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Support wasm select instruction with V128-typed operands on AArch64.

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* this requires upgrading to wasmparser 0.67.0.

* There are no CLIF side changes because the CLIF `select` instruction is
  polymorphic enough.

* on aarch64, there is unfortunately no conditional-move (csel) instruction on
  vectors.  This patch adds a synthetic instruction `VecCSel` which *does*
  behave like that.  At emit time, this is emitted as an if-then-else diamond
  (4 insns).

* aarch64 implementation is otherwise straightforwards.
This commit is contained in:
Julian Seward
2020-11-11 17:09:57 +01:00
committed by julian-seward1
parent 9ced345aed
commit 41e87a2f99
15 changed files with 122 additions and 18 deletions
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Cargo.toml
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@@ -42,7 +42,7 @@ libc = "0.2.60"
log = "0.4.8"
rayon = "1.2.1"
humantime = "2.0.0"
wasmparser = "0.66"
wasmparser = "0.67"
[dev-dependencies]
env_logger = "0.8.1"