インテル® Fortran コンパイラー XE 13.1 ユーザー・リファレンス・ガイド

IEEE_SET_ROUNDING_MODE

Intrinsic Module Subroutine (Generic): Sets the IEEE rounding mode.

モジュール

USE, INTRINSIC :: IEEE_ARITHMETIC

CALL IEEE_SET_ROUNDING_MODE (round_value)

round_value

(Output) Must be scalar and of type TYPE (IEEE_ROUND_TYPE). It specifies one of the following IEEE floating-point rounding values:

IEEE_DOWN, IEEE_NEAREST, IEEE_TO_ZERO, IEEE_UP, or IEEE_OTHER.

Consider the following:

USE, INTRINSIC :: IEEE_ARITHMETIC 
TYPE (IEEE_ROUND_TYPE) ROUND
...
CALL IEEE_GET_ROUNDING_MODE (ROUND) ! Stores the rounding mode
CALL IEEE_SET_ROUNDING_MODE (IEEE_UP) ! Resets the rounding mode
...
CALL IEEE_SET_ROUNDING_MODE (VALUE) ! Restores the previous rounding mode

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