mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-19 09:20:07 +00:00
59 lines
1.7 KiB
ArmAsm
59 lines
1.7 KiB
ArmAsm
/* Multiply a limb vector by a single limb, for PowerPC.
|
|
Copyright (C) 1993-1995, 1997, 1999, 2000 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include <bp-sym.h>
|
|
#include <bp-asm.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 (BP_SYM (__mpn_submul_1))
|
|
#if __BOUNDED_POINTERS__
|
|
slwi r10,r5,2 /* convert limbs to bytes */
|
|
CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10)
|
|
CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10)
|
|
#endif
|
|
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 L(1)
|
|
|
|
L(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 L(0)
|
|
|
|
L(1): stw r8,4(r3)
|
|
addze r3,r10
|
|
blr
|
|
END (BP_SYM (__mpn_submul_1))
|