[LLVMbugs] [Bug 19513] New: Avoid using the GOT when calling *_odr functions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19513

            Bug ID: 19513
           Summary: Avoid using the GOT when calling *_odr functions
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Given

define linkonce_odr void @bar() {
  ret void
}

define void @zed() {
  call void @bar()
  ret void
}

codegen will produce

    callq    bar at PLT

Since bar is *_odr, we know it is the same in every translation unit. CodeGen
could produce instead

.hidden bar_alias
bar_alias = bar
...

callq bar_alias

and avoid the PLT indirection.

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