This patch (second of two patches) lowers the generic PowerPC vector entries to PowerPC subtarget-specific entries.
For instance, the PowerPC generic entry “cbrtd2_massv” is lowered to “cbrtd2_P9” or Power9 subtarget.
The first patch enables the vectorizer to recognize the IBM MASS vector library routines. This patch specifically adds support for recognizing the “-vector-library=MASSV” option, and defines mappings from IEEE standard scalar math functions to generic PowerPC MASS vector counterparts.
For instance, the generic PowerPC MASS vector entry for double-precision “cbrt” function is “__cbrtd2_massv”
The overall support for MASS vector library is presented as such in two patches for ease of review.