[LLVMbugs] [Bug 11158] New: ALL backends need to implement efficient trunc-store sequences

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11158

           Summary: ALL backends need to implement efficient trunc-store
                    sequences
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nadav.rotem at intel.com
                CC: llvmbugs at cs.uiuc.edu


The type-legalizer often generates trunc store or anyext loads. The
type-legalizer attempts to promote elements in order to fit the vector type
into a physical register. This is a good idea because the instruction set for
non-common types tends to be sparse. However, the data is saved in memory in
its 'legal' form and trunc-ing or anyext-ing is needed.

Look at the x86backend (combine dag for load/store) for an example.

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