[LLVMdev] Adding masked vector load and store intrinsics

[Demikhovsky, Elena]

>> So %passthrough can *only* be undef or zeroinitializer?
> No, it can be any value including undef and zeroinitializer.
>
> We considered, while designing, zero and merge semantics and decided 
> that merge semantics is better because it covers zero semantics if you 
> use zeroinitializer in the %paththru.

> But passthrough has to have some value, right, to know what to merge?
[Demikhovsky, Elena] Not necessarily. It may be "undef" on IR level. When we don't care about value in masked-off lanes.
> It must appear as an operand, correct? 
[Demikhovsky, Elena] Yes.
> I think this is good, I just want to clarify.  :)

                             -David
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