support.h revision 1.1.1.1 
1// -*- C++ -*-
2//===-----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_SUPPORT_IBM_SUPPORT_H
11#define _LIBCPP_SUPPORT_IBM_SUPPORT_H
12
13extern "builtin" int __popcnt4(unsigned int);
14extern "builtin" int __popcnt8(unsigned long long);
15extern "builtin" unsigned int __cnttz4(unsigned int);
16extern "builtin" unsigned int __cnttz8(unsigned long long);
17extern "builtin" unsigned int __cntlz4(unsigned int);
18extern "builtin" unsigned int __cntlz8(unsigned long long);
19
20// Builtin functions for counting population
21#define __builtin_popcount(x) __popcnt4(x)
22#define __builtin_popcountll(x) __popcnt8(x)
23#if defined(__64BIT__)
24#define __builtin_popcountl(x) __builtin_popcountll(x)
25#else
26#define __builtin_popcountl(x) __builtin_popcount(x)
27#endif
28
29// Builtin functions for counting trailing zeros
30#define __builtin_ctz(x) __cnttz4(x)
31#define __builtin_ctzll(x) __cnttz8(x)
32#if defined(__64BIT__)
33#define __builtin_ctzl(x) __builtin_ctzll(x)
34#else
35#define __builtin_ctzl(x) __builtin_ctz(x)
36#endif
37
38// Builtin functions for counting leading zeros
39#define __builtin_clz(x) __cntlz4(x)
40#define __builtin_clzll(x) __cntlz8(x)
41#if defined(__64BIT__)
42#define __builtin_clzl(x) __builtin_clzll(x)
43#else
44#define __builtin_clzl(x) __builtin_clz(x)
45#endif
46
47#if defined(__64BIT__)
48#define __SIZE_WIDTH__ 64
49#else
50#define __SIZE_WIDTH__ 32
51#endif
52
53#endif // _LIBCPP_SUPPORT_IBM_SUPPORT_H
54