diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/sub_n.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/sub_n.S | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/sysdeps/powerpc/powerpc32/sub_n.S b/sysdeps/powerpc/powerpc32/sub_n.S deleted file mode 100644 index 659f348079..0000000000 --- a/sysdeps/powerpc/powerpc32/sub_n.S +++ /dev/null @@ -1,68 +0,0 @@ -/* Subtract two limb vectors of equal, non-zero length for PowerPC. - Copyright (C) 1997-2017 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, see - <http://www.gnu.org/licenses/>. */ - -#include <sysdep.h> - -/* mp_limb_t mpn_sub_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr, - mp_size_t size) - Calculate s1-s2 and put result in res_ptr; return borrow, 0 or 1. */ - -/* Note on optimisation: This code is optimal for the 601. Almost every other - possible 2-unrolled inner loop will not be. Also, watch out for the - alignment... */ - -EALIGN (__mpn_sub_n, 3, 1) - -/* Set up for loop below. */ - mtcrf 0x01,r6 - srwi. r7,r6,1 - mtctr r7 - bt 31,L(2) - -/* Set the carry (clear the borrow). */ - subfc r0,r0,r0 -/* Adjust pointers for loop. */ - addi r3,r3,-4 - addi r4,r4,-4 - addi r5,r5,-4 - b L(0) - -L(2): lwz r7,0(r5) - lwz r6,0(r4) - subfc r6,r7,r6 - stw r6,0(r3) - beq L(1) - -/* Align start of loop to an odd word boundary to guarantee that the - last two words can be fetched in one access (for 601). This turns - out to be important. */ -L(0): - lwz r9,4(r4) - lwz r8,4(r5) - lwzu r6,8(r4) - lwzu r7,8(r5) - subfe r8,r8,r9 - stw r8,4(r3) - subfe r6,r7,r6 - stwu r6,8(r3) - bdnz L(0) -/* Return the borrow. */ -L(1): subfe r3,r3,r3 - neg r3,r3 - blr -END (__mpn_sub_n) |