DSYEVR should call DSTEMR for RANGE="V" or "I"

[langou]

DSYEVR only calls DSTEMR when ALL eigenvalues are requested. Otherwise, when a subset is requested, so with option RANGE="V" or "I", DSYEVR calls DSTEBZ/DSTEIN.

Suggestion: DSYEVR could call DSTEMR also when a subset is requested. (So with option RANGE="V" or "I".)

See
JuliaLang/LinearAlgebra.jl#1493

See

lapack/SRC/dsyevr.f

Line 580 in 67c7c8a

IF( ( ALLEIG .OR. ( INDEIG .AND. IL.EQ.1 .AND. IU.EQ.N ) ) .AND.

[martin-frbg]

related to #466 (where dstemr was floated as a possible solution, but a simpler fix was proposed in the end) ?

[langou]

Reopening this issue because #1324 reverts #1275, and #1275 closed this issue.