On Fri, Aug 09, 2019 at 01:34:36PM -0400, Vladimir Makarov wrote:
     
     If you provide LRA dump for such test (it is better to use
     -fira-verbose=15 to output full RA info into stderr), I probably could
     say more.

I've attached such a dump (generated from gcc/testsuite/gcc.c-torture/compile/pr53410-2.c).
     
     The less regs the architecture has, thoke easier to run into such error
     message if something described wrong in the back-end.?? I see your
     architecture is 16-bit micro-controller with only 8 regs, some of them is
     specialized.?? So your architecture is really register constrained.

That's not quite correct.  It is a 24-bit micro-controller (the address
space is 24 bits wide).  There are 2 address registers (plus stack
pointer and program counter) and there are 8 general purpose data
registers (of differing sizes).
     

J'

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