mpir/mpn/x86_64/amd64/lshift1.asm

dnl  AMD64 mpn_lshift1

dnl  Copyright 2008 Jason Moxham

dnl  This file is part of the MPIR Library.

dnl  The MPIR Library is free software; you can redistribute it and/or modify
dnl  it under the terms of the GNU Lesser General Public License as published
dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
dnl  your option) any later version.

dnl  The MPIR Library is distributed in the hope that it will be useful, but
dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
dnl  License for more details.

dnl  You should have received a copy of the GNU Lesser General Public License
dnl  along with the MPIR Library; see the file COPYING.LIB.  If not, write
dnl  to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
dnl  Boston, MA 02110-1301, USA.

include(`../config.m4')

C	(rdi,rdx)=(rsi,rdx)<<1
C	rax=carry

ASM_START()
PROLOGUE(mpn_lshift1)
xor     %rax,%rax
mov     %rdx,%r11
and     $7,%r11
inc     %r11
shr     $3,%rdx
C and clear carry flag
cmp     $0,%rdx
jz      next
ALIGN(16)
loop:
	mov	(%rsi),%rcx
	mov	8(%rsi),%r8
	mov	16(%rsi),%r10
	mov	24(%rsi),%r9
	adc	%rcx,%rcx
	adc	%r8,%r8
	adc	%r10,%r10
	adc	%r9,%r9
	mov	%rcx,(%rdi)
	mov	%r8,8(%rdi)
	mov	%r10,16(%rdi)
	mov	%r9,24(%rdi)

	mov	32(%rsi),%rcx
	mov	40(%rsi),%r8
	mov	48(%rsi),%r10
	mov	56(%rsi),%r9
	adc	%rcx,%rcx
	adc	%r8,%r8
	adc	%r10,%r10
	adc	%r9,%r9
	mov	%rcx,32(%rdi)
	mov	%r8,40(%rdi)
	mov	%r10,48(%rdi)
	mov	%r9,56(%rdi)

	lea	64(%rdi),%rdi
	dec	%rdx
	lea	64(%rsi),%rsi
	jnz	loop
next:
dec     %r11
jz      end
C Could still have cache-bank conflicts in this tail part
        mov     (%rsi),%rcx
        adc     %rcx,%rcx
        mov     %rcx,(%rdi)
        dec     %r11
        jz end
        mov     8(%rsi),%rcx
        adc     %rcx,%rcx
        mov     %rcx,8(%rdi)
        dec     %r11
        jz end        
	mov     16(%rsi),%rcx
        adc     %rcx,%rcx
        mov     %rcx,16(%rdi)
        dec     %r11
        jz end
        mov     24(%rsi),%rcx
        adc     %rcx,%rcx
        mov     %rcx,24(%rdi)
        dec     %r11
        jz end
        mov     32(%rsi),%rcx
        adc     %rcx,%rcx
        mov     %rcx,32(%rdi)
        dec     %r11
        jz end
        mov     40(%rsi),%rcx
        adc     %rcx,%rcx
        mov     %rcx,40(%rdi)
        dec     %r11
        jz end
        mov     48(%rsi),%rcx
        adc     %rcx,%rcx
        mov     %rcx,48(%rdi)
end:
adc     %rax,%rax
ret
EPILOGUE()