S/390: Add widening vector mult lo/hi patterns
Add support for widening vector multiply lo/hi patterns. These do not directly match on IBM Z instructions but can be emulated with even/odd + vector merge. gcc/ChangeLog: 2017-09-26 Andreas Krebbel <krebbel@linux.vnet.ibm.com> * config/s390/vector.md ("vec_widen_umult_lo_<mode>") ("vec_widen_umult_hi_<mode>", "vec_widen_smult_lo_<mode>") ("vec_widen_smult_hi_<mode>"): New expander definitions. From-SVN: r253192
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