[LLVMbugs] [Bug 17745] New: SLP Vectorizer: Partial Tree Vectorization

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17745

            Bug ID: 17745
           Summary: SLP Vectorizer: Partial Tree Vectorization
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: nrotem at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The first phase of vectorization is construction an SLP tree.  Some of the
branches of the tree may be profitable while other branches are not. At the
moment we vectorize all or nothing. We need to add a pruning phase as part of
the cost phase.

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