[LLVMbugs] [Bug 8616] New: gep+load/store is optimized differently that insertvalue+store and load+extractvalue.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8616

           Summary: gep+load/store is optimized differently that
                    insertvalue+store and load+extractvalue.
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: tom.prince at ualberta.net
                CC: llvmbugs at cs.uiuc.edu


I have attached to ll files, that differ simply in the use of GEP vs
insert/extractvalue.

For gep.ll, opt -O3 optimizes most of the code away, and running opt -O3 gets
rid of a single extra store.

For ev.ll, opt -O3 optimizes much less, but then running opt -O3 on the output
again gets rid of all the alloca.

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