Simd i8x16.extract_lane_s instruction implementation. (#802)

Including:
1. All necessary code for SIMD lanes accessing.
2. i8x16.extract_lane_s implementation.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/binary-reader-interp.cc b/src/binary-reader-interp.cc
index b8907458..c8fcc6e1 100644
--- a/src/binary-reader-interp.cc
+++ b/src/binary-reader-interp.cc
@@ -195,6 +195,7 @@ class BinaryReaderInterp : public BinaryReaderNop {
   wabt::Result OnTernaryExpr(wabt::Opcode opcode) override;
   wabt::Result OnUnreachableExpr() override;
   wabt::Result EndFunctionBody(Index index) override;
+  wabt::Result OnSimdLaneOpExpr(wabt::Opcode opcode, uint64_t value) override;
 
   wabt::Result EndElemSegmentInitExpr(Index index) override;
   wabt::Result OnElemSegmentFunctionIndexCount(Index index,
@@ -1179,6 +1180,14 @@ wabt::Result BinaryReaderInterp::OnTernaryExpr(wabt::Opcode opcode) {
   return wabt::Result::Ok;
 }
 
+wabt::Result BinaryReaderInterp::OnSimdLaneOpExpr(wabt::Opcode opcode, 
+                                                      uint64_t value) {
+  CHECK_RESULT(typechecker_.OnSimdLaneOp(opcode, value));
+  CHECK_RESULT(EmitOpcode(opcode));
+  CHECK_RESULT(EmitI8(static_cast<uint8_t>(value)));
+  return wabt::Result::Ok;
+}
+
 wabt::Result BinaryReaderInterp::OnAtomicLoadExpr(Opcode opcode,
                                                   uint32_t alignment_log2,
                                                   Address offset) {