2008-06-25 03:33:36 -04:00
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; Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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;
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; This file is part of the GNU MP Library.
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;
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; The GNU MP Library is free software; you can redistribute it and/or
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; modify it under the terms of the GNU Lesser General Public License as
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; published by the Free Software Foundation; either version 2.1 of the
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; License, or (at your option) any later version.
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;
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; The GNU MP Library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; Lesser General Public License for more details.
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;
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; You should have received a copy of the GNU Lesser General Public
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; License along with the GNU MP Library; see the file COPYING.LIB. If
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; not, write to the Free Software Foundation, Inc., 59 Temple Place -
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; Suite 330, Boston, MA 02111-1307, USA.
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;
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; Adapted by Brian Gladman AMD64 using the Microsoft VC++ v8 64-bit
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; compiler and the YASM assembler.
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; AMD64 mpn_mul_basecase -- multiply two mpn numbers.
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;
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; Calling interface:
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;
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; void __gmpn_mul_basecase(
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; mp_ptr rp, rcx
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; mp_srcptr xp, rdx
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; mp_size_t xn, r8
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; mp_srcptr yp, r9
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; mp_size_t yn [rsp+0x28] as a *** 32-bit *** word
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; )
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;
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; Multiply xp[xn] by yp[yn] and write the result to rp[un+vn] with xn >= yn on
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; entry.
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;
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; This is an SEH Frame Function with a leaf prologue
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%include "..\x86_64_asm.inc"
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%define reg_save_list rbx, rsi, rdi, rbp, r12
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%define UNROLL_LOG2 4
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%define UNROLL_COUNT (1 << UNROLL_LOG2)
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%define UNROLL_MASK (UNROLL_COUNT - 1)
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%define UNROLL_BYTES (8 * UNROLL_COUNT)
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%define UNROLL_THRESHOLD 5
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bits 64
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section .text
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%define v_par 16
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%define v_adj 8
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%define v_xlo 0
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%define v_len 24
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%define r_ptr rcx
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%define x_ptr r11
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%define x_len r8
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%define y_ptr r9
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%define y_len r10
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%define v_ctr r8 ; x_len reused
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%define v_jmp r11 ; x_ptr reused
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global __gmpn_mul_basecase
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%ifdef DLL
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export __gmpn_mul_basecase
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%endif
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__gmpn_mul_basecase:
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movsxd x_len,r8d
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mov rax,[y_ptr]
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cmp x_len,2
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ja mul_m_by_n
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je mul_2_by_n
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mul qword [rdx]
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mov [r_ptr],rax
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mov [r_ptr+8],rdx
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ret
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mul_2_by_n:
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movsxd r10,dword[rsp+0x28] ; load as a 32-bit integer
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mov x_ptr,rdx
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dec qword y_len
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jnz mul_2_by_2
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mov r8,rax ; y[0] -> r8 (was x_len)
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mov rax,[x_ptr]
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mul r8
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mov [r_ptr],rax
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mov rax,[x_ptr+8]
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mov r9,rdx ; carry -> r9 (was y_ptr)
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mul r8
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add r9,rax
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mov [r_ptr+8],r9
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adc rdx,y_len ; note: r10 = 0 (was y_len)
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mov [r_ptr+16],rdx
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ret
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mul_2_by_2: ; r8 (x_len) and r10 (y_len) free
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mov r10,[x_ptr] ; x[0]
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mul r10 ; y[0] * x[0]
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mov [r_ptr],rax
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mov r8,rdx ; cry = { 0, r8 }
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mov rax,[y_ptr+8] ; y[1]
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mul r10 ; y[1] * x[0]
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add r8,rax
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adc rdx,byte 0
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mov r10,[x_ptr+8] ; x[1] - r11 (x_ptr) now free
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mov r11,rdx ; cry = { r11, r8 }
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mov rax,[y_ptr] ; y[0]
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mul r10 ; y[0] * x[1]
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add r8,rax
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adc r11,rdx
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mov [r_ptr+8],r8
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mov r8,dword 0
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adc r8,r8 ; cry = { r8, r11 }
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mov rax,[y_ptr+8] ; y[1]
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mul r10 ; x[1] * y[1]
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add rax,r11
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adc rdx,r8
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mov [r_ptr+16],rax
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mov [r_ptr+24],rdx
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ret
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; do first multiply of y[0] * x[n] as it can simply be stored
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mul_m_by_n:
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mov r10d, dword[rsp+0x28] ; load as a 32-bit integer
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prologue fmul_m_by_n, reg_save_list, 3
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mov x_ptr,rdx
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mov r12,x_len
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mov rbp,rax ; y[0] -> rbp
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xor rbx,rbx ; for carry
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lea rsi,[x_ptr+r12*8] ; past end of x[]
