[llvm-dev] meaning of $ in tablegen

[Rail Shafigulin via llvm-dev]

What is the meaning of a $ sign in tablgen? Here is an example


// Pattern fragments
def vextract_sext_i8 : PatFrag<(ops node:$vec, node:$idx),
                                              (MipsVExtractSExt node:$vec,
node:$idx, i8)>;

Taken from

https://github.com/llvm-mirror/llvm/blob/fd031a51c35d1781c066a42e221a7ae28610be3f/lib/Target/Mips/MipsMSAInstrInfo.td#L118

-- 
Rail Shafigulin
Software Engineer
Esencia Technologies
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