>>...does Ivy Bridge (i7

>>...does Ivy Bridge (i7 3630qm) share L1 data cache between logical processors?..

I don't think so and please take at ark.intel.com for technical details. When your CPU model is displayed a datasheet with additional technical information has to be in a right part of the webpage.

For example, I have:

Intel Core i7-3840QM ( Ivy Bridge / 4 cores / 8 logical CPUs / ark.intel.com/compare/70846 )

and these are data for all cache lines:

Size of L3 Cache = 8MB ( shared between all cores for data & instructions )
Size of L2 Cache = 1MB ( 256KB per core / shared for data & instructions )
Size of L1 Cache = 256KB ( 32KB per core for data & 32KB per core for instructions )