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Diffstat (limited to 'sysdeps/powerpc/submul_1.S')
| -rw-r--r-- | sysdeps/powerpc/submul_1.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/powerpc/submul_1.S b/sysdeps/powerpc/submul_1.S new file mode 100644 index 0000000000..80da8ec8c1 --- /dev/null +++ b/sysdeps/powerpc/submul_1.S @@ -0,0 +1,52 @@ +/* Multiply a limb vector by a single limb, for PowerPC. + Copyright (C) 1993, 1994, 1995, 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. */ + +#include <sysdep.h> + +/* mp_limb_t mpn_submul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr, + mp_size_t s1_size, mp_limb_t s2_limb) + Calculate res-s1*s2 and put result back in res; return carry. */ + +ENTRY(__mpn_submul_1) + mtctr %r5 + + lwz %r0,0(%r4) + mullw %r7,%r0,%r6 + mulhwu %r10,%r0,%r6 + lwz %r9,0(%r3) + subf %r8,%r7,%r9 + addc %r7,%r7,%r8 # invert cy (r7 is junk) + addi %r3,%r3,-4 # adjust res_ptr + bdz 1f + +0: lwzu %r0,4(%r4) + stwu %r8,4(%r3) + mullw %r8,%r0,%r6 + adde %r7,%r8,%r10 + mulhwu %r10,%r0,%r6 + lwz %r9,4(%r3) + addze %r10,%r10 + subf %r8,%r7,%r9 + addc %r7,%r7,%r8 # invert cy (r7 is junk) + bdnz 0b + +1: stw %r8,4(%r3) + addze %r3,%r10 + blr +END(__mpn_submul_1) |