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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.
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Copyright (C) 1997, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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/* mp_limb_t mpn_sub_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr,
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mp_size_t size)
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Calculate s1-s2 and put result in res_ptr; return borrow, 0 or 1. */
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/* Note on optimisation: This code is optimal for the 601. Almost every other
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possible 2-unrolled inner loop will not be. Also, watch out for the
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alignment... */
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EALIGN(__mpn_sub_n,3,1)
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/* Set up for loop below. */
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mtcrf 0x01,r6
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srwi. r7,r6,1
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mtctr r7
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bt 31,2f
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/* Set the carry (clear the borrow). */
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subfc r0,r0,r0
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/* Adjust pointers for loop. */
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addi r3,r3,-4
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addi r4,r4,-4
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addi r5,r5,-4
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b 0f
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2: lwz r7,0(r5)
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lwz r6,0(r4)
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subfc r6,r7,r6
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stw r6,0(r3)
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beq 1f
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/* Align start of loop to an odd word boundary to guarantee that the
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last two words can be fetched in one access (for 601). This turns
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out to be important. */
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0:
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lwz r9,4(r4)
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lwz r8,4(r5)
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lwzu r6,8(r4)
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lwzu r7,8(r5)
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subfe r8,r8,r9
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stw r8,4(r3)
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subfe r6,r7,r6
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stwu r6,8(r3)
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bdnz 0b
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/* Return the borrow. */
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1: subfe r3,r3,r3
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neg r3,r3
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blr
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END(__mpn_sub_n)
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