Fix failure in mjsunit/wasm/embenchen/box2d on 32-bit architectures that do not support unaligned a…

src/wasm/wasm-external-refs.cc

 // Copyright 2016 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 <math.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <limits>
 
 #include "include/v8config.h"
 
 #include "src/base/bits.h"
 #include "src/utils.h"
 #include "src/wasm/wasm-external-refs.h"
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 
 void f32_trunc_wrapper(float* param) { *param = truncf(*param); }
 
 void f32_floor_wrapper(float* param) { *param = floorf(*param); }
 
 void f32_ceil_wrapper(float* param) { *param = ceilf(*param); }
 
 void f32_nearest_int_wrapper(float* param) { *param = nearbyintf(*param); }
 
-void f64_trunc_wrapper(double* param) { *param = trunc(*param); }
+void f64_trunc_wrapper(double* param) {
+  WriteDoubleValue(param, trunc(ReadDoubleValue(param)));
+}
 
-void f64_floor_wrapper(double* param) { *param = floor(*param); }
+void f64_floor_wrapper(double* param) {
+  WriteDoubleValue(param, floor(ReadDoubleValue(param)));
+}
 
-void f64_ceil_wrapper(double* param) { *param = ceil(*param); }
+void f64_ceil_wrapper(double* param) {
+  WriteDoubleValue(param, ceil(ReadDoubleValue(param)));
+}
 
-void f64_nearest_int_wrapper(double* param) { *param = nearbyint(*param); }
+void f64_nearest_int_wrapper(double* param) {
+  WriteDoubleValue(param, nearbyint(ReadDoubleValue(param)));
+}
 
 void int64_to_float32_wrapper(int64_t* input, float* output) {
   *output = static_cast<float>(*input);
 }
 
 void uint64_to_float32_wrapper(uint64_t* input, float* output) {
 #if V8_CC_MSVC
   // With MSVC we use static_cast<float>(uint32_t) instead of
   // static_cast<float>(uint64_t) to achieve round-to-nearest-ties-even
   // semantics. The idea is to calculate
@@ skipping 154 matching lines @@
   double x = ReadDoubleValue(param0);
   double y = ReadDoubleValue(param1);
   if (std::isnan(y) || ((x == 1 || x == -1) && std::isinf(y))) {
     WriteDoubleValue(param0, std::numeric_limits<double>::quiet_NaN());
   }
   WriteDoubleValue(param0, Pow(x, y));
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8