[fpc-devel] ASM One register allocated twice at once ? 3.3.1 peephole / # Register r10, r15, r15 allocated

[Martin Frb]

3.3.1 d3ac07ad274b6c6b09ff9b08a9d7007aaf780aa6

I am currently tracking an issue (either my code, or the peephole opt / 
or some opt+peephole).

While going through the asm I found:

     # Register r10,r15,r15 allocated

Why is r15 twice in the list?
Is that supposed to happen? Or is that in itself an issue?