[TVMC] add the support of the cross compiler options

Add the possibility to provide the cross compiler options when using the
tvmc compile functionality.
With some cross compiler, toolchains --sysroot option (at least) need to be
defined.

tvmc/test_compile.py as been updated to introduce simple tests to validate
the cross options functionnality.

Signed-off-by: Vincent ABRIOU <vincent.abriou@st.com>

python/tvm/driver/tvmc/compiler.py

@@ -47,6 +47,11 @@ def add_compile_parser(subparsers):
         default="",
         help="the cross compiler to generate target libraries, e.g. 'aarch64-linux-gnu-gcc'",
     )
+    parser.add_argument(
+        "--cross-compiler-options",
+        default="",
+        help="the cross compiler options to generate target libraries, e.g. '-mfpu=neon-vfpv4'",
+    )
     parser.add_argument(
         "--desired-layout",
         choices=["NCHW", "NHWC"],
@@ -126,6 +131,7 @@ def drive_compile(args):
         tuning_records=args.tuning_records,
         package_path=args.output,
         cross=args.cross_compiler,
+        cross_options=args.cross_compiler_options,
         dump_code=dump_code,
         target_host=None,
         desired_layout=args.desired_layout,
@@ -141,6 +147,7 @@ def compile_model(
     tuning_records: Optional[str] = None,
     package_path: Optional[str] = None,
     cross: Optional[Union[str, Callable]] = None,
+    cross_options: Optional[str] = None,
     export_format: str = "so",
     dump_code: Optional[List[str]] = None,
     target_host: Optional[str] = None,
@@ -168,6 +175,8 @@ def compile_model(
         be saved in a temporary directory.
     cross : str or callable object, optional
         Function that performs the actual compilation
+    cross_options : str, optional
+        Command line options to be passed to the cross compiler.
     export_format : str
         What format to use when saving the function library. Must be one of "so" or "tar".
         When compiling for a remote device without a cross compiler, "tar" will likely work better.
@@ -252,7 +261,9 @@ def compile_model(
         dumps[source_type] = source
 
     # Create a new tvmc model package object from the graph definition.
-    package_path = tvmc_model.export_package(graph_module, package_path, cross, export_format)
+    package_path = tvmc_model.export_package(
+        graph_module, package_path, cross, cross_options, export_format
+    )
 
     # Write dumps to file.
     if dumps:

python/tvm/driver/tvmc/model.py

@@ -180,6 +180,7 @@ def export_package(
         executor_factory: GraphExecutorFactoryModule,
         package_path: Optional[str] = None,
         cross: Optional[Union[str, Callable]] = None,
+        cross_options: Optional[str] = None,
         lib_format: str = "so",
     ):
         """Save this TVMCModel to file.
@@ -192,6 +193,8 @@ def export_package(
             If not provided, the package will be saved to a generically named file in tmp.
         cross : str or callable object, optional
             Function that performs the actual compilation.
+        cross_options : str, optional
+            Command line options to be passed to the cross compiler.
         lib_format : str
             How to export the modules function library. Must be one of "so" or "tar".
 
@@ -214,9 +217,14 @@ def export_package(
         if not cross:
             executor_factory.get_lib().export_library(path_lib)
         else:
-            executor_factory.get_lib().export_library(
-                path_lib, tvm.contrib.cc.cross_compiler(cross)
-            )
+            if not cross_options:
+                executor_factory.get_lib().export_library(
+                    path_lib, tvm.contrib.cc.cross_compiler(cross)
+                )
+            else:
+                executor_factory.get_lib().export_library(
+                    path_lib, tvm.contrib.cc.cross_compiler(cross, options=cross_options.split(" "))
+                )
         self.lib_path = path_lib
 
         with open(temp.relpath(graph_name), "w") as graph_file:

tests/python/driver/tvmc/test_compiler.py

@@ -29,6 +29,8 @@
 from tvm.driver import tvmc
 from tvm.driver.tvmc.model import TVMCPackage
 
+from tvm.contrib import utils
+
 
 def test_save_dumps(tmpdir_factory):
     tmpdir = tmpdir_factory.mktemp("data")
@@ -92,6 +94,33 @@ def test_cross_compile_aarch64_tflite_module(tflite_mobilenet_v1_1_quant):
     assert os.path.exists(dumps_path)
 
