I'm planning to migrate StringRef to std::string_view
eventually. Since std::string_view does not have slice, this patch
migrates:
slice(0, N) to substr(0, N)
slice(N, StringRef::npos) to substr(N)
As specified in the docs,
1) raw_string_ostream is always unbuffered and
2) the underlying buffer may be used directly
( 65b13610a5226b84889b923bae884ba395ad084d for further reference )
* Don't call raw_string_ostream::flush(), which is essentially a no-op.
* Avoid unneeded calls to raw_string_ostream::str(), to avoid excess indirection.
This commit adds the initial version of the mlir-query tool, which leverages the pre-existing matchers defined in mlir/include/mlir/IR/Matchers.h
The tool provides the following set of basic queries:
hasOpAttrName(string)
hasOpName(string)
isConstantOp()
isNegInfFloat()
isNegZeroFloat()
isNonZero()
isOne()
isOneFloat()
isPosInfFloat()
isPosZeroFloat()
isZero()
isZeroFloat()
Reviewed By: jpienaar
Differential Revision: https://reviews.llvm.org/D155127
