/usr/include/NTL/SPMM_ASM.h is in libntl-dev 9.9.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Assembly code support for computing the high-order
word of a word * word product (unsigned).
Note that these typically only make a significant difference
on some 64-bit machines, as on 32-bit machines, the "long long"
solution is usually just as good.
These code sequences were extracted from a recent version of
the file longlong.h from gmp. Copyright notice follows:
Copyright 1991, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2002, 2003
Free Software Foundation, Inc.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this file; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA.
*************************************************************/
#if (defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)))
// To simplify things, we require gcc v2.7 or higher.
// ------ POWERPC ------
#if defined (_ARCH_PPC) || defined (__powerpc__) || defined (__POWERPC__) \
|| defined (__ppc__) || defined(__ppc64__) \
|| (defined (PPC) && ! defined (CPU_FAMILY)) /* gcc 2.7.x GNU&SysV */ \
|| (defined (PPC) && defined (CPU_FAMILY) /* VxWorks */ \
&& CPU_FAMILY == PPC)
#if (NTL_BITS_PER_LONG == 32)
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
unsigned long hi;
__asm__ ("mulhwu %0,%1,%2" : "=r" (hi) : "%r" (a), "r" (b));
return hi;
}
#elif (NTL_BITS_PER_LONG == 64)
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
unsigned long hi;
__asm__ ("mulhdu %0,%1,%2" : "=r" (hi) : "%r" (a), "r" (b));
return hi;
}
#endif
#endif
// ------ ALPHA ------
#if (defined (__alpha) && NTL_BITS_PER_LONG == 64)
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
unsigned long hi;
__asm__ ("umulh %r1,%2,%0" : "=r" (hi) : "%rJ" (a), "rI" (b));
return hi;
}
#endif
// ------ IA64 ------
#if (defined (__ia64) && NTL_BITS_PER_LONG == 64)
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
unsigned long hi;
__asm__ ("xma.hu %0 = %1, %2, f0" : "=f" (hi) : "f" (a), "f" (b));
return hi;
}
#endif
// ------ x86 ------
#if ((defined (__i386__) || defined (__i486__)) && NTL_BITS_PER_LONG == 32)
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
unsigned long hi, lo;
__asm__ ("mull %3" : "=a" (lo), "=d" (hi) : "%0" (a), "rm" (b));
return hi;
}
#endif
// ------ x86-64 ------
#if (defined (__x86_64__) && NTL_BITS_PER_LONG == 64)
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
unsigned long hi, lo;
__asm__ ("mulq %3" : "=a" (lo), "=d" (hi) : "%0" (a), "rm" (b));
//__asm__ ("mulxq %2,%1,%0" : "=r" (hi), "=r" (lo) : "rm" (a), "d" (b));
// this uses the mulx instruction - no real benefit
return hi;
}
#endif
// ------ MIPS ------
#if (defined (__mips))
#if (NTL_BITS_PER_LONG == 32)
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
unsigned long hi;
hi = ((unsigned long long) a * b) >> 32;
return hi;
}
#elif (NTL_BITS_PER_LONG == 64)
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
typedef unsigned int uint128_t __attribute__((mode(TI)));
unsigned long hi;
hi = ((uint128_t) a * b) >> 64;
return hi;
}
#endif
#endif
// -------- SPARC --------
#if (defined (__sparc__) && NTL_BITS_PER_LONG == 32)
#if (defined (__sparc_v9__) || defined (__sparcv9) || \
defined (__sparc_v8__) || defined (__sparcv8) || defined (__sparclite__))
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
unsigned long hi, lo;
__asm__ ("umul %2,%3,%1;rd %%y,%0" : "=r" (hi), "=r" (lo) : "r" (a), "r" (b));
return hi;
}
#endif
#endif
#endif // __GNUC__
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