[llvm-commits] [PATCH] Implement local-dynamic TLS model for x86 (PR3985)

[Hans Wennborg]

Taking another stab at this.

The attached patch implements support for the local-dynamic TLS model on x86.

The lowering code will generate calls to get the address for the TLS
block for each variable access. Later, a MachineFunctionPass is used
to remove all such calls except one, achieving the goal of at most one
call to __get_tls_addr per function.

Again, I'm new to codegen, so any comments and suggestions are much
appreciated. Please review.

Thanks,
Hans
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