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! { dg-do run }
! { dg-additional-options "-mfp-rounding-mode=d" { target alpha*-*-* } }
use, intrinsic :: ieee_features
use, intrinsic :: ieee_arithmetic
implicit none
! k1 and k2 will be large real kinds, if supported, and single/double
! otherwise
integer, parameter :: k1 = &
max(ieee_selected_real_kind(precision(0.d0) + 1), kind(0.))
integer, parameter :: k2 = &
max(ieee_selected_real_kind(precision(0._k1) + 1), kind(0.d0))
interface check_equal
procedure check_equal1, check_equal2
end interface
interface check_not_equal
procedure check_not_equal1, check_not_equal2
end interface
interface divide
procedure divide1, divide2
end interface
real(kind=k1) :: x1, x2, x3
real(kind=k2) :: y1, y2, y3
type(ieee_round_type) :: mode
if (ieee_support_rounding(ieee_up, x1) .and. &
ieee_support_rounding(ieee_down, x1) .and. &
ieee_support_rounding(ieee_nearest, x1) .and. &
ieee_support_rounding(ieee_to_zero, x1)) then
x1 = 1
x2 = 3
x1 = divide(x1, x2, ieee_up)
x3 = 1
x2 = 3
x3 = divide(x3, x2, ieee_down)
call check_not_equal(x1, x3)
call check_equal(x3, nearest(x1, -1._k1))
call check_equal(x1, nearest(x3, 1._k1))
call check_equal(1._k1/3._k1, divide(1._k1, 3._k1, ieee_nearest))
call check_equal(-1._k1/3._k1, divide(-1._k1, 3._k1, ieee_nearest))
call check_equal(divide(3._k1, 7._k1, ieee_to_zero), &
divide(3._k1, 7._k1, ieee_down))
call check_equal(divide(-3._k1, 7._k1, ieee_to_zero), &
divide(-3._k1, 7._k1, ieee_up))
end if
if (ieee_support_rounding(ieee_up, y1) .and. &
ieee_support_rounding(ieee_down, y1) .and. &
ieee_support_rounding(ieee_nearest, y1) .and. &
ieee_support_rounding(ieee_to_zero, y1)) then
y1 = 1
y2 = 3
y1 = divide(y1, y2, ieee_up)
y3 = 1
y2 = 3
y3 = divide(y3, y2, ieee_down)
call check_not_equal(y1, y3)
call check_equal(y3, nearest(y1, -1._k2))
call check_equal(y1, nearest(y3, 1._k2))
call check_equal(1._k2/3._k2, divide(1._k2, 3._k2, ieee_nearest))
call check_equal(-1._k2/3._k2, divide(-1._k2, 3._k2, ieee_nearest))
call check_equal(divide(3._k2, 7._k2, ieee_to_zero), &
divide(3._k2, 7._k2, ieee_down))
call check_equal(divide(-3._k2, 7._k2, ieee_to_zero), &
divide(-3._k2, 7._k2, ieee_up))
end if
contains
real(kind=k1) function divide1 (x, y, rounding) result(res)
use, intrinsic :: ieee_arithmetic
real(kind=k1), intent(in) :: x, y
type(ieee_round_type), intent(in) :: rounding
type(ieee_round_type) :: old
call ieee_get_rounding_mode (old)
call ieee_set_rounding_mode (rounding)
res = x / y
call ieee_set_rounding_mode (old)
end function
real(kind=k2) function divide2 (x, y, rounding) result(res)
use, intrinsic :: ieee_arithmetic
real(kind=k2), intent(in) :: x, y
type(ieee_round_type), intent(in) :: rounding
type(ieee_round_type) :: old
call ieee_get_rounding_mode (old)
call ieee_set_rounding_mode (rounding)
res = x / y
call ieee_set_rounding_mode (old)
end function
subroutine check_equal1 (x, y)
real(kind=k1), intent(in) :: x, y
if (x /= y) then
print *, x, y
STOP 1
end if
end subroutine
subroutine check_equal2 (x, y)
real(kind=k2), intent(in) :: x, y
if (x /= y) then
print *, x, y
STOP 2
end if
end subroutine
subroutine check_not_equal1 (x, y)
real(kind=k1), intent(in) :: x, y
if (x == y) then
print *, x, y
STOP 3
end if
end subroutine
subroutine check_not_equal2 (x, y)
real(kind=k2), intent(in) :: x, y
if (x == y) then
print *, x, y
STOP 4
end if
end subroutine
end
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