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Refactor - reduce usage of REGISTER_OTHER_SCRATCH
#596
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…NAL_FUNCTION_CALL_PROLOGUE.
…AL_FUNCTION_CALL_REG.
LucasSte
reviewed
Sep 26, 2024
| self.emit_ins(X86Instruction::store(OperandSize::S64, REGISTER_MAP[0], REGISTER_OTHER_SCRATCH, X86IndirectAccess::Offset(std::mem::size_of::<u64>() as i32))); // result.return_value = R0; | ||
| self.emit_ins(X86Instruction::load_immediate(OperandSize::S64, REGISTER_MAP[0], 0)); | ||
| if self.config.enable_instruction_meter { | ||
| self.emit_ins(X86Instruction::alu(OperandSize::S64, 0x29, REGISTER_SCRATCH, REGISTER_INSTRUCTION_METER, 0, None)); // REGISTER_INSTRUCTION_METER -= pc; |
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This operation is re-emitted in ANCHOR_EXIT, even though REGISTER_SCRATCH is zero.
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I haven't checked the other PR for removing REGISTER_OTHER_SCRATCH yet, so, please, ignore this comment if this is solved there.
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You mean the code for the instruction metering is redundant to that in ANCHOR_EPILOGUE, which is on purpose. Because REGISTER_SCRATCH is clobbered here and then zeroed out so that it is not double metered later.
LucasSte
approved these changes
Sep 26, 2024
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Reduces the machinecode emitted for: