[llvm-bugs] [Bug 39049] Avoid relocations in position independent code by storing offset of program counter

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jun 25 23:01:42 PDT 2019


Fangrui Song <i at maskray.me> changed:

           What    |Removed                     |Added
         Resolution|---                         |WORKSFORME
                 CC|                            |i at maskray.me
             Status|NEW                         |RESOLVED

--- Comment #2 from Fangrui Song <i at maskray.me> ---
> and a simple addition/subtraction with a constant

You may mean relocations relative to section symbols. They are represented as
something like .text + 0x20 . I think these are already leveraged by
compilers.. (llvm-mc is better at using local symbols than GNU as) 

> a constant could be used instead of a relocation table that slows down program load.

I think you meant dynamic relocation types. This mechanism is available in
linkers. Dynamic relocation types are only produced when necessary..

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