[mlir] feat: add mlirFuncSetResultAttr

[avik-pal]

cc @ftynse @wsmoses

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[llvmbot]

@llvm/pr-subscribers-mlir

Author: Avik Pal (avik-pal)

Changes

cc @ftynse @wsmoses

---

Full diff: https://github.com/llvm/llvm-project/pull/125972.diff

2 Files Affected:

• (modified) mlir/include/mlir-c/Dialect/Func.h (+4)
• (modified) mlir/lib/CAPI/Dialect/Func.cpp (+6)

diff --git a/mlir/include/mlir-c/Dialect/Func.h b/mlir/include/mlir-c/Dialect/Func.h
index 1df759f0e8e3fe0..001f915af1054f0 100644
--- a/mlir/include/mlir-c/Dialect/Func.h
+++ b/mlir/include/mlir-c/Dialect/Func.h
@@ -35,6 +35,10 @@ MLIR_CAPI_EXPORTED void mlirFuncSetArgAttr(MlirOperation op, intptr_t pos,
                                            MlirStringRef name,
                                            MlirAttribute attr);
 
+MLIR_CAPI_EXPORTED void mlirFuncSetResultAttr(MlirOperation op, intptr_t pos,
+                                              MlirStringRef name,
+                                              MlirAttribute attr);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/mlir/lib/CAPI/Dialect/Func.cpp b/mlir/lib/CAPI/Dialect/Func.cpp
index 942e090fdfc19d7..8265b61b9842691 100644
--- a/mlir/lib/CAPI/Dialect/Func.cpp
+++ b/mlir/lib/CAPI/Dialect/Func.cpp
@@ -19,3 +19,9 @@ void mlirFuncSetArgAttr(MlirOperation op, intptr_t pos, MlirStringRef name,
   llvm::cast<mlir::func::FuncOp>(unwrap(op))
       .setArgAttr(pos, unwrap(name), unwrap(attr));
 }
+
+void mlirFuncSetResultAttr(MlirOperation op, intptr_t pos, MlirStringRef name,
+                           MlirAttribute attr) {
+  llvm::cast<mlir::func::FuncOp>(unwrap(op))
+      .setResultAttr(pos, unwrap(name), unwrap(attr));
+}

[wsmoses]

This looks fine to me, but probably we should consider making C bindings to FunctionOpInterface more generally here (if we want to handle gpu.func or llvm.func's in the future).

Let @ftynse review first (and then feel free to merge)

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