[wasm] Int64Lowering of Int64Sub on ia32 and arm.

test/cctest/compiler/test-run-machops.cc

Index: test/cctest/compiler/test-run-machops.cc
diff --git a/test/cctest/compiler/test-run-machops.cc b/test/cctest/compiler/test-run-machops.cc
index 13bce4a612540875270900c2088df2684d84c6a8..c55147775ed6d81df03797c2c7335960eafbb2c5 100644
--- a/test/cctest/compiler/test-run-machops.cc
+++ b/test/cctest/compiler/test-run-machops.cc
@@ -4202,6 +4202,7 @@ int64_t ToInt64(uint32_t low, uint32_t high) {
 }
 
 #if V8_TARGET_ARCH_32_BIT
+
 TEST(RunInt32PairAdd) {
   BufferedRawMachineAssemblerTester<int32_t> m(
       MachineType::Int32(), MachineType::Int32(), MachineType::Int32(),
@@ -4264,6 +4265,69 @@ TEST(RunInt32PairAddWithSharedInput) {
   TestInt32PairAddWithSharedInput(0, 0, 0, 1);
   TestInt32PairAddWithSharedInput(1, 1, 0, 0);
 }
+
+TEST(RunInt32PairSub) {
+  BufferedRawMachineAssemblerTester<int32_t> m(
+      MachineType::Int32(), MachineType::Int32(), MachineType::Int32(),
+      MachineType::Int32());
+
+  uint32_t high;
+  uint32_t low;
+
+  Node* PairSub = m.Int32PairSub(m.Parameter(0), m.Parameter(1), m.Parameter(2),
+                                 m.Parameter(3));
+
+  m.StoreToPointer(&low, MachineRepresentation::kWord32,
+                   m.Projection(0, PairSub));
+  m.StoreToPointer(&high, MachineRepresentation::kWord32,
+                   m.Projection(1, PairSub));
+  m.Return(m.Int32Constant(74));
+
+  FOR_INT64_INPUTS(i) {
+    FOR_INT64_INPUTS(j) {
+      m.Call(static_cast<int32_t>(*i & 0xffffffff),
+             static_cast<int32_t>(*i >> 32),
+             static_cast<int32_t>(*j & 0xffffffff),
+             static_cast<int32_t>(*j >> 32));
+      CHECK_EQ(*i - *j, ToInt64(low, high));
+    }
+  }
+}
+
+void TestInt32PairSubWithSharedInput(int a, int b, int c, int d) {
+  BufferedRawMachineAssemblerTester<int32_t> m(MachineType::Uint32(),
+                                               MachineType::Uint32());
+
+  uint32_t high;
+  uint32_t low;
+
+  Node* PairSub = m.Int32PairSub(m.Parameter(a), m.Parameter(b), m.Parameter(c),
+                                 m.Parameter(d));
+
+  m.StoreToPointer(&low, MachineRepresentation::kWord32,
+                   m.Projection(0, PairSub));
+  m.StoreToPointer(&high, MachineRepresentation::kWord32,
+                   m.Projection(1, PairSub));
+  m.Return(m.Int32Constant(74));
+
+  FOR_UINT32_INPUTS(i) {
+    FOR_UINT32_INPUTS(j) {
+      m.Call(*i, *j);
+      uint32_t inputs[] = {*i, *j};
+      CHECK_EQ(ToInt64(inputs[a], inputs[b]) - ToInt64(inputs[c], inputs[d]),
+               ToInt64(low, high));
+    }
+  }
+}
+
+TEST(RunInt32PairSubWithSharedInput) {
+  TestInt32PairSubWithSharedInput(0, 0, 0, 0);
+  TestInt32PairSubWithSharedInput(1, 0, 0, 0);
+  TestInt32PairSubWithSharedInput(0, 1, 0, 0);
+  TestInt32PairSubWithSharedInput(0, 0, 1, 0);
+  TestInt32PairSubWithSharedInput(0, 0, 0, 1);
+  TestInt32PairSubWithSharedInput(1, 1, 0, 0);
+}
 #endif
 
 TEST(RunDeadChangeFloat64ToInt32) {