1 // Copyright 2015 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
11 #define _STRINGIFY2_(x) #x
12 #define _STRINGIFY_(x) _STRINGIFY2_(x)
13 #define GOSYM_PREFIX _STRINGIFY_(__USER_LABEL_PREFIX__)
15 extern intptr_t popcount(uintptr_t x) __asm__(GOSYM_PREFIX GOPKGPATH ".popcount");
17 intptr_t popcount(uintptr_t x) {
18 return __builtin_popcountl((unsigned long)(x));