DRC: math: Replace exponential function for performance #1482

	---

	name: Build test all components

	# 'workflow_dispatch' allows running this workflow manually from the
	# 'Actions' tab

	# yamllint disable-line rule:truthy
	on: [pull_request, workflow_dispatch]

	jobs:

	stub-build:
	runs-on: ubuntu-22.04
	strategy:
	matrix:
	# Keep these names short due to questionable Github UI choices
	IPC: [ipc3, ipc4]

	steps:
	- name: add i386 arch
	run: \|
	sudo dpkg --add-architecture i386
	sudo apt-get update

	- name: apt-get install i386 packages
	run: \|

	# We don't know why Github requires us to explicit all these i386
	# dependencies. On a vanilla Ubuntu 22.04 the last apt-get is
	# enough.
	# Also, it does not seem possible to download Github images for
	# local testing which means trial and error for this requires a
	# force-push every time: excruciatingly slow!
	sudo apt-get -y install \
	libgcc-s1:i386 libc6-dev:i386 libstdc++6:i386 \
	libgomp1:i386 libitm1:i386 libatomic1:i386 \
	libasan8:i386 libubsan1:i386 libquadmath0:i386 \

	sudo apt-get -y install \
	libc6-dev-i386 libstdc++-12-dev:i386

	- name: apt-get install build tools
	run:
	sudo apt-get -y install
	clang llvm ninja-build device-tree-compiler python3-pyelftools

	- uses: actions/checkout@v3
	with:
	path: ./workspace/sof

	- name: west update
	run: \|
	cd workspace/sof
	pip3 install west
	west init -l
	west update --narrow --fetch-opt=--filter=tree:0

	- name: build
	run: \|
	cd workspace
	clang --verbose
	set -x
	sof/scripts/fuzz.sh -b -- -DOVERLAY_CONFIG=stub_build_all_${{ matrix.IPC }}.conf

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