[turbofan] Add support for Int32SubWithOverflow.

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

 // Copyright 2014 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 <functional>
 #include <limits>
 
 #include "test/cctest/cctest.h"
 #include "test/cctest/compiler/codegen-tester.h"
 #include "test/cctest/compiler/value-helper.h"
@@ skipping 3873 matching lines @@
 
 
 static bool sadd_overflow(int32_t x, int32_t y, int32_t* val) {
   int32_t v =
       static_cast<int32_t>(static_cast<uint32_t>(x) + static_cast<uint32_t>(y));
   *val = v;
   return (((v ^ x) & (v ^ y)) >> 31) & 1;
 }
 
 
+static bool ssub_overflow(int32_t x, int32_t y, int32_t* val) {
+  int32_t v =
+      static_cast<int32_t>(static_cast<uint32_t>(x) - static_cast<uint32_t>(y));
+  *val = v;
+  return (((v ^ x) & (v ^ ~y)) >> 31) & 1;
+}
+
+
 TEST(RunInt32AddWithOverflowP) {
   int32_t actual_val = -1;
   RawMachineAssemblerTester<int32_t> m;
   Int32BinopTester bt(&m);
   Node* val, *ovf;
   m.Int32AddWithOverflow(bt.param0, bt.param1, &val, &ovf);
   m.StoreToPointer(&actual_val, kMachineWord32, val);
   bt.AddReturn(ovf);
   FOR_INT32_INPUTS(i) {
     FOR_INT32_INPUTS(j) {
@@ skipping 61 matching lines @@
   bt.AddReturn(val);
   FOR_UINT32_INPUTS(i) {
     FOR_UINT32_INPUTS(j) {
       int32_t expected;
       if (sadd_overflow(*i, *j, &expected)) expected = ~expected;
       CHECK_EQ(expected, bt.call(*i, *j));
     }
   }
 }
 
+
+TEST(RunInt32SubWithOverflowP) {
+  int32_t actual_val = -1;
+  RawMachineAssemblerTester<int32_t> m;
+  Int32BinopTester bt(&m);
+  Node* val, *ovf;
+  m.Int32SubWithOverflow(bt.param0, bt.param1, &val, &ovf);
+  m.StoreToPointer(&actual_val, kMachineWord32, val);
+  bt.AddReturn(ovf);
+  FOR_INT32_INPUTS(i) {
+    FOR_INT32_INPUTS(j) {
+      int32_t expected_val;
+      int expected_ovf = ssub_overflow(*i, *j, &expected_val);
+      CHECK_EQ(expected_ovf, bt.call(*i, *j));
+      CHECK_EQ(expected_val, actual_val);
+    }
+  }
+}
+
+
+TEST(RunInt32SubWithOverflowImm) {
+  int32_t actual_val = -1, expected_val = 0;
+  FOR_INT32_INPUTS(i) {
+    {
+      RawMachineAssemblerTester<int32_t> m(kMachineWord32);
+      Node* val, *ovf;
+      m.Int32SubWithOverflow(m.Int32Constant(*i), m.Parameter(0), &val, &ovf);
+      m.StoreToPointer(&actual_val, kMachineWord32, val);
+      m.Return(ovf);
+      FOR_INT32_INPUTS(j) {
+        int expected_ovf = ssub_overflow(*i, *j, &expected_val);
+        CHECK_EQ(expected_ovf, m.Call(*j));
+        CHECK_EQ(expected_val, actual_val);
+      }
+    }
+    {
+      RawMachineAssemblerTester<int32_t> m(kMachineWord32);
+      Node* val, *ovf;
+      m.Int32SubWithOverflow(m.Parameter(0), m.Int32Constant(*i), &val, &ovf);
+      m.StoreToPointer(&actual_val, kMachineWord32, val);
+      m.Return(ovf);
+      FOR_INT32_INPUTS(j) {
+        int expected_ovf = ssub_overflow(*j, *i, &expected_val);
+        CHECK_EQ(expected_ovf, m.Call(*j));
+        CHECK_EQ(expected_val, actual_val);
+      }
+    }
+    FOR_INT32_INPUTS(j) {
+      RawMachineAssemblerTester<int32_t> m;
+      Node* val, *ovf;
+      m.Int32SubWithOverflow(m.Int32Constant(*i), m.Int32Constant(*j), &val,
+                             &ovf);
+      m.StoreToPointer(&actual_val, kMachineWord32, val);
+      m.Return(ovf);
+      int expected_ovf = ssub_overflow(*i, *j, &expected_val);
+      CHECK_EQ(expected_ovf, m.Call());
+      CHECK_EQ(expected_val, actual_val);
+    }
+  }
+}
+
+
+TEST(RunInt32SubWithOverflowInBranchP) {
+  MLabel blocka, blockb;
+  RawMachineAssemblerTester<int32_t> m;
+  Int32BinopTester bt(&m);
+  Node* val, *ovf;
+  m.Int32SubWithOverflow(bt.param0, bt.param1, &val, &ovf);
+  m.Branch(ovf, &blocka, &blockb);
+  m.Bind(&blocka);
+  bt.AddReturn(m.Word32Not(val));
+  m.Bind(&blockb);
+  bt.AddReturn(val);
+  FOR_UINT32_INPUTS(i) {
+    FOR_UINT32_INPUTS(j) {
+      int32_t expected;
+      if (ssub_overflow(*i, *j, &expected)) expected = ~expected;
+      CHECK_EQ(expected, bt.call(*i, *j));
+    }
+  }
+}
+
 #endif  // V8_TURBOFAN_TARGET