[Bug rtl-optimization/48496] [4.7/4.8 Regression] 'asm' operand requires impossible reload

[uweigand at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48496

--- Comment #21 from Ulrich Weigand <uweigand at gcc dot gnu.org> 2012-04-10 12:16:36 UTC ---
(In reply to comment #19)

> and the matching alternative would be (f, Q) with
> 
> ;; Note that while this accepts mem, it only accepts non-volatile mem,
> ;; and so cannot be "fixed" by adjusting the address.  Thus it cannot
> ;; and does not use define_memory_constraint.
> (define_constraint "Q"
>   "Non-volatile memory for FP_REG loads/stores"
>   (and (match_operand 0 "memory_operand")
>        (match_test "!MEM_VOLATILE_P (op)")))

Ah, I see.  So the fix would probably be to simply add an equivalent "if
reload_in_progress, accept pseudos" (since pseudo stack slots are never
volatile) to this constrains ...