 
+# This test will be skipped if the AArch64 cross-compilation toolchain is not installed.
+@pytest.mark.skipif(
+    not shutil.which("aarch64-linux-gnu-gcc"), reason="cross-compilation toolchain not installed"
+)
+def test_cross_compile_options_aarch64_tflite_module(tflite_mobilenet_v1_1_quant):
+    pytest.importorskip("tflite")
+
+    fake_sysroot_dir = utils.tempdir().relpath("")
+
+    tvmc_model = tvmc.load(tflite_mobilenet_v1_1_quant)
+    tvmc_package = tvmc.compile(
+        tvmc_model,
+        target="llvm -device=arm_cpu -mtriple=aarch64-linux-gnu -mattr='+neon'",
+        dump_code="asm",
+        cross="aarch64-linux-gnu-gcc",
+        cross_options="--sysroot=" + fake_sysroot_dir,
+    )
+    dumps_path = tvmc_package.package_path + ".asm"
+
+    # check for output types
+    assert type(tvmc_package) is TVMCPackage
+    assert type(tvmc_package.graph) is str
+    assert type(tvmc_package.lib_path) is str
+    assert type(tvmc_package.params) is bytearray
+    assert os.path.exists(dumps_path)
+
+
 def test_compile_keras__save_module(keras_resnet50, tmpdir_factory):
     # some CI environments wont offer tensorflow/Keras, so skip in case it is not present
     pytest.importorskip("tensorflow")
@@ -137,6 +166,34 @@ def test_cross_compile_aarch64_keras_module(keras_resnet50):
     assert os.path.exists(dumps_path)
 
 
+# This test will be skipped if the AArch64 cross-compilation toolchain is not installed.
+@pytest.mark.skipif(
+    not shutil.which("aarch64-linux-gnu-gcc"), reason="cross-compilation toolchain not installed"
+)
+def test_cross_compile_options_aarch64_keras_module(keras_resnet50):
+    # some CI environments wont offer tensorflow/Keras, so skip in case it is not present
+    pytest.importorskip("tensorflow")
+
+    fake_sysroot_dir = utils.tempdir().relpath("")
+
+    tvmc_model = tvmc.load(keras_resnet50)
+    tvmc_package = tvmc.compile(
+        tvmc_model,
+        target="llvm -device=arm_cpu -mtriple=aarch64-linux-gnu -mattr='+neon'",
+        dump_code="asm",
+        cross="aarch64-linux-gnu-gcc",
+        cross_options="--sysroot=" + fake_sysroot_dir,
+    )
+    dumps_path = tvmc_package.package_path + ".asm"
+
+    # check for output types
+    assert type(tvmc_package) is TVMCPackage
+    assert type(tvmc_package.graph) is str
+    assert type(tvmc_package.lib_path) is str
+    assert type(tvmc_package.params) is bytearray
+    assert os.path.exists(dumps_path)
+
+
 def verify_compile_onnx_module(model, shape_dict=None):
     # some CI environments wont offer onnx, so skip in case it is not present
     pytest.importorskip("onnx")
@@ -186,6 +243,34 @@ def test_cross_compile_aarch64_onnx_module(onnx_resnet50):
     assert os.path.exists(dumps_path)
 
 
+# This test will be skipped if the AArch64 cross-compilation toolchain is not installed.
+@pytest.mark.skipif(
+    not shutil.which("aarch64-linux-gnu-gcc"), reason="cross-compilation toolchain not installed"
+)
+def test_cross_compile_options_aarch64_onnx_module(onnx_resnet50):
+    # some CI environments wont offer onnx, so skip in case it is not present
+    pytest.importorskip("onnx")
+
+    fake_sysroot_dir = utils.tempdir().relpath("")
+
+    tvmc_model = tvmc.load(onnx_resnet50)
+    tvmc_package = tvmc.compile(
+        tvmc_model,
+        target="llvm -device=arm_cpu -mtriple=aarch64-linux-gnu -mattr=+neon",
+        dump_code="asm",
+        cross="aarch64-linux-gnu-gcc",
+        cross_options="--sysroot=" + fake_sysroot_dir,
+    )
+    dumps_path = tvmc_package.package_path + ".asm"
+
+    # check for output types
+    assert type(tvmc_package) is TVMCPackage
+    assert type(tvmc_package.graph) is str
+    assert type(tvmc_package.lib_path) is str
+    assert type(tvmc_package.params) is bytearray
+    assert os.path.exists(dumps_path)
+
+
 @tvm.testing.requires_opencl
 def test_compile_opencl(tflite_mobilenet_v1_0_25_128):
     pytest.importorskip("tflite")