[PATCH] D50277: [WebAssembly] Support for atomic fences

[Heejin Ahn via Phabricator via llvm-commits]

aheejin created this revision.
aheejin added reviewers: dschuff, jfb.
Herald added subscribers: llvm-commits, sunfish, jgravelle-google, sbc100.

This adds support for translation of LLVM IR fence instruction.
Wasm does not have a fence instruction, but because all atomic
instructions in wasm are sequentially consistent, we translate a fence
to an idempotent atomic RMW instruction to a linear memory address.
While any address can work, here we use a value stored in
__stack_pointer wasm global because there's high chance that area is in
cache.


Repository:
  rL LLVM

https://reviews.llvm.org/D50277

Files:
  lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
  test/CodeGen/WebAssembly/atomic-fence.ll

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