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locks; strict; comment @;; @; 1.1 date 2011.06.20.05.54.38; author mrg; state Exp; branches 1.1.1.1; next ; 1.1.1.1 date 2011.06.20.05.54.38; author mrg; state Exp; branches; next 1.1.1.2; 1.1.1.2 date 2017.08.22.09.40.49; author mrg; state Exp; branches; next ; commitid W5kmAIk8hwVpSb4A; desc @@ 1.1 log @Initial revision @ text @dnl IBM POWER mpn_sub_n -- Subtract two limb vectors of equal, non-zero dnl length. dnl Copyright 1992, 1994, 1995, 1996, 1999, 2000, 2001, 2005 Free Software dnl Foundation, Inc. dnl This file is part of the GNU MP Library. dnl The GNU MP Library is free software; you can redistribute it and/or modify dnl it under the terms of the GNU Lesser General Public License as published dnl by the Free Software Foundation; either version 3 of the License, or (at dnl your option) any later version. dnl The GNU MP Library is distributed in the hope that it will be useful, but dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public dnl License for more details. dnl You should have received a copy of the GNU Lesser General Public License dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. dnl INPUT PARAMETERS dnl res_ptr r3 dnl s1_ptr r4 dnl s2_ptr r5 dnl size r6 include(`../config.m4') ASM_START() PROLOGUE(mpn_sub_n) andil. 10,6,1 C odd or even number of limbs? l 8,0(4) C load least significant s1 limb l 0,0(5) C load least significant s2 limb cal 3,-4(3) C offset res_ptr, it's updated before it's used sri 10,6,1 C count for unrolled loop sf 7,0,8 C subtract least significant limbs, set cy mtctr 10 C copy count into CTR beq 0,Leven C branch if even # of limbs (# of limbs >= 2) C We have an odd # of limbs. Add the first limbs separately. cmpi 1,10,0 C is count for unrolled loop zero? bc 4,6,L1 C bne cr1,L1 (misassembled by gas) st 7,4(3) sfe 3,0,0 C load !cy into ... sfi 3,3,0 C ... return value register br C return C We added least significant limbs. Now reload the next limbs to enter loop. L1: lu 8,4(4) C load s1 limb and update s1_ptr lu 0,4(5) C load s2 limb and update s2_ptr stu 7,4(3) sfe 7,0,8 C subtract limbs, set cy Leven: lu 9,4(4) C load s1 limb and update s1_ptr lu 10,4(5) C load s2 limb and update s2_ptr bdz Lend C If done, skip loop Loop: lu 8,4(4) C load s1 limb and update s1_ptr lu 0,4(5) C load s2 limb and update s2_ptr sfe 11,10,9 C subtract previous limbs with cy, set cy stu 7,4(3) C lu 9,4(4) C load s1 limb and update s1_ptr lu 10,4(5) C load s2 limb and update s2_ptr sfe 7,0,8 C subtract previous limbs with cy, set cy stu 11,4(3) C bdn Loop C decrement CTR and loop back Lend: sfe 11,10,9 C subtract limbs with cy, set cy st 7,4(3) C st 11,8(3) C sfe 3,0,0 C load !cy into ... sfi 3,3,0 C ... return value register br EPILOGUE(mpn_sub_n) @ 1.1.1.1 log @initial import of GMP 5.0.2. GNU MP is a library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers. It has a rich set of functions, and the functions have a regular interface. GMP is necessary for GCC >= 4.2. @ text @@ 1.1.1.2 log @initial import of GMP 6.1.2. main changes from 5.1.3 below. notes: - support for thumb-less ARM chips was in our port of 5.1.3, but a similar method has been provided upstream now - someone should look at the AVX failure reports, and fix them Changes between GMP version 6.1.0 and 6.1.1 FEATURES * Work around faulty cpuid on some recent Intel chips (this allows GMP to run on Skylake Pentiums). * Support thumb-less ARM chips. Changes between GMP version 6.0.* and 6.1.0 BUGS FIXED * The public function mpn_com is now correctly declared in gmp.h. * Healed possible failures of mpn_sec_sqr for non-cryptographic sizes for some obsolete CPUs. * Various problems related to precision for mpf have been fixed. * Fixed ABI incompatible stack alignment in calls from assembly code. * Fixed PIC bug in popcount affecting Intel processors using the 32-bit ABI. SPEEDUPS * Speedup for Intel Broadwell and Skylake through assembly code making use of new ADX instructions. * Square root is now faster when the remainder is not needed. Also the speed to compute the k-th root improved, for small sizes. FEATURES * New C++ functions gcd and lcm for mpz_class. * New public mpn functions mpn_divexact_1, mpn_zero_p, and mpn_cnd_swap. * New public mpq_cmp_z function, to efficiently compare rationals with integers. * Support for more 32-bit arm processors. * Support for AVX-less modern x86 CPUs. (Such support might be missing either because the CPU vendor chose to disable AVX, or because the running kernel lacks AVX context switch support.) * Support for NetBSD under Xen; we switch off AVX unconditionally under NetBSD since a bug in NetBSD makes AVX fail under Xen. MISC * Tuned values for FFT multiplications are provided for larger number on many platforms. Changes between GMP version 5.1.* and 6.0.0 BUGS FIXED * The function mpz_invert now considers any number invertible in Z/1Z. * The mpn multiply code now handles operands of more than 2^31 limbs correctly. (Note however that the mpz code is limited to 2^32 bits on 32-bit hosts and 2^37 bits on 64-bit hosts.) SPEEDUPS * Plain division of large operands is faster and more monotonous in operand size. * Major speedup for ARM, in particular ARM Cortex-A15, thanks to improved assembly. * Speedup for Intel Sandy Bridge, Ivy Bridge, Haswell, thanks to rewritten and vastly expanded assembly support. Speedup also for the older Core 2 and Nehalem. * Faster mixed arithmetic between mpq_class and double. FEATURES * Support for new Intel and AMD CPUs. * New public functions mpn_sec_mul and mpn_sec_sqr, implementing side-channel silent multiplication and squaring. * New public functions mpn_sec_div_qr and mpn_sec_div_r, implementing side-channel silent division. * New public functions mpn_cnd_add_n and mpn_cnd_sub_n. Side-channel silent conditional addition and subtraction. * New public function mpn_sec_powm, implementing side-channel silent modexp. * New public function mpn_sec_invert, implementing side-channel silent modular inversion. * Better support for applications which use the mpz_t type, but nevertheless need to call some of the lower-level mpn functions. See the documentation for mpz_limbs_read and related functions. @ text @d4 2 a5 1 dnl Copyright 1992, 1994-1996, 1999-2001, 2005 Free Software Foundation, Inc. d8 1 a8 1 dnl d10 4 a13 14 dnl it under the terms of either: dnl dnl * the GNU Lesser General Public License as published by the Free dnl Software Foundation; either version 3 of the License, or (at your dnl option) any later version. dnl dnl or dnl dnl * the GNU General Public License as published by the Free Software dnl Foundation; either version 2 of the License, or (at your option) any dnl later version. dnl dnl or both in parallel, as here. dnl d16 5 a20 6 dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License dnl for more details. dnl dnl You should have received copies of the GNU General Public License and the dnl GNU Lesser General Public License along with the GNU MP Library. If not, dnl see https://www.gnu.org/licenses/. @