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COMP: DiagonalMatrix: avoid clang's over-eager optimisation (fixes #2650)

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This commit is contained in:
Kutalmis Bercin
2022-12-06 09:54:11 +00:00
parent 3ab182b1ae
commit b50850de56
2 changed files with 11 additions and 15 deletions
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22
src/OpenFOAM/matrices/DiagonalMatrix/DiagonalMatrix.C
View File

@ -6,7 +6,7 @@
\\/ M anipulation |
-------------------------------------------------------------------------------
Copyright (C) 2011-2016 OpenFOAM Foundation
Copyright (C) 2019-2020 OpenCFD Ltd.
Copyright (C) 2019-2022 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -74,11 +74,9 @@ void Foam::DiagonalMatrix<Type>::invert()
{
for (Type& val : *this)
{
if (mag(val) < VSMALL)
{
val = Zero;
}
else
// If mag(val)<VSMALL, leave untouched
// forcing of val=Zero sometimes confuses compiler
if (mag(val) > VSMALL)
{
val = Type(1)/val;
}
@ -149,21 +147,19 @@ namespace Foam
// * * * * * * * * * * * * * * * Global Functions * * * * * * * * * * * * * //
//- Return the matrix inverse as a DiagonalMatrix if no elem is equal to zero
//- Return the matrix inverse as a DiagonalMatrix
template<class Type>
DiagonalMatrix<Type> inv(const DiagonalMatrix<Type>& mat)
{
DiagonalMatrix<Type> Ainv(mat.size());
// Construct with fall-back value conditional calculation
// of invert to avoid over-eager compiler optimisation
DiagonalMatrix<Type> Ainv(mat.size(), Zero);
Type* iter = Ainv.begin();
for (const Type& val : mat)
{
if (mag(val) < VSMALL)
{
*iter = Zero;
}
else
if (mag(val) > VSMALL)
{
*iter = Type(1)/val;
}

4
src/OpenFOAM/matrices/DiagonalMatrix/DiagonalMatrix.H
View File

@ -6,7 +6,7 @@
\\/ M anipulation |
-------------------------------------------------------------------------------
Copyright (C) 2011-2016 OpenFOAM Foundation
Copyright (C) 2019-2020 OpenCFD Ltd.
Copyright (C) 2019-2022 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -94,7 +94,7 @@ public:
// Member Functions
//- Return the matrix inverse into itself if no elem is equal to zero
//- Return the matrix inverse into itself
void invert();
//- Return a sort permutation labelList according to