[LLVMbugs] [Bug 2782] New: Aliases should be forwarded if possible

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2782

           Summary: Aliases should be forwarded if possible
           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: asl at math.spbu.ru, llvmbugs at cs.uiuc.edu


The following testcase

@A = alias void ()* @F          ; <void ()*> [#uses=1]
declare void @F()
define void @C() {
        call void @A( )
        ret void
}

could (and should) be turned into

@A = alias void ()* @F          ; <void ()*> [#uses=1]
declare void @F()
define void @C() {
        call void @F( )
        ret void
}

where the call is now a direct call to F.
(This is only correct if the alias does not
have weak linkage or similar).  Turning
indirect calls into direct calls opens up
new optimization opportunities.


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