https://github.com/python/cpython/commit/c7a79bd2f4d3dd3bcaebd77c47f07d1feabe320a
commit: c7a79bd2f4d3dd3bcaebd77c47f07d1feabe320a
branch: main
author: Victor Stinner <[email protected]>
committer: vstinner <[email protected]>
date: 2026-10-01T16:19:26Z
summary:
gh-158567: Workaround GCC crash in PyFloat_Pack2() (#158568)
Avoid __builtin_bswap16() with _Float16 on s390x.
files:
M Objects/floatobject.c
diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index d3ae337236a693..5095da01e45dd2 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -1907,10 +1907,20 @@ PyFloat_Pack2(double x, char *data, int le)
}
if ((_PY_FLOAT_LITTLE_ENDIAN && !le) || (_PY_FLOAT_BIG_ENDIAN && le)) {
+#if defined(__s390x__) && defined(__GNUC__)
+ // gh-158567: Workaround GCC crash on s390x.
+ // Avoid __builtin_bswap16() with _Float16.
+ // https://bugzilla.redhat.com/show_bug.cgi?id=2544649
+ char buffer[2];
+ memcpy(buffer, &y, 2);
+ data[0] = buffer[1];
+ data[1] = buffer[0];
+#else
uint16_t word;
memcpy(&word, &y, 2);
word = _Py_bswap16(word);
memcpy(data, &word, 2);
+#endif
}
else {
memcpy(data, &y, sizeof(_Float16));
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