[Bug inline-asm/68843] ICE with "u" input constraint

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68843

--- Comment #2 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
(In reply to Uroš Bizjak from comment #1)
> There are several non-intuitive rules that one has to follow to avoid ICEs
> with x87 asm operands. Just don't go down that path, there is only pain and
> suffer.

hmm, yes.
and how about checking these rules in ix86_md_asm_adjust
and simply call error ("this constraint won't work, sorry") ?