forked from OSchip/llvm-project
6d6fe9ccc4
The "else" group of an optional element is a collection of elements that get parsed/printed when the anchor of the main element group is *not* present. This is useful when there is a special syntax when an element is not present. The new syntax for an optional element is shown below:
```
optional-group: `(` elements `)` (`:` `(` else-elements `)`)? `?`
```
An example of how this might be used is shown below:
```tablegen
def FooOp : ... {
let arguments = (ins UnitAttr:$foo);
let assemblyFormat = "attr-dict (`foo_is_present` $foo^):(`foo_is_absent`)?";
}
```
would be formatted as such:
```mlir
// When the `foo` attribute is present:
foo.op foo_is_present
// When the `foo` attribute is not present:
foo.op foo_is_absent
```
Differential Revision: https://reviews.llvm.org/D99129
|
||
|---|---|---|
| .. | ||
| Bindings | ||
| Dialects | ||
| Rationale | ||
| Tools | ||
| Tutorials | ||
| includes/img | ||
| BufferDeallocationInternals.md | ||
| Bufferization.md | ||
| CAPI.md | ||
| CMakeLists.txt | ||
| Canonicalization.md | ||
| ConversionToLLVMDialect.md | ||
| DataLayout.md | ||
| DebugActions.md | ||
| DeclarativeRewrites.md | ||
| Diagnostics.md | ||
| DialectConversion.md | ||
| EDSC.md | ||
| Interfaces.md | ||
| LLVMDialectMemRefConvention.md | ||
| LangRef.md | ||
| OpDefinitions.md | ||
| PassManagement.md | ||
| Passes.md | ||
| PatternRewriter.md | ||
| Quantization.md | ||
| README.txt | ||
| SPIRVToLLVMDialectConversion.md | ||
| ShapeInference.md | ||
| SymbolsAndSymbolTables.md | ||
| Traits.md | ||
| doxygen-mainpage.dox | ||
| doxygen.cfg.in | ||
README.txt
MLIR documentation ================== Please note mlir.llvm.org is where MLIR's rendered documentation is displayed. The viewing experience on GitHub or elsewhere may not match those of the website. For any changes please verify instead that they work on the main website first. See https://github.com/llvm/mlir-www for the website generation information.