MIPS:[turbofan] Use Ins, Dins to clear bits instead of And with inverted immediate.

test/unittests/compiler/mips/instruction-selector-mips-unittest.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 "test/unittests/compiler/instruction-selector-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 407 matching lines @@
       EXPECT_EQ(kMipsExt, s[0]->arch_opcode());
       ASSERT_EQ(3U, s[0]->InputCount());
       EXPECT_EQ(lsb, s.ToInt32(s[0]->InputAt(1)));
       int32_t actual_width = (lsb + width > 32) ? (32 - lsb) : width;
       EXPECT_EQ(actual_width, s.ToInt32(s[0]->InputAt(2)));
     }
   }
 }
 
 
+TEST_F(InstructionSelectorTest, Word32AndToClearBits) {
+  TRACED_FORRANGE(int32_t, shift, 1, 31) {
+    int32_t mask = ~((1 << shift) - 1);
+    StreamBuilder m(this, kMachInt32, kMachInt32);
+    m.Return(m.Word32And(m.Parameter(0), m.Int32Constant(mask)));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMipsIns, s[0]->arch_opcode());
+    ASSERT_EQ(3U, s[0]->InputCount());
+    EXPECT_EQ(0, s.ToInt32(s[0]->InputAt(1)));
+    EXPECT_EQ(shift, s.ToInt32(s[0]->InputAt(2)));
+  }
+  TRACED_FORRANGE(int32_t, shift, 1, 31) {
+    int32_t mask = ~((1 << shift) - 1);
+    StreamBuilder m(this, kMachInt32, kMachInt32);
+    m.Return(m.Word32And(m.Int32Constant(mask), m.Parameter(0)));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMipsIns, s[0]->arch_opcode());
+    ASSERT_EQ(3U, s[0]->InputCount());
+    EXPECT_EQ(0, s.ToInt32(s[0]->InputAt(1)));
+    EXPECT_EQ(shift, s.ToInt32(s[0]->InputAt(2)));
+  }
+}
+
+
 // ----------------------------------------------------------------------------
 // MUL/DIV instructions.
 // ----------------------------------------------------------------------------
 
 
 typedef InstructionSelectorTestWithParam<MachInst2>
     InstructionSelectorMulDivTest;
 
 
 TEST_P(InstructionSelectorMulDivTest, Parameter) {
@@ skipping 571 matching lines @@
   EXPECT_EQ(kMipsFloat64Min, s[0]->arch_opcode());
   ASSERT_EQ(2U, s[0]->InputCount());
   ASSERT_EQ(1U, s[0]->OutputCount());
   EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8