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Add branch free capability #453

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Add branch free capability #453

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361ca74
remove use of subscript operator
kdt3rd Nov 14, 2024
5758c95
Add branchless access in an indexed way
kdt3rd Nov 14, 2024
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13 changes: 10 additions & 3 deletions src/Imath/ImathMatrixAlgo.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1385,10 +1385,17 @@ template <class T>
bool
checkForZeroScaleInRow (const T& scl, const Vec2<T>& row, bool exc /* = true */)
{
for (int i = 0; i < 2; i++)
if (abs (scl) < T(1))
{
if ((abs (scl) < 1 &&
abs (row[i]) >= std::numeric_limits<T>::max () * abs (scl)))
if (abs (row.x) >= std::numeric_limits<T>::max () * abs (scl))
{
if (exc)
throw std::domain_error (
"Cannot remove zero scaling from matrix.");
else
return false;
}
if (abs (row.y) >= std::numeric_limits<T>::max () * abs (scl))
{
if (exc)
throw std::domain_error (
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