From 3c78269032071490bc13dc5dbac02567d4d491e0 Mon Sep 17 00:00:00 2001
From: Thomas Lively <7121787+tlively@users.noreply.github.com>
Date: Thu, 3 Oct 2019 18:07:02 -0700
Subject: v8x16.swizzle (#2368)

As specified at
https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md#swizzling-using-variable-indices.
---
 src/wasm/literal.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/wasm/literal.cpp')

diff --git a/src/wasm/literal.cpp b/src/wasm/literal.cpp
index b382d1a3d..7f0c9fa6b 100644
--- a/src/wasm/literal.cpp
+++ b/src/wasm/literal.cpp
@@ -1867,4 +1867,15 @@ Literal Literal::widenHighUToVecI32x4() const {
   return widen<4, &Literal::getLanesUI16x8, LaneOrder::High>(*this);
 }
 
+Literal Literal::swizzleVec8x16(const Literal& other) const {
+  auto lanes = getLanesUI8x16();
+  auto indices = other.getLanesUI8x16();
+  LaneArray<16> result;
+  for (size_t i = 0; i < 16; ++i) {
+    size_t index = indices[i].geti32();
+    result[i] = index >= 16 ? Literal(int32_t(0)) : lanes[index];
+  }
+  return Literal(result);
+}
+
 } // namespace wasm
-- 
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