[LLVMbugs] [Bug 10903] New: [VECTOR-SELECT] needed dagcombine optimization for loading illegal types from memory

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10903

           Summary: [VECTOR-SELECT] needed dagcombine optimization for
                    loading illegal types from memory
           Product: new-bugs
           Version: 2.8
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nadav.rotem at intel.com
                CC: llvmbugs at cs.uiuc.edu


When enabling the promote-element type legalization we often load illegal types
such as <4 x i8> and legalize them into legal types such as <4 x i32>.
Currently we perform scalarization of the load operation and insert the
promoted elements one by one. This is inefficient and can be done by a single
load operation followed by a shuffle instruction.  I had implemented something
similar for the trunc-store operation.

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