github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/tools/container/intsets/popcnt_gccgo_c.c (about)

     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  
    17  intptr_t popcount(uintptr_t x) {
    18  	return __builtin_popcountl((unsigned long)(x));
    19  }