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BUG: Any dtype should call square on arr ** 2 #29392

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Merged
merged 5 commits into from
Jul 22, 2025
Merged

BUG: Any dtype should call square on arr ** 2 #29392

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d8eeb76
BUG: update fast_scalar_power to handle special-case squaring for any…
MaanasArora Jul 16, 2025
097b04a
BUG: fix missing declaration
MaanasArora Jul 16, 2025
79a91a1
TST: add test to ensure `arr**2` calls square for structured dtypes
MaanasArora Jul 16, 2025
e014ffe
STY: remove whitespace
MaanasArora Jul 16, 2025
ddaef11
BUG: replace new variable `is_square` with direct op comparison in `f…
MaanasArora Jul 17, 2025
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BUG: replace new variable is_square with direct op comparison in `f… 
…ast_scalar_power` function
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@MaanasArora
MaanasArora committed Jul 17, 2025
commit ddaef11f219990372f1c10bca2d3d3f0bb57a2e9
4 changes: 1 addition & 3 deletions numpy/_core/src/multiarray/number.c
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Expand Up @@ -332,7 +332,6 @@ static int
fast_scalar_power(PyObject *o1, PyObject *o2, int inplace, PyObject **result)
{
PyObject *fastop = NULL;
int is_square = 0;

if (PyLong_CheckExact(o2)) {
int overflow = 0;
Expand All @@ -346,7 +345,6 @@ fast_scalar_power(PyObject *o1, PyObject *o2, int inplace, PyObject **result)
}
else if (exp == 2) {
fastop = n_ops.square;
is_square = 1;
}
else {
return 1;
Expand All @@ -369,7 +367,7 @@ fast_scalar_power(PyObject *o1, PyObject *o2, int inplace, PyObject **result)
if (PyArray_ISOBJECT(a1)) {
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Thanks, yeah this seems right/safe to me. I am not sure I see why **2 confuses a custom __array_ufunc__, but I don't think this is an issue (and probably restores old behavior). (If we had a bigger reason to keep it as is, I would be tempted to ask downstream to fix it there.)

Curious, does **0.5 always end up with sqrt()?

(Maybe the nicer solution for at least **2 would actually be to make the object square implementation use **2 internally then this special case wouldn't even be needed. But no priority so if, let's do that as a follow-up.)

return 1;
}
if (!is_square && !PyArray_ISFLOAT(a1) && !PyArray_ISCOMPLEX(a1)) {
if (fastop != n_ops.square && !PyArray_ISFLOAT(a1) && !PyArray_ISCOMPLEX(a1)) {
// we special-case squaring for any array type
// gh-29388
return 1;
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