225 lines
4.8 KiB
NASM
225 lines
4.8 KiB
NASM
|
|
; Copyright 1999, 2000, 2001, 2002 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., 59 Temple Place -
|
|
; Suite 330, Boston, MA 02111-1307, USA.
|
|
;
|
|
; Translation of AT&T syntax code by Brian Gladman
|
|
|
|
%include "..\x86i.inc"
|
|
|
|
%define UNROLL_LOG2 4
|
|
%define UNROLL_COUNT (1 << UNROLL_LOG2)
|
|
%define UNROLL_MASK UNROLL_COUNT-1
|
|
%define UNROLL_BYTES 4*UNROLL_COUNT
|
|
|
|
%ifdef PIC
|
|
%define UNROLL_THRESHOLD 5
|
|
%else
|
|
%define UNROLL_THRESHOLD 5
|
|
%endif
|
|
|
|
%define PARAM_CARRY esp+frame+20
|
|
%define PARAM_MULTIPLIER esp+frame+16
|
|
%define PARAM_SIZE esp+frame+12
|
|
%define PARAM_SRC esp+frame+8
|
|
%define PARAM_DST esp+frame+4
|
|
|
|
%macro mul_fun 4
|
|
|
|
%ifdef DLL
|
|
export %1%3
|
|
export %1%4
|
|
%endif
|
|
|
|
align 32
|
|
%define frame 0
|
|
%1%4:
|
|
FR_push ebx
|
|
mov ebx,[PARAM_CARRY]
|
|
jmp %%Lstart_nc
|
|
|
|
%define frame 0
|
|
%1%3:
|
|
FR_push ebx
|
|
xor ebx,ebx ; initial carry
|
|
%%Lstart_nc:
|
|
mov ecx,[PARAM_SIZE]
|
|
FR_push esi
|
|
mov esi,[PARAM_SRC]
|
|
FR_push edi
|
|
mov edi,[PARAM_DST]
|
|
FR_push ebp
|
|
cmp ecx,UNROLL_THRESHOLD
|
|
mov ebp,[PARAM_MULTIPLIER]
|
|
jae %%Lunroll
|
|
|
|
; simple loop
|
|
; this is offset 0x22,so close enough to aligned
|
|
; eax scratch
|
|
; ebx carry
|
|
; ecx counter
|
|
; edx scratch
|
|
; esi src
|
|
; edi dst
|
|
; ebp multiplier
|
|
|
|
%%Lsimple:
|
|
mov eax,[esi]
|
|
add edi,4
|
|
mul ebp
|
|
add eax,ebx
|
|
adc edx,0
|
|
%2 [edi-4],eax
|
|
mov ebx,edx
|
|
adc ebx,0
|
|
dec ecx
|
|
lea esi,[4+esi]
|
|
jnz %%Lsimple
|
|
pop ebp
|
|
pop edi
|
|
pop esi
|
|
mov eax,ebx
|
|
pop ebx
|
|
ret
|
|
|
|
; VAR_JUMP holds the computed jump temporarily because there's not enough
|
|
; registers when doing the mul for the initial two carry limbs.
|
|
;
|
|
; The add/adc for the initial carry in %ebx is necessary only for the
|
|
; mpn_add/submul_1c entry points. Duplicating the startup code to
|
|
; eliminiate this for the plain mpn_add/submul_1 doesn't seem like a good
|
|
; idea.
|
|
;
|
|
; overlapping with parameters already fetched
|
|
|
|
%define VAR_COUNTER PARAM_SIZE
|
|
%define VAR_JUMP PARAM_DST
|
|
|
|
; VAL1 = ifelse(UNROLL_BYTES,256,128)
|
|
%define VAL1 128
|
|
; VAL2 = ifelse(UNROLL_BYTES,256,-128)
|
|
%define VAL2 -128
|
|
|
|
; this is offset 0x43,so close enough to aligned
|
|
; eax
|
|
; ebx initial carry
|
|
; ecx size
|
|
; edx
|
|
; esi src
|
|
; edi dst
|
|
; ebp
|
|
|
|
%%Lunroll:
|
|
mov edx,ecx
|
|
dec ecx
|
|
sub edx,2
|
|
neg ecx
|
|
shr edx,UNROLL_LOG2
|
|
and ecx,UNROLL_MASK
|
|
mov [VAR_COUNTER],edx
|
|
mov edx,ecx
|
|
|
|
; 15 code bytes per limb
|
|
|
|
%ifdef PIC
|
|
call %%Lhere
|
|
%%Lhere:
|
|
shl edx,4
|
|
neg ecx
|
|
lea edx,[edx+ecx*1]
|
|
add edx,%%Lentry-%%Lhere
|
|
add edx,[esp]
|
|
add esp,4
|
|
%else
|
|
shl edx,4
|
|
neg ecx
|
|
lea edx,[%%Lentry+edx+ecx]
|
|
%endif
|
|
mov eax,[esi] ; src low limb
|
|
mov [VAR_JUMP],edx
|
|
lea esi,[VAL1+4+esi+ecx*4]
|
|
mul ebp
|
|
add eax,ebx ; initial carry (from _1c)
|
|
adc edx,0
|
|
mov ebx,edx ; high carry
|
|
lea edi,[VAL1+edi+ecx*4]
|
|
mov edx,[VAR_JUMP]
|
|
test ecx,1
|
|
mov ecx,eax ; low carry
|
|
cmovnz ecx,ebx
|
|
cmovnz ebx,eax
|
|
jmp edx
|
|
|
|
; eax scratch
|
|
; ebx carry hi
|
|
; ecx carry lo
|
|
; edx scratch
|
|
; esi src
|
|
; edi dst
|
|
; ebp multiplier
|
|
;
|
|
; VAR_COUNTER loop counter
|
|
;
|
|
; 15 code bytes per limb
|
|
|
|
%define CHUNK_COUNT 2
|
|
|
|
align 32
|
|
%%Ltop:
|
|
add edi,UNROLL_BYTES
|
|
%%Lentry:
|
|
%assign disp VAL2
|
|
%rep UNROLL_COUNT/CHUNK_COUNT
|
|
mov eax,[byte disp+esi]
|
|
mul ebp
|
|
%2 [byte disp+edi],ecx
|
|
adc ebx,eax
|
|
mov ecx,edx
|
|
adc ecx,0
|
|
mov eax,[byte disp+4+esi]
|
|
mul ebp
|
|
%2 [byte disp+4+edi],ebx
|
|
adc ecx,eax
|
|
mov ebx,edx
|
|
adc ebx,0
|
|
%assign disp disp+4*CHUNK_COUNT
|
|
%endrep
|
|
|
|
dec dword [VAR_COUNTER]
|
|
lea esi,[UNROLL_BYTES+esi]
|
|
jns %%Ltop
|
|
|
|
%assign disp UNROLL_BYTES+VAL2
|
|
%2 [disp+edi],ecx
|
|
mov eax,ebx
|
|
pop ebp
|
|
pop edi
|
|
pop esi
|
|
pop ebx
|
|
adc eax,0
|
|
ret
|
|
%endmacro
|
|
|
|
section .text
|
|
global ___gmpn_submul_1
|
|
global ___gmpn_submul_1c
|
|
|
|
mul_fun ___g,sub,mpn_submul_1,mpn_submul_1c
|
|
|
|
end
|