dev experienceenhancementgood first issuehigh reward
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描述
Some numbers from a --target=riscv --exp_cut=99999 build (9a0180e sexpr-bootstrap):
1069060 cml_x64Prog_x64_enc_5306
990976 cml_arm7Prog_arm7_enc_5296
938348 cml_riscvProg_riscv_enc_5348
784956 cml_arm8Prog_arm8_enc_5342
373572 cml_mipsProg_mips_enc_5352
291168 cml_ag32_enc_5324
Some of this is probably unavoidable with heap-allocated words but looking at the HOL input to the translator in riscvProgScript and x64ProgScript we seem to be forcing the encoders into a highly canonical form where no logic can be shared between different instructions; particularly notable are the 16 reg/imm (not)(lower, less, equal, test) cases of JumpCmp which result in 16 copies of the logic to encode a conditional jump displacement. Improving the pre-translate conversions here could make the bootstrap significantly faster with no effect whatsoever on compiling things in the logic.