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Add amrex::Math::rsqrt #4777

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Merged
merged 4 commits into from
Nov 13, 2025
Merged

Add amrex::Math::rsqrt #4777

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8ee8b7f
add amrex::Math::rsqrt
AlexanderSinn Nov 12, 2025
57fd94f
fix F
AlexanderSinn Nov 12, 2025
cf76b38
fix recursion
AlexanderSinn Nov 12, 2025
ee3e2ce
fix sycl
AlexanderSinn Nov 12, 2025
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28 changes: 28 additions & 0 deletions Src/Base/AMReX_Math.H
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Original file line number Diff line number Diff line change
Expand Up @@ -325,6 +325,34 @@ T comp_ellint_2 (T k)
return Kcomp*sum_val;
}

//! Return inverse square root of x
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
double rsqrt (double x)
{
double r;
#if defined(AMREX_USE_SYCL)
AMREX_IF_ON_DEVICE(( r = sycl::rsqrt(x); ))
#else
AMREX_IF_ON_DEVICE(( r = ::rsqrt(x); ))
#endif
AMREX_IF_ON_HOST(( r = 1. / std::sqrt(x); ))
return r;
}

//! Return inverse square root of x
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
float rsqrt (float x)
{
float r;
#if defined(AMREX_USE_SYCL)
AMREX_IF_ON_DEVICE(( r = sycl::rsqrt(x); ))
#else
AMREX_IF_ON_DEVICE(( r = ::rsqrtf(x); ))
#endif
AMREX_IF_ON_HOST(( r = 1.F / std::sqrt(x); ))
return r;
}

/***************************************************************************************************
* Copyright (c) 2017 - 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
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