/usr/include/zn_poly/wide_arith.h is in libzn-poly-dev 0.9-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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wide_arith.h: double-word arithmetic
Copyright (C) 2007, 2008, David Harvey
This file is part of the zn_poly library (version 0.9).
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) version 3 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
============================================================================
NOTE: this file includes code adapted from GMP 4.2.1 and NTL 5.4.1. Please
see the file COPYING for further information about licensing of this code.
*/
/*
This file defines macros:
ZNP_MUL_HI(hi, a, b)
computes the high word of a * b, where a and b are unsigned longs.
ZNP_MUL_WIDE(hi, lo, a, b)
computes the high and low words of a * b, where a and b are unsigned
longs.
ZNP_ADD_WIDE(s1, s0, a1, a0, b1, b0)
computes B*s1 + s0 = (B*a1 + a0) + (B*b1 + b0), where all the
variables are unsigned longs. Carry is discarded.
ZNP_SUB_WIDE(s1, s0, a1, a0, b1, b0)
computes B*s1 + s0 = (B*a1 + a0) - (B*b1 + b0), where all the
variables are unsigned longs. Borrow is discarded.
If using gcc, there are several inline assembly implementations.
*/
#ifndef ZNP_WIDE_ARITH_H
#define ZNP_WIDE_ARITH_H
#include <limits.h>
#if ULONG_MAX == 4294967295U
#define UNSIGNED_LONG_BITS 32
#elif ULONG_MAX == 18446744073709551615U
#define UNSIGNED_LONG_BITS 64
#else
#error wide_arith requires that unsigned long is either 32 bits or 64 bits
#endif
#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 (UNSIGNED_LONG_BITS == 32)
#define ZNP_MUL_HI(hi, a, b) \
__asm__ ("mulhwu %0,%1,%2" : "=r" (hi) : "%r" (a), "r" (b));
#define ZNP_ADD_WIDE(s1, s0, a1, a0, b1, b0) \
do { \
if (__builtin_constant_p (b1) && (b1) == 0) \
__asm__ ("{a%I4|add%I4c} %1,%3,%4\n\t{aze|addze} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (a1), "%r" (a0), "rI" (b0)); \
else if (__builtin_constant_p (b1) && (b1) == ~(unsigned long) 0) \
__asm__ ("{a%I4|add%I4c} %1,%3,%4\n\t{ame|addme} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (a1), "%r" (a0), "rI" (b0)); \
else \
__asm__ ("{a%I5|add%I5c} %1,%4,%5\n\t{ae|adde} %0,%2,%3" \
: "=r" (s1), "=&r" (s0) \
: "r" (a1), "r" (b1), "%r" (a0), "rI" (b0)); \
} while (0)
#define ZNP_SUB_WIDE(s1, s0, a1, a0, b1, b0) \
do { \
if (__builtin_constant_p (a1) && (a1) == 0) \
__asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{sfze|subfze} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (b1), "rI" (a0), "r" (b0)); \
else if (__builtin_constant_p (a1) && (a1) == ~(unsigned long) 0) \
__asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{sfme|subfme} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (b1), "rI" (a0), "r" (b0)); \
else if (__builtin_constant_p (b1) && (b1) == 0) \
__asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{ame|addme} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (a1), "rI" (a0), "r" (b0)); \
else if (__builtin_constant_p (b1) && (b1) == ~(unsigned long) 0) \
__asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{aze|addze} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (a1), "rI" (a0), "r" (b0)); \
else \
__asm__ ("{sf%I4|subf%I4c} %1,%5,%4\n\t{sfe|subfe} %0,%3,%2" \
: "=r" (s1), "=&r" (s0) \
: "r" (a1), "r" (b1), "rI" (a0), "r" (b0)); \
} while (0)
#elif (UNSIGNED_LONG_BITS == 64)
#define ZNP_MUL_HI(hi, a, b) \
__asm__ ("mulhdu %0,%1,%2" : "=r" (hi) : "%r" (a), "r" (b));
#define ZNP_ADD_WIDE(s1, s0, a1, a0, b1, b0) \
do { \
if (__builtin_constant_p (b1) && (b1) == 0) \
