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What is the exact meaning of "match_dup"? the following is extracted from "mips.md" (define_expand "movsicc" [(set (match_dup 4) (match_operand 1 "comparison_operator" "")) (set (match_operand:SI 0 "register_operand" "") (if_then_else:SI (match_dup 5) (match_operand:SI 2 "reg_or_0_operand" "") (match_operand:SI 3 "reg_or_0_operand" "")))] "mips_isa >= 4" " { gen_conditional_move (operands); DONE; }") Now? what is the meaning of "match_dup" in the machine description above? what does it "duplicate"? Operand(4)? where is the original Operand(4)?
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