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/*
* Copyright © 2009 CNRS
* Copyright © 2009-2010 INRIA. All rights reserved.
* Copyright © 2009-2011 Université Bordeaux 1
* Copyright © 2011 Cisco Systems, Inc. All rights reserved.
* See COPYING in top-level directory.
*/
/* Misc internals routines. */
#ifndef HWLOC_PRIVATE_MISC_H
#define HWLOC_PRIVATE_MISC_H
#include <hwloc/autogen/config.h>
#include <private/autogen/config.h>
#include <private/private.h>
/* On some systems, snprintf returns the size of written data, not the actually
* required size. hwloc_snprintf always report the actually required size. */
int hwloc_snprintf(char *str, size_t size, const char *format, ...) __hwloc_attribute_format(printf, 3, 4);
/* Check whether needle matches the beginning of haystack, at least n, and up
* to a colon or \0 */
HWLOC_DECLSPEC
int hwloc_namecoloncmp(const char *haystack, const char *needle, size_t n);
/* Compile-time assertion */
#define HWLOC_BUILD_ASSERT(condition) ((void)sizeof(char[1 - 2*!(condition)]))
#define HWLOC_BITS_PER_LONG (HWLOC_SIZEOF_UNSIGNED_LONG * 8)
#define HWLOC_BITS_PER_INT (HWLOC_SIZEOF_UNSIGNED_INT * 8)
#if (HWLOC_BITS_PER_LONG != 32) && (HWLOC_BITS_PER_LONG != 64)
#error "unknown size for unsigned long."
#endif
#if (HWLOC_BITS_PER_INT != 16) && (HWLOC_BITS_PER_INT != 32) && (HWLOC_BITS_PER_INT != 64)
#error "unknown size for unsigned int."
#endif
/**
* ffsl helpers.
*/
#ifdef __GNUC__
# if (__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4))
/* Starting from 3.4, gcc has a long variant. */
# define hwloc_ffsl(x) __builtin_ffsl(x)
# else
# define hwloc_ffs(x) __builtin_ffs(x)
# define HWLOC_NEED_FFSL
# endif
#elif defined(HWLOC_HAVE_FFSL)
# ifndef HWLOC_HAVE_DECL_FFSL
extern int ffsl(long) __hwloc_attribute_const;
# endif
# define hwloc_ffsl(x) ffsl(x)
#elif defined(HWLOC_HAVE_FFS)
# ifndef HWLOC_HAVE_DECL_FFS
extern int ffs(int) __hwloc_attribute_const;
# endif
# define hwloc_ffs(x) ffs(x)
# define HWLOC_NEED_FFSL
#else /* no ffs implementation */
static __hwloc_inline int __hwloc_attribute_const
hwloc_ffsl(unsigned long x)
{
int i;
if (!x)
return 0;
i = 1;
#if HWLOC_BITS_PER_LONG >= 64
if (!(x & 0xfffffffful)) {
x >>= 32;
i += 32;
}
#endif
if (!(x & 0xffffu)) {
x >>= 16;
i += 16;
}
if (!(x & 0xff)) {
x >>= 8;
i += 8;
}
if (!(x & 0xf)) {
x >>= 4;
i += 4;
}
if (!(x & 0x3)) {
x >>= 2;
i += 2;
}
if (!(x & 0x1)) {
x >>= 1;
i += 1;
}
return i;
}
#endif
#ifdef HWLOC_NEED_FFSL
/* We only have an int ffs(int) implementation, build a long one. */
/* First make it 32 bits if it was only 16. */
static __hwloc_inline int __hwloc_attribute_const
hwloc_ffs32(unsigned long x)
{
#if HWLOC_BITS_PER_INT == 16
int low_ffs, hi_ffs;
low_ffs = hwloc_ffs(x & 0xfffful);
if (low_ffs)
return low_ffs;
hi_ffs = hwloc_ffs(x >> 16);
if (hi_ffs)
return hi_ffs + 16;
return 0;
#else
return hwloc_ffs(x);
#endif
}
/* Then make it 64 bit if longs are. */
static __hwloc_inline int __hwloc_attribute_const
hwloc_ffsl(unsigned long x)
{
#if HWLOC_BITS_PER_LONG == 64
int low_ffs, hi_ffs;
low_ffs = hwloc_ffs32(x & 0xfffffffful);
if (low_ffs)
return low_ffs;
hi_ffs = hwloc_ffs32(x >> 32);
if (hi_ffs)
return hi_ffs + 32;
return 0;
#else
return hwloc_ffs32(x);
#endif
}
#endif
/**
* flsl helpers.
