mirror of
https://github.com/netwide-assembler/nasm.git
synced 2025-09-22 10:43:39 -04:00
cc147f79e4
There is no reason to not use an archive manager to build our executables. If there really are systems which don't have any kind of archive manager, we can simply link all the objects. This also drops any use of configure to detect library objects. Instead just use HAVE_* and let the archive manager delete them. A lot of additional functions could be declared library functions and reorganized. ***FIX*** Mkfiles/*.mak have not yet been updated. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
162 lines
3.7 KiB
C
162 lines
3.7 KiB
C
/* ----------------------------------------------------------------------- *
|
|
*
|
|
* Copyright 1996-2016 The NASM Authors - All Rights Reserved
|
|
* See the file AUTHORS included with the NASM distribution for
|
|
* the specific copyright holders.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
|
|
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
|
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
#include "compiler.h"
|
|
#include "nasmlib.h"
|
|
|
|
#define ROUND(v, a, w) \
|
|
do { \
|
|
if (v & (((1 << w) - 1) << w)) { \
|
|
a += w; \
|
|
v >>= w; \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
#if defined(__GNUC__) && defined(__x86_64__)
|
|
|
|
int ilog2_32(uint32_t v)
|
|
{
|
|
int n;
|
|
|
|
__asm__("bsrl %1,%0"
|
|
: "=r" (n)
|
|
: "rm" (v), "0" (0));
|
|
return n;
|
|
}
|
|
|
|
#elif defined(__GNUC__) && defined(__i386__)
|
|
|
|
int ilog2_32(uint32_t v)
|
|
{
|
|
int n;
|
|
|
|
__asm__("bsrl %1,%0 ; jnz 1f ; xorl %0,%0\n"
|
|
"1:"
|
|
: "=&r" (n)
|
|
: "rm" (v));
|
|
return n;
|
|
}
|
|
|
|
#elif defined(HAVE___BUILTIN_CTZ) && INT_MAX >= 2147483647
|
|
|
|
int ilog2_32(uint32_t v)
|
|
{
|
|
if (!v)
|
|
return 0;
|
|
|
|
return __builtin_clz(v) ^ 31;
|
|
}
|
|
|
|
#else
|
|
|
|
int ilog2_32(uint32_t v)
|
|
{
|
|
int p = 0;
|
|
|
|
ROUND(v, p, 16);
|
|
ROUND(v, p, 8);
|
|
ROUND(v, p, 4);
|
|
ROUND(v, p, 2);
|
|
ROUND(v, p, 1);
|
|
|
|
return p;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if defined(__GNUC__) && defined(__x86_64__)
|
|
|
|
int ilog2_64(uint64_t v)
|
|
{
|
|
uint64_t n;
|
|
|
|
__asm__("bsrq %1,%0"
|
|
: "=r" (n)
|
|
: "rm" (v), "0" (UINT64_C(0)));
|
|
return n;
|
|
}
|
|
|
|
#elif defined(HAVE__BUILTIN_CTZLL) && LLONG_MAX >= 9223372036854775807L
|
|
|
|
int ilog2_64(uint64_t v)
|
|
{
|
|
if (!v)
|
|
return 0;
|
|
|
|
return __builtin_clzll(v) ^ 63;
|
|
}
|
|
|
|
#else
|
|
|
|
int ilog2_64(uint64_t vv)
|
|
{
|
|
int p = 0;
|
|
uint32_t v;
|
|
|
|
v = vv >> 32;
|
|
if (v)
|
|
p += 32;
|
|
else
|
|
v = vv;
|
|
|
|
ROUND(v, p, 16);
|
|
ROUND(v, p, 8);
|
|
ROUND(v, p, 4);
|
|
ROUND(v, p, 2);
|
|
ROUND(v, p, 1);
|
|
|
|
return p;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* v == 0 ? 0 : is_power2(x) ? ilog2_X(v) : -1
|
|
*/
|
|
int alignlog2_32(uint32_t v)
|
|
{
|
|
if (unlikely(v & (v-1)))
|
|
return -1; /* invalid alignment */
|
|
|
|
return ilog2_32(v);
|
|
}
|
|
|
|
int alignlog2_64(uint64_t v)
|
|
{
|
|
if (unlikely(v & (v-1)))
|
|
return -1; /* invalid alignment */
|
|
|
|
return ilog2_64(v);
|
|
}
|