*evr, *stevr: use fast CSTEMR path for partial eigenvalue ranges on I…#1295
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…EEE machines The *evr and *stevr routines now call CSTEMR/DSTEMR/SSTEMR with the user-specified RANGE argument on IEEE-754 compliant machines, instead of only using the fast path when the full spectrum is requested (ALLEIG or IL=1, IU=N). Partial eigenvalue ranges with eigenvectors now also benefit from the faster algorithm. Fix a bug where WANTZ=.FALSE. with a partial range on IEEE machines would incorrectly set M=N and skip the DSTEBZ fallback, because INFO remained 0 from initialization when SSTERF was skipped (it can only compute all eigenvalues). The IF(INFO.EQ.0) success check is now moved inside each computational branch so it only triggers when SSTERF or CSTEMR was actually called and succeeded. Closes Reference-LAPACK#1277
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…EEE machines
The *evr and *stevr routines now call CSTEMR/DSTEMR/SSTEMR with the user-specified RANGE argument on IEEE-754 compliant machines, instead of only using the fast path when the full spectrum is requested (ALLEIG or IL=1, IU=N). Partial eigenvalue ranges with eigenvectors now also benefit from the faster algorithm.
Fix a bug where WANTZ=.FALSE. with a partial range on IEEE machines would incorrectly set M=N and skip the DSTEBZ fallback, because INFO remained 0 from initialization when SSTERF was skipped (it can only compute all eigenvalues). The IF(INFO.EQ.0) success check is now moved inside each computational branch so it only triggers when SSTERF or CSTEMR was actually called and succeeded.
Closes #1277