mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
217eb19b6f
1999-10-11 Ulrich Drepper <drepper@cygnus.com> * sysdeps/powerpc/Makefile [math] (libm-support): Remove t_sqrt. * sysdeps/powerpc/e_sqrt.c: Moved to... * sysdeps/powerpc/fpu/e_sqrt.c: ...here. * sysdeps/powerpc/e_sqrtf.c: Moved to... * sysdeps/powerpc/fpu/e_sqrtf.c: ...here. * sysdeps/powerpc/submul_1.S: Adjust asm syntax. * sysdeps/powerpc/sub_n.S: Likewise. * sysdeps/powerpc/strlen.S: Likewise. * sysdeps/powerpc/strcpy.S: Likewise. * sysdeps/powerpc/strcmp.S: Likewise. * sysdeps/powerpc/strchr.S: Likewise. * sysdeps/powerpc/stpcpy.S: Likewise. * sysdeps/powerpc/setjmp.S: Likewise. * sysdeps/powerpc/rshift.S: Likewise. * sysdeps/powerpc/ppc-mcount.S: Likewise. * sysdeps/powerpc/mul_1.S: Likewise. * sysdeps/powerpc/memset.S: Likewise. * sysdeps/powerpc/lshift.S: Likewise. * sysdeps/powerpc/dl-start.S: Likewise. * sysdeps/powerpc/bzero.S: Likewise. * sysdeps/powerpc/bsd-setjmp.S: Likewise. * sysdeps/powerpc/bsd-_setjmp.S: Likewise. * sysdeps/powerpc/addmul_1.S: Likewise. * sysdeps/powerpc/add_n.S: Likewise. * sysdeps/powerpc/__longjmp.S: Likewise. * sysdeps/powerpc/elf/start.S: Likewise. 1999-10-11 Cristian Gafton <gafton@redhat.com> * sysdeps/unix/sysv/linux/alpha/bits/sigaction.h: Declare
69 lines
2.0 KiB
ArmAsm
69 lines
2.0 KiB
ArmAsm
/* Subtract two limb vectors of equal, non-zero length for PowerPC.
|
|
Copyright (C) 1997, 1999 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. */
|
|
|
|
#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 31,2f
|
|
|
|
/* 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
|
|
END(__mpn_sub_n)
|