mlir: Add scf-add-vector-acc pass and use in the nvgpu pipeline

src/xtc/backends/mlir/MlirBindingsExtensions.py

@@ -15,7 +15,10 @@
 # Optional XTC extensions to the MLIR Python bindings: the module to import
 # mapped to the pass-pipeline entries it contributes.
 _EXTENSIONS: dict[str, tuple[str, ...]] = {
-    "mlir.xtc_transform": ("func.func(reduce-extract-slices)",),
+    "mlir.xtc_transform": (
+        "func.func(reduce-extract-slices)",
+        "scf-add-vector-acc",
+    ),
 }
 
 # Reverse map from a contributed pass to its providing module, so a pass can be

src/xtc/backends/mlir/MlirTarget/MlirNVGPUTarget.py

@@ -34,6 +34,7 @@
 from .MlirTarget import MlirTarget
 from ..MlirConfig import MlirConfig
 from ..MlirProgram import RawMlirProgram
+import xtc.backends.mlir.MlirBindingsExtensions as binding_extensions
 
 __all__ = ["MlirNVGPUTarget"]
 
@@ -437,7 +438,7 @@ def __init__(
         self._mlir_program = mlir_program
 
     def _lowering_pipeline(self, sm_arch: str, ptx_version: str) -> list[str]:
-        return [
+        return binding_extensions.passes(["scf-add-vector-acc"]) + [
             "canonicalize",
             "cse",
             "sccp",