[LLVMdev] initialize 'dag' variable and interpret asmstring in tablegen .td file

[Tzu-Chien Chiu]

llvm/lib/Target/X86/X86InstrInfo.td:


class X86Inst<bits<8> opcod, Format f, ImmType i, dag ops, string
AsmStr>  : Instruction {
    ....
    dag OperandList = ops;
    string AsmString = AsmStr;
}

def MOV32mi : Ii32<0xC7, MRM0m, (ops i32mem:$dst, i32imm:$src),
                   "mov{l} {$src, $dst|$dst, $src}">;

I cannot find any document on initializing the 'dag' type variable,
and I cannot understand the syntax of "asmstring" either.

how does the x86 asmwrite interpret the "AsmString" ?