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More ideas
Author: Agner Date: 2016-03-08 01:52
Hubert Lamontagne wrote:
would it make sense to adapt the code for different maximum SIMD vector length in the relocation pass? (ie when correcting all jump offsets when loading a DLL or doing address layout randomization to prevent hacking when loading executables)
The Gnu loader actually has this feature, called gnu indirect function. It can make entries in the procedure linkage table (PLT) point to different versions of a function depending on, e.g., which instruction set is supported. This feature is useful, but poorly documented. My idea is that you need only one version of the code and it will work optimally on all processors regardless of their maximum vector size. With current systems, you have to make a new version of the software every time a new processor with an improved instruction set comes on the market.
 
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