[wasm] Fix I32ReinterpretF32 and I64ReinterpretF64 on ia32.

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

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/base/platform/elapsed-timer.h"
 #include "src/utils.h"
@@ skipping 1030 matching lines @@
                           WASM_F32_REINTERPRET_I32(WASM_GET_LOCAL(0))),
         WASM_I32V_2(107));
 
   FOR_INT32_INPUTS(i) {
     int32_t expected = *i;
     CHECK_EQ(107, r.Call(expected));
     CHECK_EQ(expected, r.module().ReadMemory(&memory[0]));
   }
 }
 
+WASM_EXEC_TEST(SignallingNanSurvivesI32ReinterpretF32) {
+  WasmRunner<int32_t> r(execution_mode);
+
+  BUILD(r, WASM_I32_REINTERPRET_F32(
+               WASM_SEQ(kExprF32Const, 0x00, 0x00, 0xa0, 0x7f)));
+
+  // This is a signalling nan.
+  CHECK_EQ(0x7fa00000, r.Call());
+}
+
 WASM_EXEC_TEST_WITH_TRAP(LoadMaxUint32Offset) {
   WasmRunner<int32_t> r(execution_mode);
   r.module().AddMemoryElems<int32_t>(8);
 
   BUILD(r, kExprI32Const, 0,  // index
         static_cast<byte>(v8::internal::wasm::WasmOpcodes::LoadStoreOpcodeOf(
             MachineType::Int32(), false)),  // --
         0,                                  // alignment
         U32V_5(0xffffffff));                // offset
 
@@ skipping 1805 matching lines @@
   BUILD(r, WASM_I32_REMS(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)), WASM_DROP,
         WASM_ZERO);
   const int32_t kMin = std::numeric_limits<int32_t>::min();
   CHECK_EQ(0, r.Call(133, 100));
   CHECK_EQ(0, r.Call(kMin, -1));
   CHECK_EQ(0, r.Call(0, 1));
   CHECK_TRAP(r.Call(100, 0));
   CHECK_TRAP(r.Call(-1001, 0));
   CHECK_TRAP(r.Call(kMin, 0));
 }