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Bug 385 - Preserve preallocated memory of the destination of a sparse * sparse product
Summary: Preserve preallocated memory of the destination of a sparse * sparse product
Status: CONFIRMED
Alias: None
Product: Eigen
Classification: Unclassified
Component: Sparse (show other bugs)
Version: 3.4 (development)
Hardware: All All
: Normal Optimization
Assignee: Nobody
URL:
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Keywords:
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Blocks:
 
Reported: 2011-12-03 17:56 UTC by Gael Guennebaud
Modified: 2019-12-04 11:17 UTC (History)
1 user (show)


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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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