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[4.8.[01]] PowerPC di->ti widening multiplication


For gcc 4.9, I intend to ensure that optabs.c can make automatic use of [us]mul<mode>_highpart. There are plenty of targets that only implement _highpart but not the widening pattern. But that's not something that would be appropriate at this stage in the 4.8 cycle.

Whether this patch is appropriate for 4.8.0 is someone else's call, but it's probably safe to queue it for 4.8.1.


r~



* config/rs6000/rs6000.md (smulditi3): New. (umulditi3): New.

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