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

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 710b59276f97bbd2db466241958d3baa10a65318..efc0fd103f2e55f54fc33d1f8e8296ce98798950 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -609,15 +609,46 @@ 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) {