| /* Shift a limb right, low level routine. |
| Copyright (C) 1995, 1997, 1999, 2000 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library 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. |
| |
| The GNU C Library 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 the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| #include <bp-sym.h> |
| #include <bp-asm.h> |
| |
| /* INPUT PARAMETERS |
| res_ptr r3 |
| s1_ptr r4 |
| size r5 |
| cnt r6 */ |
| |
| ENTRY (BP_SYM (__mpn_rshift)) |
| #if __BOUNDED_POINTERS__ |
| slwi r10,r5,2 /* convert limbs to bytes */ |
| CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10) |
| CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10) |
| #endif |
| mtctr r5 # copy size into CTR |
| addi r7,r3,-4 # move adjusted res_ptr to free return reg |
| subfic r8,r6,32 |
| lwz r11,0(r4) # load first s1 limb |
| slw r3,r11,r8 # compute function return value |
| bdz L(1) |
| |
| L(0): lwzu r10,4(r4) |
| srw r9,r11,r6 |
| slw r12,r10,r8 |
| or r9,r9,r12 |
| stwu r9,4(r7) |
| bdz L(2) |
| lwzu r11,4(r4) |
| srw r9,r10,r6 |
| slw r12,r11,r8 |
| or r9,r9,r12 |
| stwu r9,4(r7) |
| bdnz L(0) |
| |
| L(1): srw r0,r11,r6 |
| stw r0,4(r7) |
| blr |
| |
| L(2): srw r0,r10,r6 |
| stw r0,4(r7) |
| blr |
| END (BP_SYM (__mpn_rshift)) |
