# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

PYTHON_COMPAT=( python3_1{1,2} )
ROCM_VERSION=5.1.3
DISTUTILS_EXT=1
DISTUTILS_USE_PEP517=setuptools

inherit distutils-r1 prefix pypi rocm cuda

DESCRIPTION="CuPy: A NumPy-compatible array library accelerated by CUDA"
SRC_URI="$(pypi_sdist_url "${PN^}" "${PV}")"
HOMEPAGE="https://cupy.dev/"

IUSE="rocm +cuda cudnn"
REQUIRED_USE="
	^^ ( cuda rocm )
	cudnn? ( cuda )
	rocm? ( ${ROCM_REQUIRED_USE} )
	"
LICENSE="MIT"
SLOT="0"
KEYWORDS="~amd64"
DEPEND="
	>=dev-python/cython-0.29.22[${PYTHON_USEDEP}]
	>=dev-python/numpy-1.18.0[${PYTHON_USEDEP}]
	cuda? ( dev-util/nvidia-cuda-toolkit[profiler] )
	cudnn? ( dev-libs/cudnn )
	rocm? ( >=dev-util/hip-${ROCM_VERSION}
		>=dev-util/roctracer-${ROCM_VERSION}
		>=sci-libs/hipBLAS-${ROCM_VERSION}:=[${ROCM_USEDEP}]
		>=sci-libs/hipCUB-${ROCM_VERSION}:=[${ROCM_USEDEP}]
		>=sci-libs/hipFFT-${ROCM_VERSION}:=[${ROCM_USEDEP}]
		>=sci-libs/hipRAND-${ROCM_VERSION}:=[${ROCM_USEDEP}]
		>=sci-libs/rocThrust-${ROCM_VERSION}:=[${ROCM_USEDEP}]
		>=sci-libs/hipSPARSE-${ROCM_VERSION}:=[${ROCM_USEDEP}] )"
RDEPEND=">=dev-python/fastrlock-0.8.1
	${DEPEND}"

distutils_enable_tests pytest

PATCHES=(
	"${FILESDIR}"/${PN}-11.6-add_dir.patch
	"${FILESDIR}"/${PN}-13.2-cython3.patch
)

src_prepare ()
{
	default
	eprefixify cupy/cuda/compiler.py
	use cuda && cuda_src_prepare
}

src_compile() {
	if use rocm; then
		addpredict /dev/kfd
		addpredict /dev/dri/
		export CUPY_INSTALL_USE_HIP=1
		export ROCM_HOME="${EPREFIX}/usr"
		local AMDGPU_FLAGS=$(get_amdgpu_flags)
		export HCC_AMDGPU_TARGET=${AMDGPU_FLAGS//;/,}
	elif use cuda; then
		# specify instructions to emit
		local target
		for target in ${NVPTX_TARGETS}; do
			CUPY_NVCC_GENERATE_CODE+="arch=${target/sm/compute},code=${target};"
		done
		export CUPY_NVCC_GENERATE_CODE
		export NVCC="nvcc ${NVCCFLAGS}"

		NDEV="/dev/nvidia-uvm-tools"
		[[ -e ${NDEV} ]] || die \
			"${NDEV} does not exist. Try `nvidia-modprobe -u -c 0` to create it."
		for device in /dev/nvidia*; do
			addpredict "${device}"
		done
	fi
	distutils-r1_src_compile
}