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...uing, >> the overhead is only ~12B / line table entry, or ~80MB. This saves >> 520MB. >> >> This is somewhat perpendicular to redesigning the metadata format, >> but IMO it's worth doing as soon as it's possible. >> >> 4. Create `GenericDebugMDNode`, a transitional subclass of `MDUser` >> through an intermediate class `DebugMDNode` with an >> allocation-time-optional `CallbackVH` available for referencing >> non-metadata. Change `DIDescriptor` to wrap a `DebugMDNode` instead >> of an `MDNode`. >> &gt...

...e integrate a side-table of `MDLineTable`s into its uniquing, the overhead is only ~12B / line table entry, or ~80MB. This saves 520MB. This is somewhat perpendicular to redesigning the metadata format, but IMO it's worth doing as soon as it's possible. 4. Create `GenericDebugMDNode`, a transitional subclass of `MDUser` through an intermediate class `DebugMDNode` with an allocation-time-optional `CallbackVH` available for referencing non-metadata. Change `DIDescriptor` to wrap a `DebugMDNode` instead of an `MDNode`. This saves another ~960MB, for a runnin...

...only ~12B / line table entry, or ~80MB. This saves > >> 520MB. > >> > >> This is somewhat perpendicular to redesigning the metadata format, > >> but IMO it's worth doing as soon as it's possible. > >> > >> 4. Create `GenericDebugMDNode`, a transitional subclass of `MDUser` > >> through an intermediate class `DebugMDNode` with an > >> allocation-time-optional `CallbackVH` available for referencing > >> non-metadata. Change `DIDescriptor` to wrap a `DebugMDNode` instead > >> of a...

...neTable`s into its uniquing, > the overhead is only ~12B / line table entry, or ~80MB. This saves > 520MB. > > This is somewhat perpendicular to redesigning the metadata format, > but IMO it's worth doing as soon as it's possible. > > 4. Create `GenericDebugMDNode`, a transitional subclass of `MDUser` > through an intermediate class `DebugMDNode` with an > allocation-time-optional `CallbackVH` available for referencing > non-metadata. Change `DIDescriptor` to wrap a `DebugMDNode` instead > of an `MDNode`. > > This saves...

...ith the problem space in order to appreciate its import: >> By leveraging the use-list >> infrastructure for metadata operands -- i.e., only using value handles >> for non-metadata operands -- we'll [...] increase >> RAUW speed. [snip] >> 7. (Optional) Refactor `DebugMDNode` sub-classes to minimize RAUW >> traffic during bitcode serialization. Now that metadata types are >> known, we can write debug info out in an order that makes it cheap >> to read back in. >> >> Note that using `MDUser` will make RAUW much cheaper, since...

> On Oct 17, 2014, at 3:54 PM, Sean Silva <chisophugis at gmail.com> wrote: > > this seems like the classic situation where the someone comes to you asking for X, but what they really want is a solution to underlying problem Y, for which the best solution, once you actually analyze Y, is Z. On the contrary, I came into this expecting to work with Eric on parallelizing the backend,