__asm__ ("{a%I4|add%I4c} %1,%3,%4\n\t{aze|addze} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (a1), "%r" (a0), "rI" (b0)); \
else if (__builtin_constant_p (b1) && (b1) == ~(unsigned long) 0) \
__asm__ ("{a%I4|add%I4c} %1,%3,%4\n\t{ame|addme} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (a1), "%r" (a0), "rI" (b0)); \
else \
__asm__ ("{a%I5|add%I5c} %1,%4,%5\n\t{ae|adde} %0,%2,%3" \
: "=r" (s1), "=&r" (s0) \
: "r" (a1), "r" (b1), "%r" (a0), "rI" (b0)); \
} while (0)
#define ZNP_SUB_WIDE(s1, s0, a1, a0, b1, b0) \
do { \
if (__builtin_constant_p (a1) && (a1) == 0) \
__asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{sfze|subfze} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (b1), "rI" (a0), "r" (b0)); \
else if (__builtin_constant_p (a1) && (a1) == ~(unsigned long) 0) \
__asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{sfme|subfme} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (b1), "rI" (a0), "r" (b0)); \
else if (__builtin_constant_p (b1) && (b1) == 0) \
__asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{ame|addme} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (a1), "rI" (a0), "r" (b0)); \
else if (__builtin_constant_p (b1) && (b1) == ~(unsigned long) 0) \
__asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{aze|addze} %0,%2" \
: "=r" (s1), "=&r" (s0) : "r" (a1), "rI" (a0), "r" (b0)); \
else \
__asm__ ("{sf%I4|subf%I4c} %1,%5,%4\n\t{sfe|subfe} %0,%3,%2" \
: "=r" (s1), "=&r" (s0) \
: "r" (a1), "r" (b1), "rI" (a0), "r" (b0)); \
} while (0)
#endif
#endif
// ------ ALPHA ------
#if (defined (__alpha) && UNSIGNED_LONG_BITS == 64)
#define ZNP_MUL_HI(hi, a, b) \
__asm__ ("umulh %r1,%2,%0" : "=r" (hi) : "%rJ" (a), "rI" (b));
#endif
// ------ IA64 ------
#if (defined (__ia64) && UNSIGNED_LONG_BITS == 64)
#define ZNP_MUL_HI(hi, a, b) \
__asm__ ("xma.hu %0 = %1, %2, f0" : "=f" (hi) : "f" (a), "f" (b));
#endif
// ------ x86 ------
#if ((defined (__i386__) || defined (__i486__)) && UNSIGNED_LONG_BITS == 32)
#define ZNP_MUL_WIDE(hi, lo, a, b) \
__asm__ ("mull %3" : "=a" (lo), "=d" (hi) : "%0" (a), "rm" (b));
#define ZNP_ADD_WIDE(s1, s0, a1, a0, b1, b0) \
__asm__ ("addl %5,%k1\n\tadcl %3,%k0" \
: "=r" (s1), "=&r" (s0) \
: "0" ((unsigned long)(a1)), "g" ((unsigned long)(b1)), \
"%1" ((unsigned long)(a0)), "g" ((unsigned long)(b0)))
#define ZNP_SUB_WIDE(s1, s0, a1, a0, b1, b0) \
__asm__ ("subl %5,%k1\n\tsbbl %3,%k0" \
: "=r" (s1), "=&r" (s0) \
: "0" ((unsigned long)(a1)), "g" ((unsigned long)(b1)), \
"1" ((unsigned long)(a0)), "g" ((unsigned long)(b0)))
#endif
// ------ x86-64 ------
#if (defined (__x86_64__) && UNSIGNED_LONG_BITS == 64)
#define ZNP_MUL_WIDE(hi, lo, a, b) \
__asm__ ("mulq %3" : "=a" (lo), "=d" (hi) : "%0" (a), "rm" (b));
#define ZNP_ADD_WIDE(s1, s0, a1, a0, b1, b0) \
__asm__ ("addq %5,%q1\n\tadcq %3,%q0" \
: "=r" (s1), "=&r" (s0) \
: "0" ((unsigned long)(a1)), "rme" ((unsigned long)(b1)), \
"%1" ((unsigned long)(a0)), "rme" ((unsigned long)(b0)))
#define ZNP_SUB_WIDE(s1, s0, a1, a0, b1, b0) \
__asm__ ("subq %5,%q1\n\tsbbq %3,%q0" \
: "=r" (s1), "=&r" (s0) \
: "0" ((unsigned long)(a1)), "rme" ((unsigned long)(b1)), \
"1" ((unsigned long)(a0)), "rme" ((unsigned long)(b0)))
#endif
// -------- SPARC --------
#if (defined (__sparc__) && UNSIGNED_LONG_BITS == 32)
#if (defined (__sparc_v9__) || defined (__sparcv9) || \
defined (__sparc_v8__) || defined (__sparcv8) || defined (__sparclite__))
#define ZNP_MUL_WIDE(hi, lo, a, b) \
__asm__ ("umul %2,%3,%1;rd %%y,%0" \
: "=r" (hi), "=r" (lo) : "r" (a), "r" (b));
#endif
#endif
#endif // __GNUC__
// -------- generic implementations --------
/*
If neither ZNP_MUL_HI nor ZNP_MUL_WIDE has an assembly implementation,
do it in C.
