[wasm] New implementation of popcnt and ctz.

src/wasm/wasm-external-refs.cc

 // Copyright 2016 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 <math.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <limits>
 
 #include "include/v8config.h"
 
+#include "src/base/bits.h"
 #include "src/wasm/wasm-external-refs.h"
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 
 void f32_trunc_wrapper(float* param) { *param = truncf(*param); }
 
 void f32_floor_wrapper(float* param) { *param = floorf(*param); }
 
@@ skipping 147 matching lines @@
   return 1;
 }
 
 int32_t uint64_mod_wrapper(uint64_t* dst, uint64_t* src) {
   if (*src == 0) {
     return 0;
   }
   *dst %= *src;
   return 1;
 }
+
+uint32_t word32_ctz_wrapper(uint32_t* input) {
+  return static_cast<uint32_t>(base::bits::CountTrailingZeros32(*input));
+}
+
+uint32_t word64_ctz_wrapper(uint64_t* input) {
+  return static_cast<uint32_t>(base::bits::CountTrailingZeros64(*input));
+}
+
+uint32_t word32_popcnt_wrapper(uint32_t* input) {
+  return static_cast<uint32_t>(base::bits::CountPopulation(*input));
+}
+
+uint32_t word64_popcnt_wrapper(uint64_t* input) {
+  return static_cast<uint32_t>(base::bits::CountPopulation(*input));
+}
+
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8