[LLVMbugs] [Bug 14590] New: X86: Need to implement efficient vector sign-extend load.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14590

             Bug #: 14590
           Summary: X86: Need to implement efficient vector sign-extend
                    load.
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nrotem at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


At the moment x86 scalarizes sign-extend loads. We need to convert this
sequence to Load, Unpack, SRL, SRA.

%X = load <4 x i16>* %ptr
%Y = sext <4 x i16> %X to <4 x i32>

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