--- Comment #14 from Dominik Vogt <vogt at linux dot> ---
Isn't this more or less the same problem as the Avr issue?

On Avr, the register allocator would allow r31:HI if the expression is a
paradoxical subreg of memory.  This results in an invalid register pair,

On Arm, the register allocator allows r0:SI for (subreg:DI (reg:SI)).  Again we
get an invalid register pair, r-1/r0.  (Note that the cause of the crash is a
"-1" in "regno"; comment 8.)

=> Bug in the register allocator?

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