qbe built from commit 04b2967 with the arm64 target selected exhibits an
assertion failure "temporary has mapping" during the register allocation
stage when passed this input:

https://paste.sr.ht/~handlerug/f9e0f7bec5350b814bcf5123470cca6aed73ef02

The assertion is at rega.c:92.

Reproduced on Alpine Linux edge, IR generated by the harec (compiler for
the Hare programming language) commit 8a0b4ff from this code:

https://paste.sr.ht/~handlerug/4b3e28b1a895a45dd808e5540920a410adc56d26

Hi Umar,

Thank you for the report. As of commit 87dc3ea290a4ba75f153c5bb8b9fb87ec548e64f
qbe should compile this example correctly. The bug was triggered because the
example generated IL with a very large number of temporaries live at some block
boundaries. It was a defect of the copy elimination pass that so many temps were
live, and I fixed it (at least for this example) in commit
0db06dad63e02b619671bfb3dd25fc92c0856319.

Thanks for reporting the bug.