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ZengNan wrote: > I don't understand the use of match_dup, even if I've read GCC Internals. For example, in mips.md, > > (define_expand "seq" > [(set (match_operand:SI 0 "register_operand" "=d") > (eq:SI (match_dup 1) (match_dup 2)))] > .... It means that the corresponding parameters are exactly the same as parameters 1 and 2. In a define_insn, they'd be in the pattern, but in define_expand, they're often generated in the body of the definition, where operands[1] and operands[2] are defined. > and in i386.md, > > (define_expend "seq" > [(match_dup 1) > (set (match_operand:QI 0 "register_operand" "") > (eq:QI (cc0) (const_int 0)))] > ...... > > What does "match_dup" means in the two patterns? Similarly here. - ken ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sourceware.org
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