Add wasmi Wasm simd proposal support skeleton (#1415)

* add wasm_simd option in Config

Only available if wasmi was compiled with `simd` enabled. Enabled by default.

* propagate wasmparser/simd crate feature

* add skeleton for SIMD translation

* apply clippy suggestion

* add skeleton for SIMD ops in executor

Author: Robbepop

crates/wasmi/Cargo.toml

@@ -55,7 +55,7 @@ prefer-btree-collections = [
     "wasmparser/prefer-btree-collections",
 ]
 wat = ["dep:wat", "std"]
-simd = ["wasmi_core/simd", "wasmi_ir/simd"]
+simd = ["wasmi_core/simd", "wasmi_ir/simd", "wasmparser/simd"]
 
 # Enables extra checks performed during Wasmi bytecode execution.
 #

crates/wasmi/src/engine/config.rs

@@ -184,6 +184,7 @@ impl Config {
         features.set(WasmFeatures::CUSTOM_PAGE_SIZES, false);
         features.set(WasmFeatures::MEMORY64, true);
         features.set(WasmFeatures::WIDE_ARITHMETIC, false);
+        features.set(WasmFeatures::SIMD, cfg!(feature = "simd"));
         features
     }
 
@@ -358,6 +359,17 @@ impl Config {
         self
     }
 
+    /// Enable or disable the [`simd`] Wasm proposal for the [`Config`].
+    ///
+    /// Enabled by default.
+    ///
+    /// [`simd`]: https://github.com/WebAssembly/simd
+    #[cfg(feature = "simd")]
+    pub fn wasm_simd(&mut self, enable: bool) -> &mut Self {
+        self.features.set(WasmFeatures::SIMD, enable);
+        self
+    }
+
     /// Enable or disable Wasm floating point (`f32` and `f64`) instructions and types.
     ///
     /// Enabled by default.

crates/wasmi/src/engine/executor/instrs.rs

@@ -14,6 +14,9 @@ mod utils;
 mod visit;
 mod visit_register;
 
+#[cfg(feature = "simd")]
+mod simd;
+
 #[cfg(test)]
 mod tests;
 

crates/wasmi/src/engine/translator/mod.rs

@@ -0,0 +1 @@
+mod visit;