Correct bug0077 : [DS]GESVD Minimum Worksize comments need clarification

Depending on the PATH, the minimum workspace is not the same.

Author: julielangou

SRC/dgesvd.f

@@ -115,7 +115,10 @@ SUBROUTINE DGESVD( JOBU, JOBVT, M, N, A, LDA, S, U, LDU, VT, LDVT,
 *
 *  LWORK   (input) INTEGER
 *          The dimension of the array WORK.
-*          LWORK >= MAX(1,3*MIN(M,N)+MAX(M,N),5*MIN(M,N)).
+*          LWORK >= MAX(1,5*MIN(M,N)) for the paths (see comments inside code):
+*             - PATH 1  (M much larger than N, JOBU='N') 
+*             - PATH 1t (N much larger than M, JOBVT='N')
+*          LWORK >= MAX(1,3*MIN(M,N)+MAX(M,N),5*MIN(M,N)) for the other paths
 *          For good performance, LWORK should generally be larger.
 *
 *          If LWORK = -1, then a workspace query is assumed; the routine

SRC/sgesvd.f

@@ -115,7 +115,10 @@ SUBROUTINE SGESVD( JOBU, JOBVT, M, N, A, LDA, S, U, LDU, VT, LDVT,
 *
 *  LWORK   (input) INTEGER
 *          The dimension of the array WORK.
-*          LWORK >= MAX(1,3*MIN(M,N)+MAX(M,N),5*MIN(M,N)).
+*          LWORK >= MAX(1,5*MIN(M,N)) for the paths (see comments inside code):
+*             - PATH 1  (M much larger than N, JOBU='N') 
+*             - PATH 1t (N much larger than M, JOBVT='N')
+*          LWORK >= MAX(1,3*MIN(M,N)+MAX(M,N),5*MIN(M,N)) for the other paths
 *          For good performance, LWORK should generally be larger.
 *
 *          If LWORK = -1, then a workspace query is assumed; the routine