[wasm] Add I64Eqz operator.

R=ahaas@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1798863004

Cr-Commit-Position: refs/heads/master@{#34757}

src/compiler/wasm-compiler.cc

@@ -865,6 +865,9 @@ Node* WasmGraphBuilder::Unop(wasm::WasmOpcode opcode, Node* input) {
     // kExprI64Ctz:
     // kExprI64Popcnt:
     // kExprF32SConvertI64:
+    case wasm::kExprI64Eqz:
+      op = m->Word64Equal();
+      return graph()->NewNode(op, input, jsgraph()->Int64Constant(0));
     case wasm::kExprF32SConvertI64:
       if (m->Is32()) {
         return BuildF32SConvertI64(input);

src/wasm/wasm-macro-gen.h

@@ -399,6 +399,7 @@ class LocalDeclEncoder {
 #define WASM_I32_CLZ(x) kExprI32Clz, x
 #define WASM_I32_CTZ(x) kExprI32Ctz, x
 #define WASM_I32_POPCNT(x) kExprI32Popcnt, x
+#define WASM_I32_EQZ(x) kExprI32Eqz, x
 
 //------------------------------------------------------------------------------
 // Int64 operations
@@ -431,6 +432,7 @@ class LocalDeclEncoder {
 #define WASM_I64_CLZ(x) kExprI64Clz, x
 #define WASM_I64_CTZ(x) kExprI64Ctz, x
 #define WASM_I64_POPCNT(x) kExprI64Popcnt, x
+#define WASM_I64_EQZ(x) kExprI64Eqz, x
 
 //------------------------------------------------------------------------------
 // Float32 operations

src/wasm/wasm-opcodes.h

@@ -175,6 +175,7 @@ struct WasmName {
   V(I64Clz, 0x72, l_l)            \
   V(I64Ctz, 0x73, l_l)            \
   V(I64Popcnt, 0x74, l_l)         \
+  V(I64Eqz, 0xba, i_l)            \
   V(F32Add, 0x75, f_ff)           \
   V(F32Sub, 0x76, f_ff)           \
   V(F32Mul, 0x77, f_ff)           \

test/cctest/wasm/test-run-wasm-64.cc

@@ -1209,3 +1209,15 @@ TEST(Run_Wasm_I64Global) {
     CHECK_EQ(expected, *global);
   }
 }
+
+TEST(Run_WasmI64Eqz) {
+  REQUIRE(I64Eq);
+
+  WasmRunner<int32_t> r(MachineType::Int64());
+  BUILD(r, WASM_I64_EQZ(WASM_GET_LOCAL(0)));
+
+  FOR_INT64_INPUTS(i) {
+    int32_t result = *i == 0 ? 1 : 0;
+    CHECK_EQ(result, r.Call(*i));
+  }
+}

test/unittests/wasm/wasm-macro-gen-unittest.cc

@@ -185,6 +185,8 @@ TEST_F(WasmMacroGenTest, Int32Ops) {
   EXPECT_SIZE(3, WASM_I32_CLZ(WASM_ZERO));
   EXPECT_SIZE(3, WASM_I32_CTZ(WASM_ZERO));
   EXPECT_SIZE(3, WASM_I32_POPCNT(WASM_ZERO));
+
+  EXPECT_SIZE(3, WASM_I32_EQZ(WASM_ZERO));
 }
 
 
@@ -219,6 +221,8 @@ TEST_F(WasmMacroGenTest, Int64Ops) {
   EXPECT_SIZE(3, WASM_I64_CLZ(WASM_ZERO));
   EXPECT_SIZE(3, WASM_I64_CTZ(WASM_ZERO));
   EXPECT_SIZE(3, WASM_I64_POPCNT(WASM_ZERO));
+
+  EXPECT_SIZE(3, WASM_I64_EQZ(WASM_ZERO));
 }