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locks; strict; comment @;; @; 1.1 date 2011.06.20.05.54.40; author mrg; state Exp; branches 1.1.1.1; next ; 1.1.1.1 date 2011.06.20.05.54.40; 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 mc68020 mpn_rshift -- mpn right shift. dnl Copyright 1996, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, dnl Inc. dnl dnl This file is part of the GNU MP Library. dnl dnl The GNU MP Library is free software; you can redistribute it and/or dnl modify it under the terms of the GNU Lesser General Public License as dnl published by the Free Software Foundation; either version 3 of the dnl License, or (at your option) any later version. dnl dnl The GNU MP Library is distributed in the hope that it will be useful, dnl but WITHOUT ANY WARRANTY; without even the implied warranty of dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU dnl Lesser General Public License for more details. dnl 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/. include(`../config.m4') C cycles/limb C shift==1 shift>1 C 68040: 9 12 C mp_limb_t mpn_rshift (mp_ptr res_ptr, mp_srcptr s_ptr, mp_size_t s_size, C unsigned cnt); C C The "cnt" parameter is either 16 bits or 32 bits depending on C SIZEOF_UNSIGNED (see ABI notes in mpn/m68k/README). The value is of C course only 1 to 31. When loaded as 16 bits there's garbage in the upper C half, hence the use of cmpw. The shift instructions take the their count C modulo 64, so the upper part doesn't matter to them either. C C INPUT PARAMETERS C res_ptr (sp + 4) C s_ptr (sp + 8) C s_size (sp + 12) C cnt (sp + 16) define(res_ptr, `a1') define(s_ptr, `a0') define(s_size, `d6') define(cnt, `d4') ifdef(`SIZEOF_UNSIGNED',, `m4_error(`SIZEOF_UNSIGNED not defined, should be in config.m4 ')') PROLOGUE(mpn_rshift) C Save used registers on the stack. moveml d2-d6/a2, M(-,sp) C Copy the arguments to registers. movel M(sp,28), res_ptr movel M(sp,32), s_ptr movel M(sp,36), s_size ifelse(SIZEOF_UNSIGNED,2, ` movew M(sp,40), cnt', ` movel M(sp,40), cnt') moveql #1, d5 cmpw d5, cnt bne L(Lnormal) cmpl res_ptr, s_ptr bls L(Lspecial) C jump if res_ptr >= s_ptr ifelse(scale_available_p,1,` lea M(res_ptr,s_size,l,4), a2 ',` movel s_size, d0 asll #2, d0 lea M(res_ptr,d0,l), a2 ') cmpl s_ptr, a2 bls L(Lspecial) C jump if s_ptr >= res_ptr + s_size L(Lnormal:) moveql #32, d5 subl cnt, d5 movel M(s_ptr,+), d2 movel d2, d0 lsll d5, d0 C compute carry limb lsrl cnt, d2 movel d2, d1 subql #1, s_size beq L(Lend) lsrl #1, s_size bcs L(L1) subql #1, s_size L(Loop:) movel M(s_ptr,+), d2 movel d2, d3 lsll d5, d3 orl d3, d1 movel d1, M(res_ptr,+) lsrl cnt, d2 L(L1:) movel M(s_ptr,+), d1 movel d1, d3 lsll d5, d3 orl d3, d2 movel d2, M(res_ptr,+) lsrl cnt, d1 dbf s_size, L(Loop) subl #0x10000, s_size bcc L(Loop) L(Lend:) movel d1, M(res_ptr) C store most significant limb C Restore used registers from stack frame. moveml M(sp,+), d2-d6/a2 rts C We loop from most significant end of the arrays, which is only permissable C if the source and destination don't overlap, since the function is C documented to work for overlapping source and destination. L(Lspecial:) ifelse(scale_available_p,1,` lea M(s_ptr,s_size,l,4), s_ptr lea M(res_ptr,s_size,l,4), res_ptr ',` movel s_size, d0 asll #2, d0 addl d0, s_ptr addl d0, res_ptr ') clrl d0 C initialize carry eorw #1, s_size lsrl #1, s_size bcc L(LL1) subql #1, s_size L(LLoop:) movel M(-,s_ptr), d2 roxrl #1, d2 movel d2, M(-,res_ptr) L(LL1:) movel M(-,s_ptr), d2 roxrl #1, d2 movel d2, M(-,res_ptr) dbf s_size, L(LLoop) roxrl #1, d0 C save cy in msb subl #0x10000, s_size bcs L(LLend) addl d0, d0 C restore cy bra L(LLoop) L(LLend:) C Restore used registers from stack frame. moveml M(sp,+), d2-d6/a2 rts EPILOGUE(mpn_rshift) @ 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 @d3 3 a5 2 dnl Copyright 1996, 1999-2003 Free Software Foundation, Inc. d8 9 a16 19 dnl The GNU MP Library is free software; you can redistribute it and/or modify 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 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 General Public License dnl for more details. d18 2 a19 3 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/. d82 1 a82 1 L(Lnormal): d97 1 a97 1 L(Loop): d104 1 a104 1 L(L1): d116 1 a116 1 L(Lend): d127 1 a127 1 L(Lspecial): d144 1 a144 1 L(LLoop): d148 1 a148 1 L(LL1): d160 1 a160 1 L(LLend): @