================
@@ -321,17 +321,38 @@ convertABIArgInfo(const llvm::abi::ArgInfo &info,
MLIRContext *ctx,
return ArgClassification::getIgnore();
}
+/// The number of leading arguments the classifier must treat as declared
+/// parameters, which is meaningful only for a variadic signature: an argument
+/// past the ellipsis is unnamed, and the x86_64 rules pass some unnamed types
+/// differently. std::nullopt for a non-variadic signature, where every
----------------
adams381 wrote:
The return value is `FunctionInfo::create`'s `NumRequired` parameter, read back
by two accessors in `llvm/ABI/FunctionInfo.h`, outside this pass:
```c++
bool isVariadic() const { return NumRequired.has_value(); }
unsigned getNumRequiredArgs() const {
return isVariadic() ? *NumRequired : arg_size();
}
```
The reason is `isVariadic()`, which would answer true for every function.
https://github.com/llvm/llvm-project/pull/213315
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