When compiling compile/pr17906.c, compute_frame_pointer_to_fb_displacement passes the argument pointer to eliminate_regs. This eliminates it to the frame pointer, which later causes and ICE because frame_pointer_needed is not set.
The problem is that ELIMINABLE_REGS in avr.h does not specify a direct elimination from the argument pointer to the stack pointer; the attached patch rectifies that. Regression tested with the avr simulator. OK to apply?
fb_offset-fix
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