Prototype prefetch instructions (#3467)

As proposed in https://github.com/WebAssembly/simd/pull/352, using the opcodes
used in the LLVM and V8 implementations.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/wasm/wasm-s-parser.cpp b/src/wasm/wasm-s-parser.cpp
index 20e99436a..20ab4f3d2 100644
--- a/src/wasm/wasm-s-parser.cpp
+++ b/src/wasm/wasm-s-parser.cpp
@@ -1662,6 +1662,12 @@ SExpressionWasmBuilder::makeSIMDLoadStoreLane(Element& s,
   return ret;
 }
 
+Expression* SExpressionWasmBuilder::makePrefetch(Element& s, PrefetchOp op) {
+  Address offset, align;
+  size_t i = parseMemAttributes(s, offset, align, /*defaultAlign*/ 1);
+  return Builder(wasm).makePrefetch(op, offset, align, parseExpression(s[i]));
+}
+
 Expression* SExpressionWasmBuilder::makeMemoryInit(Element& s) {
   auto ret = allocator.alloc<MemoryInit>();
   ret->segment = atoi(s[1]->str().c_str());