Improve code generation for pdp11 target

Programming / Compilers / GCC - pkoning [138bc75d-0d04-0410-961f-82ee72b054a4] - 9 July 2018 14:00 EDT

- config/pdp11/pdp11.c (pdp11_addr_cost): New function. (pdp11_insn_cost): New function. (pdp11_md_asm_adjust): New function. (TARGET_INVALID_WITHIN_DOLOOP): Define. (pdp11_rtx_costs): Update to match machine better. (output_addr_const_pdp11): Correct format mismatch warnings.
- config/pdp11/pdp11.h (SLOW_BYTE_ACCESS): Correct definition.
- config/pdp11/ General change to add base_cost and/or length attributes for use by new pdp11_insn_cost function. (MIN_BRANCH): Correct definition. (MIN_SOB): Ditto. (doloop_end): Use standard pattern name for looping pattern. (doloop_end_nocc): New. (movsf): Add another constraint alternative. (zero_extendqihi2): Add constraint alternatives for not in place extend. (zero_extendhisi2): Remove. (shift patterns): Add CC handling variants. (bswaphi2): New. (bswapsi2): New. (rothi3): New. (define_peephole2): New peephole to recognize mov that sets CC for subsequent test.

449d9e9b812 Improve code generation for pdp11 target.
gcc/ChangeLog | 26 +++
gcc/config/pdp11/pdp11.c | 408 +++++++++++++++++++++++-----------
gcc/config/pdp11/pdp11.h | 8 +-
gcc/config/pdp11/ | 552 +++++++++++++++++++++++++++++++++++-----------
4 files changed, 732 insertions(+), 262 deletions(-)


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