Elena Demikhovsky 5494698828 Implemented cost model for masked gather and scatter operations ...

The cost is calculated for all X86 targets. When gather/scatter instruction
is not supported we calculate the cost of scalar sequence.

Differential revision: http://reviews.llvm.org/D15677

llvm-svn: 256519

2015-12-28 20:10:59 +00:00

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