(algorithm is from GMP's longlong.h)
*/
#if !(defined (ZNP_MUL_HI) || defined (ZNP_MUL_WIDE))
#warning No assembly implementation of wide multiplication available for this \
machine; using generic C code instead.
#define ZNP_MUL_WIDE(hi, lo, a, b) \
do { \
unsigned long __a = (a); \
unsigned long __b = (b); \
unsigned long __mask = (1UL << (UNSIGNED_LONG_BITS/2)) - 1; \
\
unsigned long __a0 = __a & __mask; \
unsigned long __a1 = __a >> (UNSIGNED_LONG_BITS/2); \
unsigned long __b0 = __b & __mask; \
unsigned long __b1 = __b >> (UNSIGNED_LONG_BITS/2); \
\
unsigned long __p00 = __a0 * __b0; \
unsigned long __p01 = __a0 * __b1; \
unsigned long __p10 = __a1 * __b0; \
unsigned long __p11 = __a1 * __b1; \
\
__p01 += (__p00 >> (UNSIGNED_LONG_BITS/2)); /* no possible carry */ \
__p01 += __p10; \
if (__p01 < __p10) \
__p11 += (1UL << (UNSIGNED_LONG_BITS/2)); /* propagate carry */ \
\
(hi) = __p11 + (__p01 >> (UNSIGNED_LONG_BITS/2)); \
(lo) = (__p00 & __mask) + (__p01 << (UNSIGNED_LONG_BITS/2)); \
} while (0)
#endif
/*
If only one of ZNP_MUL_HI and ZNP_MUL_WIDE is defined, define the other one
in terms of that one.
*/
#if defined (ZNP_MUL_HI) && !defined (ZNP_MUL_WIDE)
#define ZNP_MUL_WIDE(hi, lo, a, b) \
do { \
unsigned long __a = (a), __b = (b); \
ZNP_MUL_HI ((hi), __a, __b); \
(lo) = __a * __b; \
} while (0)
#endif
#if defined (ZNP_MUL_WIDE) && !defined (ZNP_MUL_HI)
#define ZNP_MUL_HI(hi, a, b) \
do { \
unsigned long __dummy; \
ZNP_MUL_WIDE ((hi), __dummy, (a), (b)); \
} while (0)
#endif
#if !defined (ZNP_ADD_WIDE)
#define ZNP_ADD_WIDE(s1, s0, a1, a0, b1, b0) \
do { \
unsigned long __a0 = (a0); \
unsigned long __temp = __a0 + (b0); \
(s1) = (a1) + (b1) + (__temp < __a0); \
(s0) = __temp; \
} while (0)
#endif
#if !defined (ZNP_SUB_WIDE)
#define ZNP_SUB_WIDE(s1, s0, a1, a0, b1, b0) \
do { \
unsigned long __a0 = (a0); \
unsigned long __b0 = (b0); \
unsigned long __temp = __a0 - __b0; \
(s1) = (a1) - (b1) - (__a0 < __b0); \
(s0) = __temp; \
} while (0)
#endif
#endif
// end of file ****************************************************************
|