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. 4 5 // +build gccgo 6 7 #include <errno.h> 8 #include <stdint.h> 9 #include <unistd.h> 10 11 #define _STRINGIFY2_(x) #x 12 #define _STRINGIFY_(x) _STRINGIFY2_(x) 13 #define GOSYM_PREFIX _STRINGIFY_(__USER_LABEL_PREFIX__) 14 15 extern intptr_t popcount(uintptr_t x) __asm__(GOSYM_PREFIX GOPKGPATH ".popcount"); 16 popcount(uintptr_t x)17intptr_t popcount(uintptr_t x) { 18 return __builtin_popcountl((unsigned long)(x)); 19 } 20