Add v128.load32_zero and v128.load64_zero SIMD instructions (#119)

* Add v128.load32_zero and v128.load64_zero SIMD instructions

* Update formatting

Author: lars-t-hansen

crates/wasmparser/src/binary_reader.rs

@@ -1728,6 +1728,12 @@ impl<'a> BinaryReader<'a> {
             0xf9 => Operator::I32x4TruncSatF32x4U,
             0xfa => Operator::F32x4ConvertI32x4S,
             0xfb => Operator::F32x4ConvertI32x4U,
+            0xfc => Operator::V128Load32Zero {
+                memarg: self.read_memarg_of_align(2)?,
+            },
+            0xfd => Operator::V128Load64Zero {
+                memarg: self.read_memarg_of_align(3)?,
+            },
             _ => {
                 return Err(BinaryReaderError::new(
                     format!("Unknown 0xfd subopcode: 0x{:x}", code),

crates/wasmparser/src/operators_validator.rs

@@ -1593,13 +1593,14 @@ impl OperatorValidator {
                 self.pop_operand(Some(ty))?;
                 self.push_operand(Type::V128)?;
             }
-            Operator::V128Load32Splat { memarg } => {
+            Operator::V128Load32Splat { memarg } | Operator::V128Load32Zero { memarg } => {
                 self.check_simd_enabled()?;
                 let ty = self.check_memarg(memarg, 2, resources)?;
                 self.pop_operand(Some(ty))?;
                 self.push_operand(Type::V128)?;
             }
             Operator::V128Load64Splat { memarg }
+            | Operator::V128Load64Zero { memarg }
             | Operator::V128Load8x8S { memarg }
             | Operator::V128Load8x8U { memarg }
             | Operator::V128Load16x4S { memarg }

crates/wasmparser/src/primitives.rs

@@ -781,7 +781,9 @@ pub enum Operator<'a> {
     V128Load8Splat { memarg: MemoryImmediate },
     V128Load16Splat { memarg: MemoryImmediate },
     V128Load32Splat { memarg: MemoryImmediate },
+    V128Load32Zero { memarg: MemoryImmediate },
     V128Load64Splat { memarg: MemoryImmediate },
+    V128Load64Zero { memarg: MemoryImmediate },
     I8x16NarrowI16x8S,
     I8x16NarrowI16x8U,
     I16x8NarrowI32x4S,

crates/wasmprinter/src/lib.rs

@@ -1271,6 +1271,9 @@ impl Printer {
             V128Load32Splat { memarg } => self.mem_instr("v128.load32_splat", memarg, 4)?,
             V128Load64Splat { memarg } => self.mem_instr("v128.load64_splat", memarg, 8)?,
 
+            V128Load32Zero { memarg } => self.mem_instr("v128.load32_zero", memarg, 4)?,
+            V128Load64Zero { memarg } => self.mem_instr("v128.load64_zero", memarg, 8)?,
+
             I8x16NarrowI16x8S => self.result.push_str("i8x16.narrow_i16x8_s"),
             I8x16NarrowI16x8U => self.result.push_str("i8x16.narrow_i16x8_u"),
             I16x8NarrowI32x4S => self.result.push_str("i16x8.narrow_i32x4_s"),

crates/wast/src/ast/expr.rs

@@ -993,6 +993,9 @@ instructions! {
         F32x4ConvertI32x4S : [0xfd, 0xfa] : "f32x4.convert_i32x4_s",
         F32x4ConvertI32x4U : [0xfd, 0xfb] : "f32x4.convert_i32x4_u",
 
+        V128Load32Zero : [0xfd, 0xfc] : "v128.load32_zero",
+        V128Load64Zero : [0xfd, 0xfd] : "v128.load64_zero",
+
         // Exception handling proposal
         Try(BlockType<'a>) : [0x06] : "try",
         Catch : [0x07] : "catch",