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

[gccbugzilla at limegreensocks dot com]

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

David <gccbugzilla at limegreensocks dot com> changed:

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--- Comment #3 from David <gccbugzilla at limegreensocks dot com> ---
(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.

Someone else was just complaining about the doc example for using floating
point (https://gcc.gnu.org/ml/gcc-help/2015-10/msg00088.html).  If there is no
practical way to make this work, perhaps the docs should reflect this? 
Alternately, perhaps a couple examples that show the right way?