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tlsf: remove unused stuff from tlsfbits.h 

Also, as this file is locally used by the tlsf implementation,
move this file to common.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2011-12-23 01:11:55 +01:00
parent 5d96cda944
commit c09fdea2c0
2 changed files with 55 additions and 180 deletions
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55
common/tlsfbits.h Normal file
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@ -0,0 +1,55 @@
#ifndef INCLUDED_tlsfbits
#define INCLUDED_tlsfbits
#include <linux/bitops.h>
/*
** Architecture-specific bit manipulation routines.
**
** TLSF achieves O(1) cost for malloc and free operations by limiting
** the search for a free block to a free list of guaranteed size
** adequate to fulfill the request, combined with efficient free list
** queries using bitmasks and architecture-specific bit-manipulation
** routines.
**
** Most modern processors provide instructions to count leading zeroes
** in a word, find the lowest and highest set bit, etc. These
** specific implementations will be used when available, falling back
** to a reasonably efficient generic implementation.
**
** NOTE: TLSF spec relies on ffs/fls returning value 0..31.
** ffs/fls return 1-32 by default, returning 0 for error.
*/
static int tlsf_ffs(unsigned int word)
{
return ffs(word) - 1;
}
static int tlsf_fls(unsigned int word)
{
return fls(word) - 1;
}
/* Possibly 64-bit version of tlsf_fls. */
#if defined (TLSF_64BIT)
tlsf_decl int tlsf_fls_sizet(size_t size)
{
int high = (int)(size >> 32);
int bits = 0;
if (high)
{
bits = 32 + tlsf_fls(high);
}
else
{
bits = tlsf_fls((int)size & 0xffffffff);
}
return bits;
}
#else
#define tlsf_fls_sizet tlsf_fls
#endif
#endif

180
include/tlsfbits.h
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@ -1,180 +0,0 @@
#ifndef INCLUDED_tlsfbits
#define INCLUDED_tlsfbits
#if defined(__cplusplus)
#define tlsf_decl inline
#else
#define tlsf_decl static
#endif
/*
** Architecture-specific bit manipulation routines.
**
** TLSF achieves O(1) cost for malloc and free operations by limiting
** the search for a free block to a free list of guaranteed size
** adequate to fulfill the request, combined with efficient free list
** queries using bitmasks and architecture-specific bit-manipulation
** routines.
**
** Most modern processors provide instructions to count leading zeroes
** in a word, find the lowest and highest set bit, etc. These
** specific implementations will be used when available, falling back
** to a reasonably efficient generic implementation.
**
** NOTE: TLSF spec relies on ffs/fls returning value 0..31.
** ffs/fls return 1-32 by default, returning 0 for error.
*/
/*
** Detect whether or not we are building for a 32- or 64-bit (LP/LLP)
** architecture. There is no reliable portable method at compile-time.
*/
#if defined (__alpha__) || defined (__ia64__) || defined (__x86_64__) \
|| defined (_WIN64) || defined (__LP64__) || defined (__LLP64__)
#define TLSF_64BIT
#endif
/*
** gcc 3.4 and above have builtin support, specialized for architecture.
** Some compilers masquerade as gcc; patchlevel test filters them out.
*/
#if defined (__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) \
&& defined (__GNUC_PATCHLEVEL__)
tlsf_decl int tlsf_ffs(unsigned int word)
{
return __builtin_ffs(word) - 1;
}
tlsf_decl int tlsf_fls(unsigned int word)
{
const int bit = word ? 32 - __builtin_clz(word) : 0;
return bit - 1;
}
#elif defined (_MSC_VER) && defined (_M_IX86) && (_MSC_VER >= 1400)
/* Microsoft Visual C++ 2005 support on x86 architectures. */
#include <intrin.h>
#pragma intrinsic(_BitScanReverse)
#pragma intrinsic(_BitScanForward)
tlsf_decl int tlsf_fls(unsigned int word)
{
unsigned long index;
return _BitScanReverse(&index, word) ? index : -1;
}
tlsf_decl int tlsf_ffs(unsigned int word)
{
unsigned long index;
return _BitScanForward(&index, word) ? index : -1;
}
#elif defined (_MSC_VER) && defined (_M_PPC)
/* Microsoft Visual C++ support on PowerPC architectures. */
#include <ppcintrinsics.h>
tlsf_decl int tlsf_fls(unsigned int word)
{
const int bit = 32 - _CountLeadingZeros(word);
return bit - 1;
}
tlsf_decl int tlsf_ffs(unsigned int word)
{
const unsigned int reverse = word & (~word + 1);
const int bit = 32 - _CountLeadingZeros(reverse);
return bit - 1;
}
#elif defined (__ARMCC_VERSION)
/* RealView Compilation Tools for ARM */
tlsf_decl int tlsf_ffs(unsigned int word)
{
const unsigned int reverse = word & (~word + 1);
const int bit = 32 - __clz(reverse);
return bit - 1;
}
tlsf_decl int tlsf_fls(unsigned int word)
{
const int bit = word ? 32 - __clz(word) : 0;
return bit - 1;
}
#elif defined (__ghs__)
/* Green Hills support for PowerPC */
#include <ppc_ghs.h>
tlsf_decl int tlsf_ffs(unsigned int word)
{
const unsigned int reverse = word & (~word + 1);
const int bit = 32 - __CLZ32(reverse);
return bit - 1;
}
tlsf_decl int tlsf_fls(unsigned int word)
{
const int bit = word ? 32 - __CLZ32(word) : 0;
return bit - 1;
}
#else
/* Fall back to generic implementation. */
tlsf_decl int tlsf_fls_generic(unsigned int word)
{
int bit = 32;
if (!word) bit -= 1;
if (!(word & 0xffff0000)) { word <<= 16; bit -= 16; }
if (!(word & 0xff000000)) { word <<= 8; bit -= 8; }
if (!(word & 0xf0000000)) { word <<= 4; bit -= 4; }
if (!(word & 0xc0000000)) { word <<= 2; bit -= 2; }
if (!(word & 0x80000000)) { word <<= 1; bit -= 1; }
return bit;
}
/* Implement ffs in terms of fls. */
tlsf_decl int tlsf_ffs(unsigned int word)
{
return tlsf_fls_generic(word & (~word + 1)) - 1;
}
tlsf_decl int tlsf_fls(unsigned int word)
{
return tlsf_fls_generic(word) - 1;
}
#endif
/* Possibly 64-bit version of tlsf_fls. */
#if defined (TLSF_64BIT)
tlsf_decl int tlsf_fls_sizet(size_t size)
{
int high = (int)(size >> 32);
int bits = 0;
if (high)
{
bits = 32 + tlsf_fls(high);
}
else
{
bits = tlsf_fls((int)size & 0xffffffff);
}
return bits;
}
#else
#define tlsf_fls_sizet tlsf_fls
#endif
#undef tlsf_decl
#endif