Reading this back I realise the last part was lacking the rider:

Richard Sandiford <[email protected]> writes:
> Given that the compiler can't exploit its knowledge the asm contents,

...as a substitute for the constraints.

It's OK to use the integrated assembler to get a more accurate idea
of how long the asm is, or how best to schedule it.  But not being
able to parse it for those purposes seems like warning rather than
error territory.

Thanks,
Richard

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