Add support to create a new attribute from multiple attributes. It extended the
DagNode class to represent attribute creation dag. It also changed the
RewriterGen::emitOpCreate method to support this nested dag emit.
An unit test is added.
PiperOrigin-RevId: 238090229
This CL added the ability to generate multiple ops using multiple result
patterns, with each of them replacing one result of the matched source op.
Specifically, the syntax is
```
def : Pattern<(SourceOp ...),
[(ResultOp1 ...), (ResultOp2 ...), (ResultOp3 ...)]>;
```
Assuming `SourceOp` has three results.
Currently we require that each result op must generate one result, which
can be lifted later when use cases arise.
To help with cases that certain output is unused and we don't care about it,
this CL also introduces a new directive: `verifyUnusedValue`. Checks will
be emitted in the `match()` method to make sure if the corresponding output
is not unused, `match()` returns with `matchFailure()`.
PiperOrigin-RevId: 237513904
Previously we were using PatternRewrite::replaceOpWithNewOp() to both create the new op
inline and rewrite the matched op. That does not work well if we want to generate multiple
ops in a sequence. To support that, this CL changed to assign each newly created op to a
separate variable.
This CL also refactors how PatternEmitter performs the directive dispatch logic.
PiperOrigin-RevId: 233206819
This CL added a tblgen::DagLeaf wrapper class with several helper methods for handling
DAG arguments. It helps to refactor the rewriter generation logic to be more higher
level.
This CL also added a tblgen::ConstantAttr wrapper class for constant attributes.
PiperOrigin-RevId: 232050683
This allow for arbitrarily complex builder patterns which is meant to cover initial cases while the modelling is improved and long tail cases/cases for which expanding the DSL would result in worst overall system.
NFC just sorting the emit replace methods alphabetical in the class and file body.
PiperOrigin-RevId: 231890352
Similar to other tblgen:: abstractions, tblgen::Pattern hides the native TableGen
API and provides a nicer API that is more coherent with the TableGen definitions.
PiperOrigin-RevId: 231285143
Feng Liu