1/* Multiply a limb vector by a single limb, for PowerPC. 2 Copyright (C) 1993-1995, 1997, 1999, 2000 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20#include <sysdep.h> 21#include <bp-sym.h> 22#include <bp-asm.h> 23 24/* mp_limb_t mpn_submul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr, 25 mp_size_t s1_size, mp_limb_t s2_limb) 26 Calculate res-s1*s2 and put result back in res; return carry. */ 27 28ENTRY (BP_SYM (__mpn_submul_1)) 29#if __BOUNDED_POINTERS__ 30 slwi r10,r5,2 /* convert limbs to bytes */ 31 CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10) 32 CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10) 33#endif 34 mtctr r5 35 36 lwz r0,0(r4) 37 mullw r7,r0,r6 38 mulhwu r10,r0,r6 39 lwz r9,0(r3) 40 subf r8,r7,r9 41 addc r7,r7,r8 # invert cy (r7 is junk) 42 addi r3,r3,-4 # adjust res_ptr 43 bdz L(1) 44 45L(0): lwzu r0,4(r4) 46 stwu r8,4(r3) 47 mullw r8,r0,r6 48 adde r7,r8,r10 49 mulhwu r10,r0,r6 50 lwz r9,4(r3) 51 addze r10,r10 52 subf r8,r7,r9 53 addc r7,r7,r8 # invert cy (r7 is junk) 54 bdnz L(0) 55 56L(1): stw r8,4(r3) 57 addze r3,r10 58 blr 59END (BP_SYM (__mpn_submul_1)) 60