*/
#ifdef __GNUC_____
# if (__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4))
# define hwloc_flsl(x) (x ? 8*sizeof(long) - __builtin_clzl(x) : 0)
# else
# define hwloc_fls(x) (x ? 8*sizeof(int) - __builtin_clz(x) : 0)
# define HWLOC_NEED_FLSL
# endif
#elif defined(HWLOC_HAVE_FLSL)
# ifndef HWLOC_HAVE_DECL_FLSL
extern int flsl(long) __hwloc_attribute_const;
# endif
# define hwloc_flsl(x) flsl(x)
#elif defined(HWLOC_HAVE_CLZL)
# ifndef HWLOC_HAVE_DECL_CLZL
extern int clzl(long) __hwloc_attribute_const;
# endif
# define hwloc_flsl(x) (x ? 8*sizeof(long) - clzl(x) : 0)
#elif defined(HWLOC_HAVE_FLS)
# ifndef HWLOC_HAVE_DECL_FLS
extern int fls(int) __hwloc_attribute_const;
# endif
# define hwloc_fls(x) fls(x)
# define HWLOC_NEED_FLSL
#elif defined(HWLOC_HAVE_CLZ)
# ifndef HWLOC_HAVE_DECL_CLZ
extern int clz(int) __hwloc_attribute_const;
# endif
# define hwloc_fls(x) (x ? 8*sizeof(int) - clz(x) : 0)
# define HWLOC_NEED_FLSL
#else /* no fls implementation */
static __hwloc_inline int __hwloc_attribute_const
hwloc_flsl(unsigned long x)
{
int i = 0;
if (!x)
return 0;
i = 1;
#if HWLOC_BITS_PER_LONG >= 64
if ((x & 0xffffffff00000000ul)) {
x >>= 32;
i += 32;
}
#endif
if ((x & 0xffff0000u)) {
x >>= 16;
i += 16;
}
if ((x & 0xff00)) {
x >>= 8;
i += 8;
}
if ((x & 0xf0)) {
x >>= 4;
i += 4;
}
if ((x & 0xc)) {
x >>= 2;
i += 2;
}
if ((x & 0x2)) {
x >>= 1;
i += 1;
}
return i;
}
#endif
#ifdef HWLOC_NEED_FLSL
/* We only have an int fls(int) implementation, build a long one. */
/* First make it 32 bits if it was only 16. */
static __hwloc_inline int __hwloc_attribute_const
hwloc_fls32(unsigned long x)
{
#if HWLOC_BITS_PER_INT == 16
int low_fls, hi_fls;
hi_fls = hwloc_fls(x >> 16);
if (hi_fls)
return hi_fls + 16;
low_fls = hwloc_fls(x & 0xfffful);
if (low_fls)
return low_fls;
return 0;
#else
return hwloc_fls(x);
#endif
}
/* Then make it 64 bit if longs are. */
static __hwloc_inline int __hwloc_attribute_const
hwloc_flsl(unsigned long x)
{
#if HWLOC_BITS_PER_LONG == 64
int low_fls, hi_fls;
hi_fls = hwloc_fls32(x >> 32);
if (hi_fls)
return hi_fls + 32;
low_fls = hwloc_fls32(x & 0xfffffffful);
if (low_fls)
return low_fls;
return 0;
#else
return hwloc_fls32(x);
#endif
}
#endif
static __hwloc_inline int __hwloc_attribute_const
hwloc_weight_long(unsigned long w)
{
#if HWLOC_BITS_PER_LONG == 32
#if (__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__) >= 4)
return __builtin_popcount(w);
#else
unsigned int res = (w & 0x55555555) + ((w >> 1) & 0x55555555);
res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
res = (res & 0x0F0F0F0F) + ((res >> 4) & 0x0F0F0F0F);
res = (res & 0x00FF00FF) + ((res >> 8) & 0x00FF00FF);
return (res & 0x0000FFFF) + ((res >> 16) & 0x0000FFFF);
#endif
#else /* HWLOC_BITS_PER_LONG == 32 */
#if (__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__) >= 4)
return __builtin_popcountll(w);
#else
unsigned long res;
res = (w & 0x5555555555555555ul) + ((w >> 1) & 0x5555555555555555ul);
res = (res & 0x3333333333333333ul) + ((res >> 2) & 0x3333333333333333ul);
res = (res & 0x0F0F0F0F0F0F0F0Ful) + ((res >> 4) & 0x0F0F0F0F0F0F0F0Ful);
res = (res & 0x00FF00FF00FF00FFul) + ((res >> 8) & 0x00FF00FF00FF00FFul);
res = (res & 0x0000FFFF0000FFFFul) + ((res >> 16) & 0x0000FFFF0000FFFFul);
return (res & 0x00000000FFFFFFFFul) + ((res >> 32) & 0x00000000FFFFFFFFul);
#endif
#endif /* HWLOC_BITS_PER_LONG == 64 */
}
#endif /* HWLOC_PRIVATE_MISC_H */
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