speccpu: add SPEC class

src/speccpu/__init__.py

@@ -84,3 +84,36 @@ def find_build(build_dir: Path) -> Path:
         if entry.startswith("build"):
             return build_dir / entry
     raise RuntimeError(f"SPEC build directory not found at {build_dir}")
+
+
+class SPEC:
+    dir: Path
+
+    def __init__(self, dir: Path):
+        self.dir = dir
+
+    @property
+    def config_dir(self) -> Path:
+        return self.dir / "config"
+
+    def env(self):
+        return create_spec_env(self.dir)
+
+    def mkcmd_runcpu(
+        self,
+        config: str,
+        benchmarks: list[str],
+        setprocgroup: bool = True,
+        workload: str = "ref",
+        output_root: Path | None = None,
+    ):
+        return [
+            "runcpu",
+            *(["--setprocgroup"] if setprocgroup else []),
+            "-i",
+            workload,
+            "-c",
+            config,
+            *(["--outputdir", str(output_root)] if output_root else []),
+            *benchmarks,
+        ]