[LLVMbugs] [Bug 3438] New: SROA could peel one level off struct, but doesn't

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3438

           Summary: SROA could peel one level off struct, but doesn't
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu


In the following testcase, the alloca could be
turned into an alloca of type %bounds, and one
GEP index dropped.

        %wrapper = type { %bounds }
        %bounds = type { i32, i32 }

define void @f() {
entry:
        %v = alloca %wrapper, align 8           ; <%wrapper*> [#uses=5]
        %p = getelementptr %wrapper* %v, i32 0, i32 0           ; <%bounds*>
[#uses=1]
        call void @use(%bounds* noalias sret %p)
        ret void
}

declare void @use(%bounds* noalias sret)


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