[PATCH] Bitcode: Add bitcode format compatibility test

[David Blaikie]

Not sure about everyone else, but I tried to add regression tests whenever
I've changed the bitcode format, so I'm not sure how much it's necessary to
have a generic test like this. I could imagine coverage isn't great & this
might help - if it's easy to quantify, that might be interesting to know.

On Wed, Jul 22, 2015 at 2:02 PM, Vedant Kumar <vsk at apple.com> wrote:

> Successive versions of LLVM should retain the ability to parse bitcode
> generated by old releases of the compiler. To that end, I've attached a
> patch which contains a bitcode format compatibility test. It's set up as a
> regression test. It achieves good coverage of the 3.7 LangRef (excepting a
> bunch of intrinsics).
>
> The test consists of two files:
>
>     o test/Bitcode/compatibility-3.7.ll
>     o test/Bitcode/compatibility-3.7.ll.bc
>
> We should always be able to disassemble the bitcode file and exactly
> recover
> the original IR.
>
> I've tried to stress as much of the LangRef as possible. I'm still trying
> to find a good way of testing format compatibility for intrinsics.
>
> I'd have preferred to split this patch up into smaller ones, but since it
> contains a binary file I thought it'd be best to get it done in one shot. I
> don't have commit rights, so I'd appreciate someone taking a look at the
> patch and getting it into trunk :).
>
> thanks!
> vedant
>
>
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