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-rw-r--r--sysdeps/powerpc/sub_n.s69
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diff --git a/sysdeps/powerpc/sub_n.s b/sysdeps/powerpc/sub_n.s
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- # 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