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1 // -*- C++ -*-
2 //===----------------------- support/ibm/support.h ----------------------===//
3 //
4 //                     The LLVM Compiler Infrastructure
5 //
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
8 //
9 //===----------------------------------------------------------------------===//
10 
11 #ifndef _LIBCPP_SUPPORT_IBM_SUPPORT_H
12 #define _LIBCPP_SUPPORT_IBM_SUPPORT_H
13 
14 extern "builtin" int __popcnt4(unsigned int);
15 extern "builtin" int __popcnt8(unsigned long long);
16 extern "builtin" unsigned int __cnttz4(unsigned int);
17 extern "builtin" unsigned int __cnttz8(unsigned long long);
18 extern "builtin" unsigned int __cntlz4(unsigned int);
19 extern "builtin" unsigned int __cntlz8(unsigned long long);
20 
21 // Builtin functions for counting population
22 #define __builtin_popcount(x) __popcnt4(x)
23 #define __builtin_popcountll(x) __popcnt8(x)
24 #if defined(__64BIT__)
25 #define __builtin_popcountl(x) __builtin_popcountll(x)
26 #else
27 #define __builtin_popcountl(x) __builtin_popcount(x)
28 #endif
29 
30 // Builtin functions for counting trailing zeros
31 #define __builtin_ctz(x) __cnttz4(x)
32 #define __builtin_ctzll(x) __cnttz8(x)
33 #if defined(__64BIT__)
34 #define __builtin_ctzl(x) __builtin_ctzll(x)
35 #else
36 #define __builtin_ctzl(x) __builtin_ctz(x)
37 #endif
38 
39 // Builtin functions for counting leading zeros
40 #define __builtin_clz(x) __cntlz4(x)
41 #define __builtin_clzll(x) __cntlz8(x)
42 #if defined(__64BIT__)
43 #define __builtin_clzl(x) __builtin_clzll(x)
44 #else
45 #define __builtin_clzl(x) __builtin_clz(x)
46 #endif
47 
48 #if defined(__64BIT__)
49 #define __SIZE_WIDTH__ 64
50 #else
51 #define __SIZE_WIDTH__ 32
52 #endif
53 
54 #endif // _LIBCPP_SUPPORT_IBM_SUPPORT_H
55