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gcc/ * config.gcc: Add riscv-shorten-memrefs.o to extra_objs for riscv. * config/riscv/riscv-passes.def: New file. * config/riscv/riscv-protos.h (make_pass_shorten_memrefs): Declare. * config/riscv/riscv-shorten-memrefs.c: New file. * config/riscv/riscv.c (tree-pass.h): New include. (riscv_compressed_reg_p): New Function (riscv_compressed_lw_offset_p): Likewise. (riscv_compressed_lw_address_p): Likewise. (riscv_shorten_lw_offset): Likewise. (riscv_legitimize_address): Attempt to convert base + large_offset to compressible new_base + small_offset. (riscv_address_cost): Make anticipated compressed load/stores cheaper for code size than uncompressed load/stores. (riscv_register_priority): Move compressed register check to riscv_compressed_reg_p. * config/riscv/riscv.h (C_S_BITS): Define. (CSW_MAX_OFFSET): Define. * config/riscv/riscv.opt (mshorten-memefs): New option. * config/riscv/t-riscv (riscv-shorten-memrefs.o): New rule. (PASSES_EXTRA): Add riscv-passes.def. * doc/invoke.texi: Document -mshorten-memrefs. * config/riscv/riscv.c (riscv_new_address_profitable_p): New function. (TARGET_NEW_ADDRESS_PROFITABLE_P): Define. * doc/tm.texi: Regenerate. * doc/tm.texi.in (TARGET_NEW_ADDRESS_PROFITABLE_P): New hook. * sched-deps.c (attempt_change): Use old address if it is cheaper than new address. * target.def (new_address_profitable_p): New hook. * targhooks.c (default_new_address_profitable_p): New function. * targhooks.h (default_new_address_profitable_p): Declare. gcc/testsuite/ * gcc.target/riscv/shorten-memrefs-1.c: New test. * gcc.target/riscv/shorten-memrefs-2.c: New test. * gcc.target/riscv/shorten-memrefs-3.c: New test. * gcc.target/riscv/shorten-memrefs-4.c: New test. * gcc.target/riscv/shorten-memrefs-5.c: New test. * gcc.target/riscv/shorten-memrefs-6.c: New test. * gcc.target/riscv/shorten-memrefs-7.c: New test.
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