Re: [PATCH v5 02/18] RISC-V: Refine macro-fusion helpe r predicates

  Ping :)

> Factor common RTL parsing out of the existing macro-fusion
> recognizers.  Preserve aggressive destination overmatching before
> register allocation while checking real producer-consumer dependencies
> in both scheduling passes.
> 
> Use parameterized arithmetic and memory classifiers so later fusion
> recognizers can share structural matching without duplicating
> microarchitecture-specific constraints.
> 
> gcc/ChangeLog:
> 
>  * config/riscv/riscv-fusion.cc: Include insn-attr.h.
>  (riscv_fuse_sets_p): New function.
>  (riscv_set_extract_word_binary_p): Likewise.
>  (riscv_regno): Likewise.
>  (riscv_fuse_same_reg_p): Likewise.
>  (riscv_fuse_same_dest_p): Rename from
>  riscv_fusion_same_dest_p and handle hard-register SUBREGs.  Preserve
>  preallocation destination overmatching and optionally check the
>  first-source dependency.
>  (riscv_set_is_addiw_p): New function.
>  (riscv_insn_is_mv_li_p): Likewise.
>  (riscv_insn_is_addi_type_p): Likewise.
>  (riscv_set_is_shift_p): Likewise.
>  (riscv_set_is_slli_p): Likewise.
>  (riscv_set_is_srli_p): Likewise.
>  (riscv_set_is_srai_p): Likewise.
>  (enum sched_fusion_type): New enum.
>  (riscv_fusion_mem_info): New struct.
>  (riscv_fuse_extract_address): New function.
>  (riscv_fuse_mem_p): Likewise.
>  (riscv_fuse_zext_common): Require RV64 and use the common
>  helpers.
>  (riscv_fuse_zextw): Update accordingly.
>  (riscv_fuse_zextws): Likewise.
>  (riscv_fuse_zexth): Likewise.
>  (riscv_fuse_ldindexed): Use the common helpers.
>  (riscv_fuse_expanded_ld): Likewise.
>  (riscv_fuse_ldpreincrement): Likewise.  Check the update dependency.
>  (riscv_fuse_lui_addi): Reuse the ADDI matcher, check the source
>  dependency, and reject zero-valued LUI patterns.
>  (riscv_fuse_auipc_addi): Reuse the ADDI matcher and check the source
>  dependency.
>  (riscv_fuse_lui_ld): Use the common helpers.
>  (riscv_fuse_auipc_ld): Likewise.  Check the address dependency.
>  (riscv_fuse_aligned_std): Use the common helpers.
>  (riscv_fuse_bfext): Likewise.
>  (riscv_fuse_b_alui): Likewise.
> 
> gcc/testsuite/ChangeLog:
> 
>  * gcc.target/riscv/fusion-lui-addi-prera-rtl.c: New test.
>