Re: [PATCH v5 12/18] RISC-V: Add PREINDEX_ST macro-fusion recognition

On 8/14/2026 12:00 AM, Jin Ma wrote:
> Recognize a non-word ADDI-type in-place address update followed by a
> scalar integer or floating-point store.  Reuse the indexed-memory helper
> shared with LDPREINCREMENT, including its store-source constraint.
>
> Leave the fusion disabled by default and XFAIL its positive dump
> checks until a CPU enables it.
>
> gcc/ChangeLog:
>
> 	* config/riscv/riscv-fusion.cc (riscv_fuse_preindex_st): New
> 	function.
> 	(riscv_fusion_table): Add RISCV_FUSE_PREINDEX_ST.
> 	* config/riscv/riscv-protos.h (enum riscv_fusion_pairs): Add
> 	RISCV_FUSE_PREINDEX_ST.
>
> gcc/testsuite/ChangeLog:
>
> 	* gcc.target/riscv/fusion-memory-rtl-shapes-preindex-st.c: New test.
> 	* gcc.target/riscv/fusion-preindex-st.c: Likewise.
OK once prerequisites are approved.

jeff