[Hexagon] Remove sim_options from tvm.target.hexagon() (#11293)

We no longer run simulator automatically, so this is not necessary.
Also, the only way to pass options to the simulator was by setting
an environment variable. That variable (HEXAGON_SIM_ARGS) should
be set independently by the user from now on.

Author: Krzysztof Parzyszek

python/tvm/target/target.py

@@ -16,7 +16,6 @@
 # under the License.
 """Target data structure."""
 import json
-import os
 import re
 import warnings
 
@@ -586,11 +585,6 @@ def hexagon(cpu_ver="v66", **kwargs):
     -----------------------------
     hvx : int (default: 128)
         Size of HVX vector in bytes. Value of 0 disables HVX codegen.
-    sim_options : str or list of str (default: None)
-        User defined sim arguments. CPU version defaults to cpu_ver.
-        Otherwise, separate versions are used for codegen and sim. Not
-        all allowed cpu strings will be valid, simulator will throw an
-        error if invalid. Does not affect codegen.
     llvm_options : str or list of str (default: None)
         User defined compiler arguments.
     use_qfloat : bool (default: True for cpu_ver >= v68, False otherwise)
@@ -629,7 +623,6 @@ def get_arch_version(cpu_ver):
     arch_version = get_arch_version(cpu_ver)
     config = {
         "hvx": 128,
-        "sim_options": None,
         "llvm_options": None,
         "use_qfloat": arch_version >= 68,
         "use_ieee_fp": False,
@@ -638,10 +631,12 @@ def get_arch_version(cpu_ver):
     config.update(kwargs)
 
     # Warn about obsolete parameter names.
-    if config.get("sim_args"):
-        msg = "The keyword parameter 'sim_args' is deprecated, use 'sim_options' instead"
+    if config.get("sim_args") or config.get("sim_options"):
+        msg = (
+            "Setting simulator options in target is deprecated, set environment variable "
+            "HEXAGON_SIM_ARGS instead"
+        )
         warnings.warn(msg, stacklevel=2)
-        config.update({"sim_options": config["sim_args"]})
     if config.get("llvm_args"):
         msg = "The keyword parameter 'llvm_args' is deprecated, use 'llvm_options' instead"
         warnings.warn(msg, stacklevel=2)
@@ -678,65 +673,6 @@ def create_target_features(config):
 
         return target + mcpu + " " + create_target_features(config)
 
-    # Simulator options string
-    def create_sim_options(cpu_ver, config):
-        """Create simulator option string."""
-
-        def validate_hvx_length(codegen_hvx, sim_options):
-            if sim_options and "--hvx_length" in sim_options:
-                # If --hvx_length was specified, check HVX length of sim
-                # vs codegen
-                i = sim_options.index("hvx_length") + len("hvx_length") + 1
-                sim_hvx = sim_options[i : i + 3]
-                if sim_hvx != str(codegen_hvx):
-                    msg = "sim hvx {} and codegen hvx {} mismatch!".format(sim_hvx, codegen_hvx)
-                    # Set the stacklevel to the tvm.target.hexagon() call.
-                    warnings.warn(msg, stacklevel=4)
-            elif codegen_hvx != 0:
-                # If --hvx_length was not given, add it if HVX is enabled
-                sim_options = sim_options + " " if isinstance(sim_options, str) else ""
-                sim_options += "--hvx_length " + str(codegen_hvx)
-            return sim_options or ""
-
-        hvx = config["hvx"]
-        sim_options = config["sim_options"]
-        if not sim_options:
-            return cpu_ver + " " + validate_hvx_length(hvx, sim_options)
-
-        sim_cpu = cpu_ver + " "
-
-        # Add user defined args
-        if isinstance(sim_options, list):
-            sim_options = " ".join(sim_options)
-
-        # Check for supplied sim cpu version
-        if "v6" in sim_options:
-            sim_cpu = ""
-
-            # Regex match for allowed cpus
-            valid_cpu_str_regex = (
-                r"(?P<pre>--.*\s)?(--m)?"
-                + r"(?P<base_version>v6[25678])(?P<sub_version>[a-z])?"
-                + r"(?P<l2_size>_[0-9]+)?(?P<rev>_rev[0-9])?\s?(?P<post>--.*)?"
-            )
-            m = re.match(valid_cpu_str_regex, sim_options.lower())
-            if not m:
-                raise ValueError('Invalid simulator argument string "{}"'.format(sim_options))
-
-            # Parse options into correct order
-            cpu_attr = {x: str(m.groupdict()[x] or "") for x in m.groupdict()}
-            sim_options = (
-                cpu_attr["base_version"]
-                + cpu_attr["sub_version"]
-                + cpu_attr["l2_size"]
-                + cpu_attr["rev"]
-                + " "
-                + cpu_attr["pre"]
-                + cpu_attr["post"]
-            )
-
-        return sim_cpu + " " + validate_hvx_length(hvx, sim_options)
-
     # LLVM options string
     def create_llvm_options(cpu_ver, config):  # pylint: disable=unused-argument
         """Create LLVM options string."""
@@ -764,9 +700,6 @@ def create_tvm_options(cpu_ver, config):  # pylint: disable=unused-argument
                 opts += " --" + features[k] + "=" + str(config[k])
         return opts
 
-    # Sim args
-    os.environ["HEXAGON_SIM_ARGS"] = create_sim_options(cpu_ver, config)
-
     target_str = create_llvm_target(cpu_ver, config)
     llvm_str = create_llvm_options(cpu_ver, config)
     tvm_str = create_tvm_options(cpu_ver, config)