[wasm] Int64Lowering of Word64Popcnt.

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

 // Copyright 2015 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 <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/wasm/wasm-macro-gen.h"
 
@@ skipping 52 matching lines @@
   V(I64LtS, true)               \
   V(I64LeS, true)               \
   V(I64LtU, true)               \
   V(I64LeU, true)               \
   V(I64GtS, true)               \
   V(I64GeS, true)               \
   V(I64GtU, true)               \
   V(I64GeU, true)               \
   V(I64Clz, false)              \
   V(I64Ctz, false)              \
-  V(I64Popcnt, false)           \
+  V(I64Popcnt, !MIPS_OR_X87)    \
   V(I32ConvertI64, true)        \
   V(I64SConvertF32, false)      \
   V(I64SConvertF64, false)      \
   V(I64UConvertF32, false)      \
   V(I64UConvertF64, false)      \
   V(I64SConvertI32, true)       \
   V(I64UConvertI32, true)       \
   V(F32SConvertI64, true)       \
   V(F32UConvertI64, true)       \
   V(F64SConvertI64, true)       \
@@ skipping 428 matching lines @@
   BUILD(r, WASM_I64_UCONVERT_I32(WASM_GET_LOCAL(0)));
   FOR_UINT32_INPUTS(i) { CHECK_EQ(static_cast<uint64_t>(*i), r.Call(*i)); }
 }
 
 // kExprF64ReinterpretI64:
 // kExprI64ReinterpretF64:
 
 // kExprI64Clz:
 // kExprI64Ctz:
 // kExprI64Popcnt:
+TEST(Run_WasmI64Popcnt) {
+  struct {
+    int64_t expected;
+    uint64_t input;
+  } values[] = {{64, 0xffffffffffffffff},
+                {0, 0x0000000000000000},
+                {2, 0x0000080000008000},
+                {26, 0x1123456782345678},
+                {38, 0xffedcba09edcba09}};
+
+  WasmRunner<int64_t> r(MachineType::Uint64());
+  BUILD(r, WASM_I64_POPCNT(WASM_GET_LOCAL(0)));
+  for (size_t i = 0; i < arraysize(values); i++) {
+    CHECK_EQ(values[i].expected, r.Call(values[i].input));
+  }
+}
 
 // kExprF32SConvertI64:
 TEST(Run_WasmF32SConvertI64) {
   REQUIRE(F32SConvertI64);
   WasmRunner<float> r(MachineType::Int64());
   BUILD(r, WASM_F32_SCONVERT_I64(WASM_GET_LOCAL(0)));
   FOR_INT64_INPUTS(i) { CHECK_EQ(static_cast<float>(*i), r.Call(*i)); }
 }
 // kExprF32UConvertI64:
 TEST(Run_WasmF32UConvertI64) {
@@ skipping 750 matching lines @@
   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));
   }
 }