mpir/mpn/x86_64/sub_n.as
2008-07-23 17:59:51 +00:00

56 lines
1.6 KiB
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; AMD64 mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
; store difference in a third limb vector.
;
; Copyright 2004 Free Software Foundation, Inc.
;
; This file is part of the GNU MP Library.
;
; The GNU MP 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 MP 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 MP Library; see the file COPYING.LIB. If not, write
; to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
; Boston, MA 02110-1301, USA.
;
; cycles/limb
; Hammer: 3.0
;
;
; INPUT PARAMETERS
; rp rdi
; up rsi
; vp rdx
; n rcx
%include '../yasm_mac.inc'
BITS 64
GLOBAL_FUNC mpn_sub_n
lea rsi, [rsi+rcx*8]
lea rdi, [rdi+rcx*8]
lea rdx, [rdx+rcx*8]
neg rcx
xor eax, eax ; clear cy
align 4 ; minimal alignment for claimed speed
loop1:
mov rax, [rsi+rcx*8]
mov r10, [rdx+rcx*8]
sbb rax, r10
mov [rdi+rcx*8], rax
inc rcx
jne loop1
mov rax, rcx ; zero rax
adc rax, rax
ret