mpir/mpn/x86_64w/amd64/addsub_n.asm

99 lines
2.5 KiB
NASM

; AMD64 mpn_addsub_n
; Verdxon 1.0.4
;
; Copyright 2008 Jason Moxham
;
; Windows Converdxon Copyright 2008 Brian Gladman
;
; This file is part of the MPIR Library.
; The MPIR 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 verdxon 2.1 of the License, or (at
; your option) any later verdxon.
; The MPIR 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 MPIR 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.
;
; Calling interface (GCC):
;
; rcx[rbx] = rdx[rbx] + r8[rbx] - r9[rbx]
;
; return carry - borrow
;
; mp_limb_t __gmpn_addsub_n(
; mp_ptr dp, rcx
; mp_srcptr sp1, rdx
; mp_srcptr sp2, r8
; mp_size_t sp3, r9
; mp_size_t n [rsp+0x28] -> rbxd
; )
;
; This is an SEH frame function
%include "..\yasm_mac.inc"
%define reg_save_list rbx, rbp, rsi, rdi
BITS 64
FRAME_PROC mpn_addsub_n, 0, reg_save_list
mov ebx, dword [rsp+stack_use+40]
lea rdx, [rdx+rbx*8]
lea r8, [r8+rbx*8]
lea rcx, [rcx+rbx*8]
lea r9, [r9+rbx*8]
neg rbx
xor rax, rax
xor rsi, rsi
test rbx, 3
jz .2
.1: mov rdi, [r8+rbx*8]
add rax, 1
sbb rdi, [r9+rbx*8]
sbb rax, rax
add rsi, 1
adc rdi, [rdx+rbx*8]
sbb rsi, rsi
mov [rcx+rbx*8], rdi
inc rbx
test rbx, 3
jnz .1
.2: cmp rbx, 0
jz .4
alignb 16, nop
.3: add rax, 1
mov rdi, [r8+rbx*8]
mov rbp, [r8+rbx*8+8]
mov r10, [r8+rbx*8+16]
mov r11, [r8+rbx*8+24]
sbb rdi, [r9+rbx*8]
sbb rbp, [r9+rbx*8+8]
sbb r10, [r9+rbx*8+16]
sbb r11, [r9+rbx*8+24]
sbb rax, rax
add rsi, 1
adc rdi, [rdx+rbx*8]
adc rbp, [rdx+rbx*8+8]
adc r10, [rdx+rbx*8+16]
adc r11, [rdx+rbx*8+24]
mov [rcx+rbx*8], rdi
mov [rcx+rbx*8+8], rbp
mov [rcx+rbx*8+16], r10
mov [rcx+rbx*8+24], r11
sbb rsi, rsi
add rbx, 4
jnz .3
.4: sub rax, rsi
END_PROC reg_save_list
end