[Mlir-commits] [clang] [mlir] [CIR][mlir][ABI] Add IndirectAliased (byref) argument lowering (PR #230415)

[llvmlistbot at llvm.org]

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@@ -290,6 +321,16 @@ mlir::ArrayAttr updateArgAttrs(mlir::MLIRContext *ctx,
                       dl.getTypeSize(pointeeTy).getFixedValue()));
       }
       newArgAttrs.push_back(attrs.getDictionary(ctx));
+    } else if (ac.kind == ArgKind::IndirectAliased) {
+      // llvm.byref(T) records the pre-rewrite arg type, as llvm.byval does.
+      mlir::NamedAttrList attrs(existing);
+      attrs.set(mlir::LLVM::LLVMDialect::getAlignAttrName(),
+                builder.getI64IntegerAttr(ac.indirectAlign.value()));
+      attrs.set(mlir::LLVM::LLVMDialect::getNoUndefAttrName(),
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skc7 wrote:

Rebased on latest main and gated `noundef` on `enableNoundefAttrs`.

https://github.com/llvm/llvm-project/pull/230415