Remove @muladd and dependency

Author: efaulhaber

Project.toml

@@ -1,7 +1,7 @@
 name = "TrixiParticles"
 uuid = "66699cd8-9c01-4e9d-a059-b96c86d16b3a"
-authors = ["erik.faulhaber <44124897+efaulhaber@users.noreply.github.com>"]
 version = "0.4.5-dev"
+authors = ["erik.faulhaber <44124897+efaulhaber@users.noreply.github.com>"]
 
 [deps]
 Accessors = "7d9f7c33-5ae7-4f3b-8dc6-eff91059b697"
@@ -18,7 +18,6 @@ GPUArraysCore = "46192b85-c4d5-4398-a991-12ede77f4527"
 JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
 KernelAbstractions = "63c18a36-062a-441e-b654-da1e3ab1ce7c"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
-MuladdMacro = "46d2c3a1-f734-5fdb-9937-b9b9aeba4221"
 PointNeighbors = "1c4d5385-0a27-49de-8e2c-43b175c8985c"
 Polyester = "f517fe37-dbe3-4b94-8317-1923a5111588"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
@@ -54,7 +53,6 @@ ForwardDiff = "1"
 GPUArraysCore = "0.2"
 JSON = "1"
 KernelAbstractions = "0.9"
-MuladdMacro = "0.2"
 OrdinaryDiffEq = "6.91"
 OrdinaryDiffEqCore = "2, 3"
 PointNeighbors = "0.6.5"

src/TrixiParticles.jl

@@ -17,7 +17,6 @@ using GPUArraysCore: AbstractGPUArray
 using JSON: JSON
 using KernelAbstractions: KernelAbstractions, @kernel, @index
 using LinearAlgebra: norm, normalize, cross, dot, I, tr, inv, pinv, det
-using MuladdMacro: @muladd
 using Polyester: Polyester, @batch
 using Printf: @printf, @sprintf
 using ReadVTK: ReadVTK

src/general/smoothing_kernels.jl

@@ -194,9 +194,7 @@ struct SchoenbergCubicSplineKernel{NDIMS} <: AbstractSmoothingKernel{NDIMS} end
     h_inv = 1 / h
     q = r * h_inv
 
-    # We do not use `+=` or `-=` since these are not recognized by MuladdMacro.jl.
-    result = 1 * (2 - q)^3 / 4
-    @muladd result = result - (q < 1) * (1 - q)^3
+    result = 1 * (2 - q)^3 / 4 - (q < 1) * (1 - q)^3
 
     return normalization_factor(kernel, h_inv) * result
 end