MIPS: Fix '[turbofan] Introduce new operators Float32SubPreserveNan and Float64SubPreserveNan'.

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"
 
@@ skipping 591 matching lines @@
   FOR_FLOAT32_INPUTS(i) {
     CHECK_EQ(0x80000000,
              bit_cast<uint32_t>(*i) ^ bit_cast<uint32_t>(r.Call(*i)));
   }
 }
 
 WASM_EXEC_TEST(Float32SubMinusZero) {
   WasmRunner<float> r(execution_mode, MachineType::Float32());
   BUILD(r, WASM_F32_SUB(WASM_F32(-0.0), WASM_GET_LOCAL(0)));
 
-  CHECK_EQ(0x7fe00000, bit_cast<uint32_t>(r.Call(bit_cast<float>(0x7fa00000))));
+  uint32_t sNanValue =
+      bit_cast<uint32_t>(std::numeric_limits<float>::signaling_NaN());
+  uint32_t payload = 0x00200000;
+
+  static const uint32_t kSignalingBit = 1 << 22;
+  uint32_t qNanValue =
+      bit_cast<uint32_t>(std::numeric_limits<float>::quiet_NaN());
+  if ((qNanValue & kSignalingBit) != 0) {
+    // On some machines, the signaling bit set indicates it's a quiet NaN.
+    qNanValue = sNanValue | kSignalingBit;
+  } else {
+    // On others, the signaling bit set indicates it's a signaling NaN.
+    qNanValue = qNanValue & ~kSignalingBit;
+  }
+  uint32_t expected = qNanValue | payload;
+  uint32_t operand = sNanValue | payload;
+  CHECK_EQ(expected, bit_cast<uint32_t>(r.Call(bit_cast<float>(operand))));
 }
 
 WASM_EXEC_TEST(Float64SubMinusZero) {
   WasmRunner<double> r(execution_mode, MachineType::Float64());
   BUILD(r, WASM_F64_SUB(WASM_F64(-0.0), WASM_GET_LOCAL(0)));
 
-  CHECK_EQ(0x7ff8123456789abc,
-           bit_cast<uint64_t>(r.Call(bit_cast<double>(0x7ff0123456789abc))));
+  uint64_t sNanValue =
+      bit_cast<uint64_t>(std::numeric_limits<double>::signaling_NaN());
+  uint64_t payload = 0x0000123456789abc;
+
+  static const uint64_t kSignalingBit = 1ULL << 51;
+  uint64_t qNanValue =
+      bit_cast<uint64_t>(std::numeric_limits<double>::quiet_NaN());
+  if ((qNanValue & kSignalingBit) != 0) {
+    // On some machines, the signaling bit set indicates it's a quiet NaN.
+    qNanValue = sNanValue | kSignalingBit;
+  } else {
+    // On others, the signaling bit set indicates it's a signaling NaN.
+    qNanValue = qNanValue & ~kSignalingBit;
+  }
+  uint64_t expected = qNanValue | payload;
+  uint64_t operand = sNanValue | payload;
+  CHECK_EQ(expected, bit_cast<uint64_t>(r.Call(bit_cast<double>(operand))));
 }
 
 WASM_EXEC_TEST(Float64Neg) {
   WasmRunner<double> r(execution_mode, MachineType::Float64());
   BUILD(r, WASM_F64_NEG(WASM_GET_LOCAL(0)));
 
   FOR_FLOAT64_INPUTS(i) {
     CHECK_EQ(0x8000000000000000,
              bit_cast<uint64_t>(*i) ^ bit_cast<uint64_t>(r.Call(*i)));
   }
@@ skipping 2202 matching lines @@
                         MachineType::Int32());
   BUILD(r, WASM_I32_REMS(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)), 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));
 }