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Question about "match_dup"
- From: <fishbaoz at hotmail dot com>
- To: <gcc at gcc dot gnu dot org>
- Date: Mon, 8 Sep 2003 09:08:44 +0800
- Subject: Question about "match_dup"
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)?