Unfortunately that often doesn't work well for optimisation passes, as many passes end up relating to each other. However, you can still keep removing sets of

Unfortunately that often doesn't work well for optimisation passes, as many passes end up relating to each other. However, you can still keep removing sets of optimisations and hope the bug remains, and do a final pass where you remove each optimisation one at a time. Another problem is that in the past I found compiler bugs from running unusual sets of optimisation passes.