[PATCH] D65028: [WebAssembly] Compute and export TLS block alignment

[Guanzhong Chen via Phabricator via cfe-commits]

quantum created this revision.
quantum added reviewers: tlively, aheejin, sbc100, sunfish, alexcrichton.
Herald added subscribers: llvm-commits, cfe-commits, hiraditya, jgravelle-google, dschuff.
Herald added projects: clang, LLVM.

Add immutable WASM global `__tls_align` which stores the alignment
requirements of the TLS segment.

Add `__builtin_wasm_tls_align()` intrinsic to get this alignment in Clang.

The expected usage has now changed to:

  __wasm_init_tls(memalign(__builtin_wasm_tls_align(),
                           __builtin_wasm_tls_size()));


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D65028

Files:
  clang/include/clang/Basic/BuiltinsWebAssembly.def
  clang/lib/CodeGen/CGBuiltin.cpp
  clang/test/CodeGen/builtins-wasm.c
  lld/test/wasm/tls-align.ll
  lld/test/wasm/tls.ll
  lld/wasm/Driver.cpp
  lld/wasm/Symbols.cpp
  lld/wasm/Symbols.h
  lld/wasm/Writer.cpp
  llvm/include/llvm/IR/IntrinsicsWebAssembly.td
  llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp
  llvm/test/CodeGen/WebAssembly/tls-general-dynamic.ll

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