Multiple names for gcc inline assembly constraints?

[Eric Sedlar <esedlar@xxxxxxxxx>]

As per the GCC manual:

 As of GCC version 3.1, one may write `[NAME]' instead of the operand
number for a matching constraint.  For example:

     asm ("cmoveq %1,%2,%[result]"
          : [result] "=r"(result)
          : "r" (test), "r"(new), "[result]"(old));

Is
it possible to define multiple [NAME]s for the same constraint?  This
would be useful for documentation purposes in the code so that a particular
register re-used for multiple purposes inside a single assembly block
could have a different symbolic name for each purpose it is used for.

Thanks,

  Eric