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This patch is similar to r15-5569 (tweak ashift:SI) but for ashiftrt and lshiftrt codes. It splits constant shift offsets > 16 into a 3-operand byte shift and a 2-operand residual bit shift. Moreover, some of the constraint alternatives have been promoted to 3-operand alternatives regardless of options. For example, ashift:HI and lshiftrt:HI can support 3 operands for offsets 9...12 without any overhead. Apart from that, it's a bit of code clean up for 2-byte and 4-byte shift insns: Use one RTL peephole with any_shift code iterator instead of 3 individual peepholes. It also removes some useless split insns; presumably introduced during the cc0 -> CCmode work. PR target/117726 gcc/ * config/avr/avr-passes.cc (avr_split_shift): Also handle ASHIFTRT and LSHIFTRT codes for 4-byte shifts. (constr_split_shift4): New code_attr. (avr_emit_shift): Adjust to new shift capabilities. * config/avr/predicates.md (scratch_or_d_register_operand): rename to scratch_or_dreg_operand. * config/avr/avr.md: Same. (define_peephole2): Write the RTL scratch peephole for 2-byte and 4-byte shifts that generates *sh*<mode>3_const insns using code iterator any_shift. (*ashlhi3_const_split, *ashrhi3_const_split, *ashrhi3_const_split) (*lshrsi3_const_split, *lshrhi3_const_split): Remove useless split insns. (define_split) [avropt_split_bit_shift]: Add splitters for 4-byte ASHIFTRT and LSHIFTRT insns using avr_split_shift(). (ashrsi3, *ashrsi3, *ashrsi3_const): Add "r,0,C4a" and "r,r,C4a" constraint alternatives depending on 2op, 3op. (lshrsi3, *lshrsi3, *lshrsi3_const): Add "r,0,C4r" and "r,r,C4r" constraint alternatives depending on 2op, 3op. Add "r,r,C15". (lshrhi3, *lshrhi3, *lshrhi3_const, ashlhi3, *ashlhi3) (*ashlhi3_const): Add "r,r,C7c" alternative. (ashrpsi, *ashrpsi3): Add "r,r,C22" alternative. (ashlqi, *ashlqi): Turn C06 alternative into "r,r,C06". * config/avr/constraints.md (C14, C22, C30, C7c): New constraints. * config/avr/avr.cc (ashlhi3_out, lshrhi3_out) [case 7, 9, 10, 11, 12]: Support as 3-operand insn. (lshrsi3_out) [case 15]: Same. (ashrsi3_out) [case 30]: Same. (ashrhi3_out) [case 14]: Same. (ashrqi3_out) [case 6]: Same. (avr_out_ashrpsi3) [case 22]: Same. * config/avr/avr.h: Fix comment typo. * doc/invoke.texi (AVR Options) <-msplit-bit-shift>: Document. |
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