Adding metadata

3 files changed, 133 insertions, 3 deletions

diff --git a/dev-python/gfloat/files/gfloat-0.5.2-signed-zero-overflow.patch b/dev-python/gfloat/files/gfloat-0.5.2-signed-zero-overflow.patch
new file mode 100644
index 000000000000..fd011671ecfe
--- /dev/null
+++ b/dev-python/gfloat/files/gfloat-0.5.2-signed-zero-overflow.patch
@@ -0,0 +1,51 @@
+From 575ceff2babe3e54795ec4ce441ec8e981462f9b Mon Sep 17 00:00:00 2001
+From: Andrew Fitzgibbon <awf@fitzgibbon.ie>
+Date: Fri, 18 Sep 2026 15:58:51 +0100
+Subject: [PATCH] Fix binary64 ndarray encoding overflow for signed zero
+
+---
+ src/gfloat/encode_ndarray.py |  5 ++++-
+ test/test_encode.py          | 17 +++++++++++++++++
+ 2 files changed, 21 insertions(+), 1 deletion(-)
+
+diff --git a/src/gfloat/encode_ndarray.py b/src/gfloat/encode_ndarray.py
+index af883e4..3d5981c 100644
+--- a/src/gfloat/encode_ndarray.py
++++ b/src/gfloat/encode_ndarray.py
+@@ -51,7 +51,10 @@ def encode_ndarray(fi: FormatInfo, v: npt.NDArray) -> npt.NDArray:
+ 
+     if fi.has_zero:
+         if fi.has_nz:
+-            code[v == 0] = np.where(sign[v == 0], fi.code_of_negzero, fi.code_of_zero)
++            # binary64's negative-zero code exceeds the signed int64 range.
++            code[v == 0] = np.where(
++                sign[v == 0], np.uint64(fi.code_of_negzero), np.uint64(fi.code_of_zero)
++            )
+         else:
+             code[v == 0] = fi.code_of_zero
+ 
+diff --git a/test/test_encode.py b/test/test_encode.py
+index efdaa1f..8ab344f 100644
+--- a/test/test_encode.py
++++ b/test/test_encode.py
+@@ -62,3 +62,20 @@ def test_encode_edges(fi: FormatInfo, enc: Callable) -> None:
+             if fi.domain == Domain.Extended
+             else fi.code_of_nan if fi.num_nans > 0 else fi.code_of_min
+         )
++
++
++@pytest.mark.parametrize(
++    "values",
++    [
++        [0.0, -0.0],
++        [[-0.0, 0.0], [1.0, -1.0]],
++        [1.0, -1.0],  # The zero selection is empty, as in issue #63.
++        [],
++    ],
++)
++def test_encode_binary64_signed_zero(values: npt.ArrayLike) -> None:
++    v = np.array(values, dtype=np.float64)
++    codes = encode_ndarray(format_info_binary64, v)
++    assert codes.dtype == np.dtype(np.uint64)
++    assert codes.shape == v.shape
++    np.testing.assert_array_equal(codes, v.view(np.uint64))
diff --git a/dev-python/gfloat/gfloat-0.5.2-r1.ebuild b/dev-python/gfloat/gfloat-0.5.2-r1.ebuild
index b545ecf5f33e..bf081ec3b862 100644
--- a/dev-python/gfloat/gfloat-0.5.2-r1.ebuild
+++ b/dev-python/gfloat/gfloat-0.5.2-r1.ebuild
@@ -26,16 +26,16 @@ RDEPEND="
 "
 BDEPEND="
 	test? (
+		dev-python/jinja2[${PYTHON_USEDEP}]
 		dev-python/matplotlib[${PYTHON_USEDEP}]
 		dev-python/ml-dtypes[${PYTHON_USEDEP}]
 		dev-python/tabulate[${PYTHON_USEDEP}]
 		test-rust? (
 			dev-python/nbval[${PYTHON_USEDEP}]
 		)
-		!arm? (
-			dev-python/jinja2[${PYTHON_USEDEP}]
+		!arm? ( !x86? (
 			dev-python/pandas[${PYTHON_USEDEP}]
-		)
+		) )
 	)
 "
 
diff --git a/dev-python/gfloat/gfloat-0.5.2-r2.ebuild b/dev-python/gfloat/gfloat-0.5.2-r2.ebuild
new file mode 100644
index 000000000000..52a0a20c2d05
--- /dev/null
+++ b/dev-python/gfloat/gfloat-0.5.2-r2.ebuild
@@ -0,0 +1,79 @@
+# Copyright 2024-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DISTUTILS_USE_PEP517=setuptools
+PYTHON_COMPAT=( python3_{13..14} )
+
+inherit distutils-r1 pypi
+
+DESCRIPTION="Generic floating-point types in Python"
+HOMEPAGE="
+	https://github.com/graphcore-research/gfloat/
+	https://pypi.org/project/gfloat/
+"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64 ~arm ~arm64 ~riscv ~x86"
+IUSE="test-rust"
+
+RDEPEND="
+	dev-python/array-api-compat[${PYTHON_USEDEP}]
+	dev-python/more-itertools[${PYTHON_USEDEP}]
+	dev-python/numpy[${PYTHON_USEDEP}]
+"
+BDEPEND="
+	test? (
+		dev-python/jinja2[${PYTHON_USEDEP}]
+		dev-python/matplotlib[${PYTHON_USEDEP}]
+		dev-python/ml-dtypes[${PYTHON_USEDEP}]
+		dev-python/tabulate[${PYTHON_USEDEP}]
+		test-rust? (
+			dev-python/nbval[${PYTHON_USEDEP}]
+		)
+		!arm? ( !x86? (
+			dev-python/pandas[${PYTHON_USEDEP}]
+		) )
+	)
+"
+
+EPYTEST_PLUGINS=()
+distutils_enable_tests pytest
+
+PATCHES=(
+	# https://github.com/graphcore-research/gfloat/pull/60
+	"${FILESDIR}/${P}-32bit.patch"
+	# https://github.com/graphcore-research/gfloat/pull/64
+	"${FILESDIR}/${P}-signed-zero-overflow.patch"
+)
+
+python_test() {
+	local EPYTEST_IGNORE=(
+		# requires array-api-strict (probably not very valuable downstream)
+		test/test_array_api.py
+		# require jax
+		docs/source/03-value-tables.ipynb
+		docs/source/04-benchmark.ipynb
+		test/test_jax.py
+		# requires mx (possibly git version), torch
+		test/test_microxcaling.py
+		# requires torch
+		test/test_torch.py
+	)
+
+	if ! has_version "dev-python/jinja2[${PYTHON_USEDEP}]" ||
+		! has_version "dev-python/pandas[${PYTHON_USEDEP}]"
+	then
+		EPYTEST_IGNORE+=(
+			docs/source
+		)
+	fi
+
+	if has_version "dev-python/nbval[${PYTHON_USEDEP}]"; then
+		epytest -p nbval
+	else
+		epytest -o addopts=
+	fi
+}