expand normalize_isa aliases and update KNOWN_ARCHITECTURES

Author: ryukofc

src/python_discovery/_py_info.py

@@ -770,12 +770,13 @@ def _possible_base(self) -> Generator[str, None, None]:
 
 KNOWN_ARCHITECTURES: frozenset[str] = frozenset({
     "arm64",
-    "i686",
     "loongarch64",
+    "ppc",
     "ppc64",
     "ppc64le",
     "riscv64",
     "s390x",
+    "sparc64",
     "x86",
     "x86_64",
 })
@@ -794,7 +795,18 @@ def normalize_isa(isa: str) -> str:
     Unrecognized values are lowercased and returned as-is.
     """
     low = isa.lower()
-    return {"amd64": "x86_64", "aarch64": "arm64", "i386": "x86", "i586": "x86"}.get(low, low)
+    return {
+        "amd64": "x86_64",
+        "aarch64": "arm64",
+        "i386": "x86",
+        "i486": "x86",
+        "i586": "x86",
+        "i686": "x86",
+        "powerpc": "ppc",
+        "powerpc64": "ppc64",
+        "powerpc64le": "ppc64le",
+        "sparcv9": "sparc64",
+    }.get(low, low)
 
 
 def _main() -> None:  # pragma: no cover

tests/test_py_spec.py

@@ -217,9 +217,19 @@ def test_spec_satisfies_machine(left: str, right: str, expected: bool) -> None:
         pytest.param("x86_64", "x86_64", id="x86_64"),
         pytest.param("arm64", "arm64", id="arm64"),
         pytest.param("x86", "x86", id="x86"),
+        pytest.param("i386", "x86", id="i386"),
+        pytest.param("i486", "x86", id="i486"),
+        pytest.param("i586", "x86", id="i586"),
+        pytest.param("i686", "x86", id="i686"),
         pytest.param("ppc64le", "ppc64le", id="ppc64le"),
+        pytest.param("powerpc", "ppc", id="powerpc"),
+        pytest.param("powerpc64", "ppc64", id="powerpc64"),
+        pytest.param("powerpc64le", "ppc64le", id="powerpc64le"),
         pytest.param("riscv64", "riscv64", id="riscv64"),
         pytest.param("s390x", "s390x", id="s390x"),
+        pytest.param("sparcv9", "sparc64", id="sparcv9"),
+        pytest.param("sparc64", "sparc64", id="sparc64"),
+        pytest.param("alpha", "alpha", id="alpha-passthrough"),
     ],
 )
 def test_normalize_isa(isa: str, normalized: str) -> None: