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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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crates/environ/Cargo.toml
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@@ -16,7 +16,7 @@ anyhow = "1.0"
cranelift-codegen = { path = "../../cranelift/codegen", version = "0.68.0", features = ["enable-serde"] }
cranelift-entity = { path = "../../cranelift/entity", version = "0.68.0", features = ["enable-serde"] }
cranelift-wasm = { path = "../../cranelift/wasm", version = "0.68.0", features = ["enable-serde"] }
wasmparser = "0.66.0"
wasmparser = "0.67.0"
indexmap = { version = "1.0.2", features = ["serde-1"] }
thiserror = "1.0.4"
serde = { version = "1.0.94", features = ["derive"] }