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...overall memory drop >> of 4%. > > Forgot to post numbers for this. Peak memory was at 920 MB before > the five patches, and 884 MB after. (These exact numbers won't quite > reproduce in ToT since I still haven't finished cleaning up and > committing the MCSymbol and emitLabelDiff() work I hacked on top of, > but the 36 MB drop should hold.) I've cleaned all this up and committed the most obvious parts, as well as a few unrelated memory improvements. I'm attaching my (almost?) ready-to-go patches, which have the following effects on peak memory: - 0000: 845 M...

...d.patch, which we're using to make Intrustruments more >> accurate (instead of effectively leaking things onto BumpPtrAllocators, >> really leak them with malloc()). (I've collected this data on top of a >> few not-yet-committed patches to cheapen `MCSymbol` and >> `EmitLabelDifference()` that chop around 8% of memory off the top, but >> otherwise these numbers should be reproducible in ToT.) >> >> The `DIE` class is huge. Directly, it accounts for about 15% of backend >> memory: >> >> Bytes Used Count Symbol Name >> 77.87...