3f46e5453d
This patch utilizes the -maix-small-local-exec-tls option added in D155544 to produce a faster access sequence for the local-exec TLS model, where loading from the TOC can be avoided. The patch either produces an addi/la with a displacement off of r13 (the thread pointer) when the address is calculated, or it produces an addi/la followed by a load/store when the address is calculated and used for further accesses. This patch also optimizes this sequence a bit more where we can remove the addi/la when the load/store offset is 0. A follow up patch will be posted to account for when the load/store offset is non-zero, and currently in these situations we keep the addi/la that precedes the load/store. Furthermore, this access sequence is only performed for TLS variables that are less than ~32KB in size. Differential Revision: https://reviews.llvm.org/D155600
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