пт, 29 нояб. 2024 г. в 21:07, Georg-Johann Lay <a...@gjlay.de>: > > This patch splits 2-byte and 3-byte shifts after reload into > a 3-operand byte shift and a residual 2-operand shift. > > The "2op" shift insn alternatives are not needed and removed because > all shift insn already have a "r,0,n" alternative that does the job. > > Ok for trunk?
Please apply. Denis. > > Johann > > -- > > > AVR: target/117726 - Better optimize shifts. > > This patch splits 2-byte and 3-byte shifts after reload into > a 3-operand byte shift and a residual 2-operand shift. > > The "2op" shift insn alternatives are not needed and removed because > all shift insn already have a "r,0,n" alternative that does the job. > > PR target/117726 > gcc/ > * config/avr/avr-passes.cc (avr_shift_is_3op, avr_emit_shift): > Also handle 2-byte and 3-byte shifts. > (avr_split_shift4, avr_split_shift3, avr_split_shift2): New > local helper functions. > (avr_split_shift): Use them. > * config/avr/avr-passes.def (avr_pass_split_after_peephole2): > Adjust comments. > * config/avr/avr.cc (avr_out_ashlpsi3, avr_out_ashrpsi3) > (avr_out_lshrpsi3): Support offset 15. > (ashrhi3_out): Support offset 7 as 3-op. > (ashrsi3_out): Support offset 15. > (avr_rtx_costs_1): Adjust shift costs. > * config/avr/avr.md (2op): Remove attribute value and all such insn > alternatives. > (ashlhi3, *ashlhi3, *ashlhi3_const): Add 3-op alternatives like C2l. > (ashrhi3, *ashrhi3, *ashrhi3_const): Add 3-op alternatives like C2a. > (lshrhi3, *lshrhi3, *lshrhi3_const): Add 3-op alternatives like C2r. > (*ashlpsi3_split, *ashlpsi3): Add 3-op alternatives C15 and C3l. > (*ashrpsi3_split, *ashrpsi3): Add 3-op alternatives C15 and C3r. > (*lshrpsi3_split, *lshrpsi3): Add 3-op alternatives C15 and C3r. > (ashlsi3, *ashlsi3, *ashlsi3_const): Remove "2op" alternative. > (ashrsi3, *ashrsi3, *ashrsi3_const): Same. > (lshrsi3, *lshrsi3, *lshrsi3_const): Same. > (constr_split_suffix): Code attr morphed from constr_split_shift4. > * config/avr/constraints.md (C2a, C2r, C2l) > (C3a, C3r, C3l): New constraints. > * doc/invoke.texi (AVR Options) <-msplit-bit-shift>: Adjust doc.
