[LLVMdev] LLVM ERROR: ran out of registers during register allocation

Borja Ferrer borja.ferav at gmail.com
Wed Dec 19 14:21:09 PST 2012

> We did something like this back when the register allocator couldn't split
> live ranges.

Yes, I remember the isWinToJoinCrossClass() function, removed here:
that prevented some coalescing to the cost of leaving many unnecessary
copies around for very constrained regclasses like the one I have.

> The problem is that any heuristic you can come up with only makes the
> problem less likely to happen. It doesn't actually fix it.

Indeed, that heuristic I wrote is a nasty hack and not the way of fixing it
correctly. Now that the regalloc has much more freedom on making changes in
the code I hope it is fixable. If you need any other info apart of the
dumps I've already attached please ask.

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