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Add SIMD-accelerated density update for DensityEpsi! #168

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Add SIMD-accelerated density update for DensityEpsi! #168

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2 changes: 2 additions & 0 deletions Project.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ LoggingExtras = "e6f89c97-d47a-5376-807f-9c37f3926c36"
Parameters = "d96e819e-fc66-5662-9728-84c9c7592b0a"
Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
ProgressMeter = "92933f4c-e287-5a05-a399-4b506db050ca"
SIMD = "fdea26ae-647d-5447-a871-4b548cad5224"
StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
StructArrays = "09ab397b-f2b6-538f-b94a-2f83cf4a842a"
TimerOutputs = "a759f4b9-e2f1-59dc-863e-4aeb61b1ea8f"
Expand All @@ -35,6 +36,7 @@ LoggingExtras = "1.1.0"
Parameters = "0.12.3"
Printf = "1.10"
ProgressMeter = "1.11.0"
SIMD = "3.5.0"
StaticArrays = "1.9.15"
StructArrays = "0.7.1"
TimerOutputs = "0.5.29"
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29 changes: 26 additions & 3 deletions src/SimulationEquations.jl
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Expand Up @@ -5,6 +5,7 @@ export EquationOfState, EquationOfStateGamma7, Pressure!, DensityEpsi!, LimitDen
using StaticArrays
using Parameters
using FastPow
using SIMD

@inline function EquationOfStateGamma7(ρ,c₀,ρ₀)
return @fastpow ((c₀^2*ρ₀)/7) * ((ρ/ρ₀)^7 - 1)
Expand All @@ -26,10 +27,32 @@ end
# This is to handle the special factor multiplied on density in the time stepping procedure, when
# using symplectic time stepping
@inline function DensityEpsi!(Density, dρdtIₙ⁺,ρₙ⁺,Δt)
@inbounds for i in eachindex(Density)
epsi = - (dρdtIₙ⁺[i] / ρₙ⁺[i]) * Δt
Density[i] *= (2 - epsi) / (2 + epsi)
_density_epsi_simd!(Density, dρdtIₙ⁺, ρₙ⁺, Δt)
return Density
end

@inline function _density_epsi_simd!(Density, dρdtIₙ⁺, ρₙ⁺, Δt)
T = eltype(Density)
lanes = T === Float32 ? 8 : 4
W = Vec{lanes, T}
n = length(Density)
i = 1

@inbounds while i <= n - lanes + 1
density_vec = vload(W, Density, i)
dρdt_vec = vload(W, dρdtIₙ⁺, i)
ρn_vec = vload(W, ρₙ⁺, i)
epsi_vec = -(dρdt_vec / ρn_vec) * T(Δt)
ratio_vec = (T(2) - epsi_vec) / (T(2) + epsi_vec)
vstore!(Density, i, density_vec * ratio_vec)
i += lanes
end

@inbounds for j in i:n
epsi = - (dρdtIₙ⁺[j] / ρₙ⁺[j]) * Δt
Density[j] *= (2 - epsi) / (2 + epsi)
end
return Density
end

# This version of the function using !Bool(MotionLimiter) instead of BoundaryBool
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