearest (but rounding towards zero if there is a tie
! [does not apply here])
round = 'compatible'
call t()
if (rnd4 .and. (r4p /= ref4u .or. r4m /= -ref4u)) call abort()
if (rnd8 .and. (r8p /= ref8u .or. r8m /= -ref8u)) call abort()
if (rnd10 .and. (r10p /= ref10u .or. r10m /= -ref10u)) call abort()
if (rnd16 .and. (r16p /= ref16u .or. r16m /= -ref16u)) call abort()
contains
subroutine t()
! print *, round
str = "0.1 0.1 0.1 0.1"
read (str, *,round=round) r4p, r8p, r10p, r16p
! write (*, '(*(g0:" "))') r4p, r8p, r10p, r16p
str = "-0.1 -0.1 -0.1 -0.1"
read (str, *,round=round) r4m, r8m, r10m, r16m
! write (*, *) r4m, r8m, r10m, r16m
end subroutine t
end program main
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