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lea rdi,[r_ptr+r12*8] ; past end of r[]
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neg r12
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.0: mov rax,[rsi+r12*8] ; x[n]
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mul rbp ; x[n] * y[0]
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add rax,rbx ; add carry from previous round
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mov [rdi+r12*8],rax ; store r[n]
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mov rbx,dword 0 ; propagate carry
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adc rbx,rdx
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inc r12 ; next iteration
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jnz .0
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mov [rdi],rbx ; store final digit in carry
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mov rdx,y_len ; done if y_len is 1
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dec rdx
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jnz .1 ; more to do
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jmp L_exit
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.1: cmp x_len,UNROLL_THRESHOLD ; unroll if many loops
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jae L_unroll
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lea y_ptr,[y_ptr+rdx*8+8] ; pointer to end limb of y[]
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neg x_len ; negative counter for x[n]
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neg rdx ; negative counter for y[n]
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mov rax,[rsi+x_len*8] ; x[0] -> rax
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mov y_len,rdx ; now -(y_len - 1)
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inc x_len ; negative counter for x[1]
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xor rbx,rbx ; for carry
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mov rcx,x_len ; now -(x_len - 1) -> rcx (was r_ptr)
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mov rbp,[y_ptr+rdx*8] ; y[n] -> rbp
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jmp .3
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.2: mov rcx,x_len ; restore x[] counter
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xor rbx,rbx ; clear carry
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add rdi,8 ; increase end of r[] pointer
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mov rbp,[y_ptr+y_len*8] ; y[n] -> rbp
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mov rax,[rsi+rcx*8-8] ; x[m] -> rax
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.3: mul rbp ; x[m] * y[n]
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add rbx,rax ; add carry
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adc rdx,byte 0
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add [rdi+rcx*8],rbx ; add into r[]
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mov rax,[rsi+rcx*8] ; next x[m] ->rax
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adc rdx,byte 0 ; add carry to rdx
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inc rcx ; got to next limb of x[]
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mov rbx,rdx ; move carry into rbx
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jnz .3 ; got to next limb of x[]
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mul rbp ; do last limb
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add rbx,rax ; propagate carry
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adc rdx,byte 0
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add [rdi],rbx ; add into r[]
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adc rdx,byte 0 ; add add in any carry
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inc y_len
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mov [rdi+8],rdx ; move (not add) carry into r[]
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jnz .2 ; go to next limb of y[]
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jmp L_exit
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L_unroll:
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mov rdi,r_ptr
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mov rcx,x_len
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mov rsi,x_ptr
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mov rbp,[y_ptr+8]
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lea y_ptr,[y_ptr+rdx*8+8]
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neg rdx
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mov y_len,rdx
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lea rbx,[UNROLL_COUNT-2+rcx]
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dec rcx
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mov rax,[rsi] ; x[0]
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and rbx,-UNROLL_MASK-1
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neg rcx
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neg rbx
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and rcx,UNROLL_MASK
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mov [rsp+v_par],rcx
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mov [rsp+v_adj],rbx
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mov rdx,rcx
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shl rcx,3
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lea rcx,[rcx+rcx*2]
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lea v_jmp,[rel .4]
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lea v_jmp,[v_jmp+rcx]
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neg rdx
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mov [rsp+v_xlo],rax
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lea rdi,[rdi+rdx*8+8]
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lea rsi,[rsi+rdx*8+8]
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jmp .3
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.2: mov rbx,[rsp+v_adj]
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mov rax,[rsp+v_xlo]
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lea rdi,[rdi+rbx*8+8]
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lea rsi,[rsi+rbx*8]
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mov rbp,[y_ptr+y_len*8]
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.3: mul rbp
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sar rbx,UNROLL_LOG2
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mov rcx,[rsp+v_par]
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mov v_ctr,rbx
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test cl,1 ; low word of product + carry
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mov rbx,dword 0 ; is in rcx on even rounds and
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mov rcx,dword 0 ; rbx on odd rounds - we must
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cmovz rcx,rax ; put low word of first product
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cmovnz rbx,rax ; in the right register here
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jmp v_jmp
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.4:
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%define CHUNK_COUNT 2
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%assign i 0
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%rep UNROLL_COUNT / CHUNK_COUNT
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%define disp0 8 * i * CHUNK_COUNT
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mov rax,[byte rsi+disp0]
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adc rbx,rdx
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mul rbp
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add [byte rdi+disp0],rcx
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mov rcx,dword 0
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adc rbx,rax
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mov rax,[byte rsi+disp0+8]
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adc rcx,rdx
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mul rbp
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add [byte rdi+disp0+8],rbx
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mov rbx,dword 0
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adc rcx,rax
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%assign i i + 1
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%endrep
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inc v_ctr
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lea rsi,[UNROLL_BYTES+rsi]
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lea rdi,[UNROLL_BYTES+rdi]
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jnz .4
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adc rdx,byte 0
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add [rdi],rcx
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adc rdx,byte 0
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inc y_len
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mov [rdi+8],rdx
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jnz .2
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L_exit:
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epilogue reg_save_list, 3
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end
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