[all-commits] [llvm/llvm-project] 7c6bfd: [WebAssembly] v128.load{8, 16, 32, 64}_lane instructions

[Thomas Lively via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 7c6bfd90ab2ddaa60de62878c8512db0645e8452
      https://github.com/llvm/llvm-project/commit/7c6bfd90ab2ddaa60de62878c8512db0645e8452
  Author: Thomas Lively <tlively at google.com>
  Date:   2020-10-15 (Thu, 15 Oct 2020)

  Changed paths:
    M clang/include/clang/Basic/BuiltinsWebAssembly.def
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/test/CodeGen/builtins-wasm.c
    M llvm/include/llvm/IR/IntrinsicsWebAssembly.td
    M llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
    M llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
    M llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
    A llvm/test/CodeGen/WebAssembly/simd-load-lane-offset.ll
    M llvm/test/MC/WebAssembly/simd-encodings.s

  Log Message:
  -----------
  [WebAssembly] v128.load{8,16,32,64}_lane instructions

Prototype the newly proposed load_lane instructions, as specified in
https://github.com/WebAssembly/simd/pull/350. Since these instructions are not
available to origin trial users on Chrome stable, make them opt-in by only
selecting them from intrinsics rather than normal ISel patterns. Since we only
need rough prototypes to measure performance right now, this commit does not
implement all the load and store patterns that would be necessary to make full
use of the offset immediate. However, the full suite of offset tests is included
to make it easy to track improvements in the future.

Since these are the first instructions to have a memarg immediate as well as an
additional immediate, the disassembler needed some additional hacks to be able
to parse them correctly. Making that code more principled is left as future
work.

Differential Revision: https://reviews.llvm.org/D89366