Joost Yervante Damad wrote:
Reading up on this, I don't think using -fPIC on amd64 has a performance penalty since it has the %rip register. Also it appears that gcc by default uses indirect addressing via %rip in the generated asm.
I did some benchmarks when switching the ocamlopt AMD64 code generator to generate PIC code by default (in order to support Dynlink on native code): the slowdown was indeed very small (in the order of a few percent for micro benchmarks). Modern processors seem very good for optimizing indirect calls.
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