diff options
Diffstat (limited to 'sysdeps/powerpc/sub_n.s')
| -rw-r--r-- | sysdeps/powerpc/sub_n.s | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/sysdeps/powerpc/sub_n.s b/sysdeps/powerpc/sub_n.s deleted file mode 100644 index 8711bf9a40..0000000000 --- a/sysdeps/powerpc/sub_n.s +++ /dev/null @@ -1,69 +0,0 @@ - # Subtract two limb vectors of equal, non-zero length for PowerPC. - # Copyright (C) 1997 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 Library General Public License as - # published by the Free Software Foundation; either version 2 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 - # Library General Public License for more details. - # - # You should have received a copy of the GNU Library General Public - # License along with the GNU C Library; see the file COPYING.LIB. If not, - # write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - # Boston, MA 02111-1307, USA. - - # 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... - - .align 3 - .globl __mpn_sub_n - .type __mpn_sub_n,@function - nop -__mpn_sub_n: - # Set up for loop below. - mtcrf 0x01,%r6 - srwi. %r7,%r6,1 - mtctr %r7 - bt 31,2f - - # 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 0f - -2: lwz %r7,0(%r5) - lwz %r6,0(%r4) - subfc %r6,%r7,%r6 - stw %r6,0(%r3) - beq 1f - - # 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. -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 0b - # return the borrow -1: subfe %r3,%r3,%r3 - neg %r3,%r3 - blr |