[llvm-dev] [RFC] lld: Dropping TLS relaxations in favor of TLSDESC (original) (raw)

Joerg Sonnenberger via llvm-dev llvm-dev at lists.llvm.org
Thu Nov 9 05:15:16 PST 2017

On Wed, Nov 08, 2017 at 12:46:20PM -0800, Rui Ueyama via llvm-dev wrote:

So, looks like there are programs in where TLS relaxation actually matters. It is interesting that both examples mentioned in this threads are graphics-related (OpenGL and games). I wonder if it is a coincidence or it is a common practice to use thread-local variables heavily in graphics. I haven't wrote any games before, so it is likely that I don't know some basics in that area.

In the OpenGL case it is primary an effect of retrofitting thread-safety into existing APIs. Just like some systems retrofit many of the non-reentrant libc functions by using thread-local storage for the buffers.

Joerg

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