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Refactor IEEECK to avoid generating IEEE exceptions by using IEEE_ARITHMETIC #1168

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Refactor IEEECK to avoid generating IEEE exceptions by using IEEE_ARITHMETIC #1168

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90 changes: 5 additions & 85 deletions SRC/ieeeck.f
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Original file line number Diff line number Diff line change
Expand Up @@ -77,6 +77,9 @@
*
* =====================================================================
INTEGER FUNCTION IEEECK( ISPEC, ZERO, ONE )
USE, INTRINSIC :: IEEE_ARITHMETIC, ONLY:
& IEEE_SUPPORT_INF,
& IEEE_SUPPORT_NAN
IMPLICIT NONE
*
* -- LAPACK auxiliary routine --
Expand All @@ -90,57 +93,11 @@ INTEGER FUNCTION IEEECK( ISPEC, ZERO, ONE )
*
* =====================================================================
*
* .. Local Scalars ..
REAL NAN1, NAN2, NAN3, NAN4, NAN5, NAN6, NEGINF,
$ NEGZRO, NEWZRO, POSINF
* ..
* .. Executable Statements ..
IEEECK = 1
*
POSINF = ONE / ZERO
IF( POSINF.LE.ONE ) THEN
IEEECK = 0
RETURN
END IF
*
NEGINF = -ONE / ZERO
IF( NEGINF.GE.ZERO ) THEN
IEEECK = 0
RETURN
END IF
*
NEGZRO = ONE / ( NEGINF+ONE )
IF( NEGZRO.NE.ZERO ) THEN
IEEECK = 0
RETURN
END IF
*
NEGINF = ONE / NEGZRO
IF( NEGINF.GE.ZERO ) THEN
IEEECK = 0
RETURN
END IF
*
NEWZRO = NEGZRO + ZERO
IF( NEWZRO.NE.ZERO ) THEN
IEEECK = 0
RETURN
END IF
*
POSINF = ONE / NEWZRO
IF( POSINF.LE.ONE ) THEN
IEEECK = 0
RETURN
END IF
*
NEGINF = NEGINF*POSINF
IF( NEGINF.GE.ZERO ) THEN
IEEECK = 0
RETURN
END IF
*
POSINF = POSINF*POSINF
IF( POSINF.LE.ONE ) THEN
IF ( .NOT.IEEE_SUPPORT_INF(ONE) ) THEN
IEEECK = 0
RETURN
END IF
Expand All @@ -153,44 +110,7 @@ INTEGER FUNCTION IEEECK( ISPEC, ZERO, ONE )
IF( ISPEC.EQ.0 )
$ RETURN
*
NAN1 = POSINF + NEGINF
*
NAN2 = POSINF / NEGINF
*
NAN3 = POSINF / POSINF
*
NAN4 = POSINF*ZERO
*
NAN5 = NEGINF*NEGZRO
*
NAN6 = NAN5*ZERO
*
IF( NAN1.EQ.NAN1 ) THEN
IEEECK = 0
RETURN
END IF
*
IF( NAN2.EQ.NAN2 ) THEN
IEEECK = 0
RETURN
END IF
*
IF( NAN3.EQ.NAN3 ) THEN
IEEECK = 0
RETURN
END IF
*
IF( NAN4.EQ.NAN4 ) THEN
IEEECK = 0
RETURN
END IF
*
IF( NAN5.EQ.NAN5 ) THEN
IEEECK = 0
RETURN
END IF
*
IF( NAN6.EQ.NAN6 ) THEN
IF( .NOT.IEEE_SUPPORT_NAN(ONE) ) THEN
IEEECK = 0
RETURN
END IF
Expand Down