xgesdd: Handle norm nan value

Closes Reference-LAPACK#469
christoph-conrads · Jan 8, 2021 · 02b8bc6 · 02b8bc6
1 parent cd3ba1f
commit 02b8bc6
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Showing 4 changed files with 24 additions and 8 deletions.
diff --git a/SRC/cgesdd.f b/SRC/cgesdd.f
@@ -281,9 +281,9 @@ SUBROUTINE CGESDD( JOBZ, M, N, A, LDA, S, U, LDU, VT, LDVT,
      $                   CUNGQR, CUNMBR, SBDSDC, SLASCL, XERBLA
 *     ..
 *     .. External Functions ..
-      LOGICAL            LSAME
+      LOGICAL            LSAME, SISNAN
       REAL               SLAMCH, CLANGE
-      EXTERNAL           LSAME, SLAMCH, CLANGE
+      EXTERNAL           LSAME, SLAMCH, CLANGE, SISNAN
 *     ..
 *     .. Intrinsic Functions ..
       INTRINSIC          INT, MAX, MIN, SQRT
@@ -647,6 +647,10 @@ SUBROUTINE CGESDD( JOBZ, M, N, A, LDA, S, U, LDU, VT, LDVT,
 *     Scale A if max element outside range [SMLNUM,BIGNUM]
 *
       ANRM = CLANGE( 'M', M, N, A, LDA, DUM )
+      IF( SISNAN ( ANRM ) ) THEN
+          INFO = -4
+          RETURN
+      END IF
       ISCL = 0
       IF( ANRM.GT.ZERO .AND. ANRM.LT.SMLNUM ) THEN
          ISCL = 1

diff --git a/SRC/dgesdd.f b/SRC/dgesdd.f
@@ -267,9 +267,9 @@ SUBROUTINE DGESDD( JOBZ, M, N, A, LDA, S, U, LDU, VT, LDVT,
      $                   XERBLA
 *     ..
 *     .. External Functions ..
-      LOGICAL            LSAME
+      LOGICAL            LSAME, DISNAN
       DOUBLE PRECISION   DLAMCH, DLANGE
-      EXTERNAL           DLAMCH, DLANGE, LSAME
+      EXTERNAL           DLAMCH, DLANGE, LSAME, DISNAN
 *     ..
 *     .. Intrinsic Functions ..
       INTRINSIC          INT, MAX, MIN, SQRT
@@ -599,6 +599,10 @@ SUBROUTINE DGESDD( JOBZ, M, N, A, LDA, S, U, LDU, VT, LDVT,
 *     Scale A if max element outside range [SMLNUM,BIGNUM]
 *
       ANRM = DLANGE( 'M', M, N, A, LDA, DUM )
+      IF( DISNAN( ANRM ) ) THEN
+          INFO = -4
+          RETURN
+      END IF
       ISCL = 0
       IF( ANRM.GT.ZERO .AND. ANRM.LT.SMLNUM ) THEN
          ISCL = 1

diff --git a/SRC/sgesdd.f b/SRC/sgesdd.f
@@ -267,9 +267,9 @@ SUBROUTINE SGESDD( JOBZ, M, N, A, LDA, S, U, LDU, VT, LDVT,
      $                   XERBLA
 *     ..
 *     .. External Functions ..
-      LOGICAL            LSAME
+      LOGICAL            LSAME, SISNAN
       REAL               SLAMCH, SLANGE
-      EXTERNAL           SLAMCH, SLANGE, LSAME
+      EXTERNAL           SLAMCH, SLANGE, LSAME, SISNAN
 *     ..
 *     .. Intrinsic Functions ..
       INTRINSIC          INT, MAX, MIN, SQRT
@@ -599,6 +599,10 @@ SUBROUTINE SGESDD( JOBZ, M, N, A, LDA, S, U, LDU, VT, LDVT,
 *     Scale A if max element outside range [SMLNUM,BIGNUM]
 *
       ANRM = SLANGE( 'M', M, N, A, LDA, DUM )
+      IF( SISNAN( ANRM ) ) THEN
+          INFO = -4
+          RETURN
+      END IF
       ISCL = 0
       IF( ANRM.GT.ZERO .AND. ANRM.LT.SMLNUM ) THEN
          ISCL = 1

diff --git a/SRC/zgesdd.f b/SRC/zgesdd.f
@@ -281,9 +281,9 @@ SUBROUTINE ZGESDD( JOBZ, M, N, A, LDA, S, U, LDU, VT, LDVT,
      $                   ZLASET, ZUNGBR, ZUNGLQ, ZUNGQR, ZUNMBR
 *     ..
 *     .. External Functions ..
-      LOGICAL            LSAME
+      LOGICAL            LSAME, DISNAN
       DOUBLE PRECISION   DLAMCH, ZLANGE
-      EXTERNAL           LSAME, DLAMCH, ZLANGE
+      EXTERNAL           LSAME, DLAMCH, ZLANGE, DISNAN
 *     ..
 *     .. Intrinsic Functions ..
       INTRINSIC          INT, MAX, MIN, SQRT
@@ -647,6 +647,10 @@ SUBROUTINE ZGESDD( JOBZ, M, N, A, LDA, S, U, LDU, VT, LDVT,
 *     Scale A if max element outside range [SMLNUM,BIGNUM]
 *
       ANRM = ZLANGE( 'M', M, N, A, LDA, DUM )
+      IF( DISNAN( ANRM ) ) THEN
+          INFO = -4
+          RETURN
+      END IF
       ISCL = 0
       IF( ANRM.GT.ZERO .AND. ANRM.LT.SMLNUM ) THEN
          ISCL = 1