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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.
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