Implementation of global.get/set for reftypes in LLVM IR

This change implements new DAG notes GLOBAL_GET/GLOBAL_SET, and
lowering methods for load and stores of reference types from IR
globals. Once the lowering creates the new nodes, tablegen pattern
matches those and converts them to Wasm global.get/set.

Reviewed By: tlively

Differential Revision: https://reviews.llvm.org/D95425

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyFastISel.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyFastISel.cpp
index cb0cdf1..171d59a 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyFastISel.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyFastISel.cpp
@@ -130,9 +130,12 @@ private:
     case MVT::i64:
     case MVT::f32:
     case MVT::f64:
+      return VT;
     case MVT::funcref:
     case MVT::externref:
-      return VT;
+      if (Subtarget->hasReferenceTypes())
+        return VT;
+      break;
     case MVT::f16:
       return MVT::f32;
     case MVT::v16i8: