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, 5 insertions, 0 deletions

diff --git a/src/ir/effects.h b/src/ir/effects.h
index 5483242b5..71957d1f8 100644
--- a/src/ir/effects.h
+++ b/src/ir/effects.h
@@ -415,6 +415,11 @@ private:
       }
       parent.implicitTrap = true;
     }
+    void visitPrefetch(Prefetch* curr) {
+      // Do not reorder with respect to other memory ops
+      parent.writesMemory = true;
+      parent.readsMemory = true;
+    }
     void visitMemoryInit(MemoryInit* curr) {
       parent.writesMemory = true;
       parent.implicitTrap = true;