Re: [PATCH v5 06/18] RISC-V: Add ADD_ANDI macro-fusion recognition

On 8/13/2026 11:57 PM, Jin Ma wrote:
> Recognize ADD/ADDI-type instructions followed by ANDI when the result
> register forms the required dependency.  Parameterize the ANDI
> classifier so the new recognizer and existing B_ALUI logic share RTL
> parsing.
>
> Leave the fusion disabled by default.
>
> gcc/ChangeLog:
>
> 	* config/riscv/riscv-fusion.cc (riscv_insn_is_add_addi_p): New
> 	function.
> 	(riscv_insn_is_andi_type_p): Likewise.
> 	(riscv_fuse_b_alui): Reuse the ANDI matcher.
> 	(riscv_fuse_add_andi): New function.
> 	(riscv_fusion_table): Add RISCV_FUSE_ADD_ANDI.
> 	* config/riscv/riscv-protos.h (enum riscv_fusion_pairs): Add
> 	RISCV_FUSE_ADD_ANDI.
>
> gcc/testsuite/ChangeLog:
>
> 	* gcc.target/riscv/fusion-add-addi-andi.c: New test.
> 	* gcc.target/riscv/fusion-mv-li-andi-rtl.c: Likewise.
> 	* gcc.target/riscv/fusion-special-positive-rtl-add-andi.c: Likewise.
>
> Signed-off-by: Jin Ma <[email protected]>
OK once prerequisites are approved.

jeff