[wasm] Fixed F32Neg and F64Neg for -0.0.

test/cctest/wasm/test-run-wasm.cc

Index: test/cctest/wasm/test-run-wasm.cc
diff --git a/test/cctest/wasm/test-run-wasm.cc b/test/cctest/wasm/test-run-wasm.cc
index 7db7cb740e6483f4a446fb81c23331df7c24886b..7f456a7f025c8822be66b821e967921c23e616d1 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -1148,6 +1148,30 @@ TEST(Run_WasmFloat64Unops) {
 }
 
 
+TEST(Run_WasmFloat32Neg) {
+  WasmRunner<float> r(MachineType::Float32());
+  BUILD(r, WASM_F32_NEG(WASM_GET_LOCAL(0)));
+
+  FOR_FLOAT32_INPUTS(i) { CheckFloatEq(-(*i), r.Call(*i)); }
+
+  // The difference between +0 and -0 matters here.
+  CHECK_EQ(bit_cast<uint32_t>(-0.0f), bit_cast<uint32_t>(r.Call(0.0f)));
+  CHECK_EQ(bit_cast<uint32_t>(0.0f), bit_cast<uint32_t>(r.Call(-0.0f)));
+}
+
+
+TEST(Run_WasmFloat64Neg) {
+  WasmRunner<double> r(MachineType::Float64());
+  BUILD(r, WASM_F64_NEG(WASM_GET_LOCAL(0)));
+
+  FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(-(*i), r.Call(*i)); }
+
+  // The difference between +0 and -0 matters here.
+  CHECK_EQ(bit_cast<uint64_t>(-0.0), bit_cast<uint64_t>(r.Call(0.0)));
+  CHECK_EQ(bit_cast<uint64_t>(0.0), bit_cast<uint64_t>(r.Call(-0.0)));
+}
+
+
 TEST(Run_Wasm_IfElse_P) {
   WasmRunner<int32_t> r(MachineType::Int32());
   // if (p0) return 11; else return 22;