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Bug 385

Summary: Preserve preallocated memory of the destination of a sparse * sparse product
Product: Eigen Reporter: Gael Guennebaud <gael.guennebaud>
Component: SparseAssignee: Nobody <eigen.nobody>
Status: CONFIRMED ---    
Severity: Optimization CC: chtz
Priority: Normal    
Version: 3.4 (development)   
Hardware: All   
OS: All   

Description Gael Guennebaud 2011-12-03 17:56:32 UTC
From bug 282:

"It might be possible to 'recompute' a Sparse*Sparse product where the
structure did not change thus no overhead for reallocation would arise."

However, this is not trivial because currently we always evaluate into a temporary and then do a shallow copy (swap) to the destination matrix.
Comment 1 Gael Guennebaud 2011-12-03 17:57:12 UTC
I meant bug 284.
Comment 2 Nobody 2019-12-04 11:17:53 UTC
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