--- rpl/lapack/lapack/zhegs2.f	2012/12/14 12:30:29	1.12
+++ rpl/lapack/lapack/zhegs2.f	2023/08/07 08:39:23	1.20
@@ -2,24 +2,24 @@
 *
 *  =========== DOCUMENTATION ===========
 *
-* Online html documentation available at 
-*            http://www.netlib.org/lapack/explore-html/ 
+* Online html documentation available at
+*            http://www.netlib.org/lapack/explore-html/
 *
 *> \htmlonly
-*> Download ZHEGS2 + dependencies 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zhegs2.f"> 
-*> [TGZ]</a> 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zhegs2.f"> 
-*> [ZIP]</a> 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zhegs2.f"> 
+*> Download ZHEGS2 + dependencies
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zhegs2.f">
+*> [TGZ]</a>
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zhegs2.f">
+*> [ZIP]</a>
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zhegs2.f">
 *> [TXT]</a>
-*> \endhtmlonly 
+*> \endhtmlonly
 *
 *  Definition:
 *  ===========
 *
 *       SUBROUTINE ZHEGS2( ITYPE, UPLO, N, A, LDA, B, LDB, INFO )
-* 
+*
 *       .. Scalar Arguments ..
 *       CHARACTER          UPLO
 *       INTEGER            INFO, ITYPE, LDA, LDB, N
@@ -27,7 +27,7 @@
 *       .. Array Arguments ..
 *       COMPLEX*16         A( LDA, * ), B( LDB, * )
 *       ..
-*  
+*
 *
 *> \par Purpose:
 *  =============
@@ -97,6 +97,7 @@
 *>          B is COMPLEX*16 array, dimension (LDB,N)
 *>          The triangular factor from the Cholesky factorization of B,
 *>          as returned by ZPOTRF.
+*>          B is modified by the routine but restored on exit.
 *> \endverbatim
 *>
 *> \param[in] LDB
@@ -115,22 +116,19 @@
 *  Authors:
 *  ========
 *
-*> \author Univ. of Tennessee 
-*> \author Univ. of California Berkeley 
-*> \author Univ. of Colorado Denver 
-*> \author NAG Ltd. 
-*
-*> \date September 2012
+*> \author Univ. of Tennessee
+*> \author Univ. of California Berkeley
+*> \author Univ. of Colorado Denver
+*> \author NAG Ltd.
 *
 *> \ingroup complex16HEcomputational
 *
 *  =====================================================================
       SUBROUTINE ZHEGS2( ITYPE, UPLO, N, A, LDA, B, LDB, INFO )
 *
-*  -- LAPACK computational routine (version 3.4.2) --
+*  -- LAPACK computational routine --
 *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
 *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
-*     September 2012
 *
 *     .. Scalar Arguments ..
       CHARACTER          UPLO
@@ -196,8 +194,8 @@
 *
 *              Update the upper triangle of A(k:n,k:n)
 *
-               AKK = A( K, K )
-               BKK = B( K, K )
+               AKK = DBLE( A( K, K ) )
+               BKK = DBLE( B( K, K ) )
                AKK = AKK / BKK**2
                A( K, K ) = AKK
                IF( K.LT.N ) THEN
@@ -226,8 +224,8 @@
 *
 *              Update the lower triangle of A(k:n,k:n)
 *
-               AKK = A( K, K )
-               BKK = B( K, K )
+               AKK = DBLE( A( K, K ) )
+               BKK = DBLE( B( K, K ) )
                AKK = AKK / BKK**2
                A( K, K ) = AKK
                IF( K.LT.N ) THEN
@@ -251,8 +249,8 @@
 *
 *              Update the upper triangle of A(1:k,1:k)
 *
-               AKK = A( K, K )
-               BKK = B( K, K )
+               AKK = DBLE( A( K, K ) )
+               BKK = DBLE( B( K, K ) )
                CALL ZTRMV( UPLO, 'No transpose', 'Non-unit', K-1, B,
      $                     LDB, A( 1, K ), 1 )
                CT = HALF*AKK
@@ -271,8 +269,8 @@
 *
 *              Update the lower triangle of A(1:k,1:k)
 *
-               AKK = A( K, K )
-               BKK = B( K, K )
+               AKK = DBLE( A( K, K ) )
+               BKK = DBLE( B( K, K ) )
                CALL ZLACGV( K-1, A( K, 1 ), LDA )
                CALL ZTRMV( UPLO, 'Conjugate transpose', 'Non-unit', K-1,
      $                     B, LDB, A( K, 1 ), LDA )