https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97417
--- Comment #60 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jim Wilson <wil...@gcc.gnu.org>: https://gcc.gnu.org/g:a4953810bac524e19126a2745c75fed58db962c2 commit r11-7236-ga4953810bac524e19126a2745c75fed58db962c2 Author: Jim Wilson <j...@sifive.com> Date: Sat Feb 13 12:13:08 2021 -0800 RISC-V: Shorten memrefs improvement, partial fix 97417. We already have a check for riscv_shorten_memrefs in riscv_address_cost. This adds the same check to riscv_rtx_costs. Making this work also requires a change to riscv_compressed_lw_address_p to work before reload by checking the offset and assuming any pseudo reg is OK. Testing shows that this consistently gives small code size reductions. gcc/ PR target/97417 * config/riscv/riscv.c (riscv_compressed_lw_address_p): Drop early exit when !reload_completed. Only perform check for compressed reg if reload_completed. (riscv_rtx_costs): In MEM case, when optimizing for size and shorten memrefs, if not compressible, then increase cost.
