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Re: [patch,avr] Slightly better memory accesses on avr_tiny


2016-07-19 13:31 GMT+03:00 Georg-Johann Lay <avr@gjlay.de>:
> This patch tries to improve the bloated code we are currently generating for
> AVR_TINY.  It's mostly about printing the memory loads and stores and more
> usage of reg_unused_after to print shorter instruction sequences in some
> cases.
>
> Ok for trunk?
>
> I also played around with PLUS in legitimate_address_p and
> legitimize_address and got better code, but the problem with such changes is
> that almost all tests for such small devices are failing and no reasonable
> portion of the testsuite will pass.
>
> I don't even know if anybody is using avr_tiny + avr-gcc or if users are
> resorting to assembler.
>

Keep Calm and Carry On
;-)

> Johann
>
>
> gcc/
>         (avr_legitimize_address) [AVR_TINY]: Force constant addresses
>         outside [0,0xc0] into a register.
>         (avr_out_movhi_r_mr_reg_no_disp_tiny): Pass insn.  And handle
>         cases where the base address register is unused after.
>         (avr_out_movhi_r_mr_reg_disp_tiny): Same.
>         (avr_out_movhi_mr_r_reg_disp_tiny): Same.
>         (avr_out_store_psi_reg_disp_tiny): Same.
>
> gcc/testsuite/
>         * gcc.target/avr/torture/get-mem.c: New test.
>         * gcc.target/avr/torture/set-mem.c: New test.

Approved.


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