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As far as I know, optimization levels higher than -O0 work fine with SpillPointers. But at least in a cursory first look I had a while ago, the optimizations made things slower overall. I guess they might lead actually to more "moving pointers in and out of the heap" since the SpillPointers pass is done at the very end. But this should all be investigated more thoroughly.

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Hey! Thanks for the offer and thanks for the correction. I've revisited relevant threads and it seems that it is indeed -O0 because things are slower with higher optimization levels (I must have misremembered).

Relevant links: https://gitlab.com/embeddable-common-lisp/ecl/-/merge_reques... https://github.com/ivmai/bdwgc/issues/650

Most notably an entry in the INSTALL file:

``` the optimization level -O0 is used because higher optimization levels seem to interfere with the binaryen options needed to get the garbage collector to work correctly and tend slow down the program (might be worth experimenting with the optimization options) ```

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