From 616abe47020c90278eaf8d14ae9815c31d2d14fb Mon Sep 17 00:00:00 2001
From: Thomas Lively <7121787+tlively@users.noreply.github.com>
Date: Wed, 5 Jun 2019 19:34:34 -0700
Subject: Use splatted zero vector in makeZero (#2164)

This prevents the optimizer from producing v128.const instructions,
which are not supported by V8 at this time.
---
 src/ir/literal-utils.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src')

diff --git a/src/ir/literal-utils.h b/src/ir/literal-utils.h
index 543c34e9f..63a2b3b44 100644
--- a/src/ir/literal-utils.h
+++ b/src/ir/literal-utils.h
@@ -17,6 +17,7 @@
 #ifndef wasm_ir_literal_utils_h
 #define wasm_ir_literal_utils_h
 
+#include "wasm-builder.h"
 #include "wasm.h"
 
 namespace wasm {
@@ -31,6 +32,13 @@ inline Expression* makeFromInt32(int32_t x, Type type, Module& wasm) {
 }
 
 inline Expression* makeZero(Type type, Module& wasm) {
+  // TODO: Switch to using v128.const once V8 supports it
+  // (https://bugs.chromium.org/p/v8/issues/detail?id=8460)
+  if (type == v128) {
+    Builder builder(wasm);
+    return builder.makeUnary(SplatVecI32x4,
+                             builder.makeConst(Literal(int32_t(0))));
+  }
   return makeFromInt32(0, type, wasm);
 }
 
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