DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.
DLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow.
I0 is INTEGER First index.
N0 is INTEGER Last index.
Z is DOUBLE PRECISION array, dimension ( 4*N ) Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument.
PP is INTEGER PP=0 for ping, PP=1 for pong.
DMIN is DOUBLE PRECISION Minimum value of d.
DMIN1 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ).
DMIN2 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN is DOUBLE PRECISION d(N0), the last value of d.
DNM1 is DOUBLE PRECISION d(N0-1).
DNM2 is DOUBLE PRECISION d(N0-2).
Univ. of California Berkeley
Univ. of Colorado Denver
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